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153-522: Kambara is an extinct genus of mekosuchine crocodylian that lived during the Eocene epoch in Australia . It is generally thought to have been a semi-aquatic generalist, living a lifestyle similar to many of today's crocodiles. Four species are currently recognised, the sympatric Kambara murgonensis and Kambara implexidens from sediments near Murgon , the poorly preserved Kambara molnari from
306-459: A doctoral degree are called theses or dissertations . At French-language universities, for the fulfillment of a master's degree, students can present a " mémoire "' or a shorter " essai "' (the latter requires the student to take more courses). For the fulfillment of a doctoral degree, they may present a "thèse" or an "essai doctoral" (here too, the latter requires more courses). All these documents are usually synthetic monograph related to
459-438: A food chain who lose their prey. "Species coextinction is a manifestation of one of the interconnectednesses of organisms in complex ecosystems ... While coextinction may not be the most important cause of species extinctions, it is certainly an insidious one." Coextinction is especially common when a keystone species goes extinct. Models suggest that coextinction is the most common form of biodiversity loss . There may be
612-669: A nautilus to the Royal Society that was more than two feet in diameter, and morphologically distinct from any known living species. Hooke theorized that this was simply because the species lived in the deep ocean and no one had discovered them yet. While he contended that it was possible a species could be "lost", he thought this highly unlikely. Similarly, in 1695, Sir Thomas Molyneux published an account of enormous antlers found in Ireland that did not belong to any extant taxa in that area. Molyneux reasoned that they came from
765-1139: A polytomy . For instance, a 2018 study by Lee and Yates, using genetic, morphological and stratigraphic data, found Kambara to be second only to Australosuchus , whereas Ristevski et al. alternatively found Australosuchus , Kalthifrons or Kalthifrons and Kambara to be the basalmost forms. In both cases, Kambara was found to be a mekosuchine. Australosuchus † Kambara taraina † Kambara implexidens † Kambara murgonensis † Kalthifrons † Pallimnarchus † Baru wickeni † Baru darrowi † Baru Alcoota † Bullock Creek taxon † "Baru" huberi † Volia † Mekosuchus † Trilophosuchus † Quinkana † Longirostres "Crocodylus" megarhinus † Kalthifrons aurivellensis † Kambara implexidens † Kambara taraina † Kambara murgonensis † Australosuchus clarkae † "Baru" huberi † Trilophosuchus rackhami † Volia athollandersoni † Mekosuchus whitehunterensis † Mekosuchus sanderi † Extinct Extinction
918-415: A species or a population is the variety of genetic information in its living members. A large gene pool (extensive genetic diversity ) is associated with robust populations that can survive bouts of intense selection . Meanwhile, low genetic diversity (see inbreeding and population bottlenecks ) reduces the range of adaptions possible. Replacing native with alien genes narrows genetic diversity within
1071-436: A viable population for species preservation and possible future reintroduction to the wild, through use of carefully planned breeding programs . The extinction of one species' wild population can have knock-on effects, causing further extinctions. These are also called "chains of extinction". This is especially common with extinction of keystone species . A 2018 study indicated that the sixth mass extinction started in
1224-420: A 4-year bachelor's degree is sometimes called a major paper . High-quality research papers presented as the empirical study of a "postgraduate" consecutive bachelor with Honours or Baccalaureatus Cum Honore degree are called thesis (Honours Seminar Thesis). Major papers presented as the final project for a master's degree are normally called thesis ; and major papers presenting the student's research towards
1377-479: A Lazarus species when extant individuals were described in 2019. Attenborough's long-beaked echidna ( Zaglossus attenboroughi ) is an example of a Lazarus species from Papua New Guinea that had last been sighted in 1962 and believed to be possibly extinct, until it was recorded again in November 2023. Some species currently thought to be extinct have had continued speculation that they may still exist, and in
1530-503: A cascade of coextinction across the trophic levels . Such effects are most severe in mutualistic and parasitic relationships. An example of coextinction is the Haast's eagle and the moa : the Haast's eagle was a predator that became extinct because its food source became extinct. The moa were several species of flightless birds that were a food source for the Haast's eagle. Extinction as
1683-592: A cognate is used for part of a bachelor's or master's course, while dissertation is normally applied to a doctorate . This is the typical arrangement in American English . In other contexts, such as within most institutions of the United Kingdom and Republic of Ireland , the reverse is true. The term graduate thesis is sometimes used to refer to both master's theses and doctoral dissertations. The required complexity or quality of research of
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#17328018803741836-696: A committee and gaining their approval. Most of the norms and rules of writing a thesis or a dissertation are influenced by the French higher education system. In Italy there are normally three types of thesis. In order of complexity: one for the Laurea (equivalent to the UK Bachelor's Degree), another one for the Laurea Magistrale (equivalent to the UK Master's Degree) and then a thesis to complete
1989-429: A common ancestor with modern horses. Pseudoextinction is much easier to demonstrate for larger taxonomic groups. A Lazarus taxon or Lazarus species refers to instances where a species or taxon was thought to be extinct, but was later rediscovered. It can also refer to instances where large gaps in the fossil record of a taxon result in fossils reappearing much later, although the taxon may have ultimately become extinct at
2142-467: A comprehensive collection of Canadian theses at Library and Archives Canada (LAC) through a partnership with Canadian universities who participate in the program. Most theses can also be found in the institutional repository of the university the student graduated from. At most university faculties in Croatia, a degree is obtained by defending a thesis after having passed all the classes specified in
2295-445: A copy of the dissertation will become a permanent part of the library collection), paper size , order of components, and citation style, will be checked page by page by the accepting officer before the thesis is accepted and a receipt is issued. However, strict standards are not always required. Most Italian universities, for example, have only general requirements on the character size and the page formatting, and leave much freedom for
2448-428: A curated collection of articles . An ordinary monograph has a title page , an abstract , a table of contents , comprising the various chapters like introduction, literature review, methodology, results, discussion, and bibliography or more usually a references section. They differ in their structure in accordance with the many different areas of study (arts, humanities, social sciences, technology, sciences, etc.) and
2601-522: A doctoral degree paper ( doktorska disertacija ). In the Czech Republic, higher education is completed by passing all classes remaining to the educational compendium for given degree and defending a thesis. For bachelors programme the thesis is called bakalářská práce (bachelor's thesis), for master's degrees and also doctor of medicine or dentistry degrees it is the diplomová práce (master's thesis), and for Philosophiae doctor (PhD.) degree it
2754-409: A document continuously from the first page, independent of any printed page numbers. They, therefore, avoid the traditional separate number sequence for front matter and require a single sequence of Arabic numerals starting with 1 for the first printed page (the recto of the title page). Presentation requirements, including pagination, layout, type and color of paper, use of acid-free paper (where
2907-399: A fact that was accepted by most scientists. The primary debate focused on whether this turnover caused by extinction was gradual or abrupt in nature. Cuvier understood extinction to be the result of cataclysmic events that wipe out huge numbers of species, as opposed to the gradual decline of a species over time. His catastrophic view of the nature of extinction garnered him many opponents in
3060-426: A fashion much more similar to what is observed in species of Crocodylus . In K. implexidens , the first teeth of the lower jaw slide into very pronounced pits that pierce the bones of the upper jaw, emerging on its upper surface in front of the nostrils. The remaining premaxillary and maxillary teeth of K. implexidens clearly interlock with each other based on the presence of the aforementioned occlusal pits between
3213-524: A few universities follow the United States model for theses and dissertations. Some public universities have both British and US style PhD programs. Branch campuses of British, Australian and Middle East universities in Malaysia use the respective models of the home campuses. In Pakistan, at undergraduate level the thesis is usually called final year project, as it is completed in the senior year of
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#17328018803743366-459: A high degree of variation among its fossils, in particular regarding the better preserved lower jaws. For this reason, it was suggested that the fossils could belong to multiple species of a single genus. This was confirmed when a second species, Kambara implexidens , was named three years later on the basis of new material collected from the same locality, with some of the previously recovered fossils now being assigned to this taxon. A third species
3519-708: A higher risk of extinction and die out faster than less sexually dimorphic species, the least sexually dimorphic species surviving for millions of years while the most sexually dimorphic species die out within mere thousands of years. Earlier studies based on counting the number of currently living species in modern taxa have shown a higher number of species in more sexually dimorphic taxa which have been interpreted as higher survival in taxa with more sexual selection, but such studies of modern species only measure indirect effects of extinction and are subject to error sources such as dying and doomed taxa speciating more due to splitting of habitat ranges into more small isolated groups during
3672-405: A large range, a lack of individuals of both sexes (in sexually reproducing species), or other reasons. Pinpointing the extinction (or pseudoextinction ) of a species requires a clear definition of that species . If it is to be declared extinct, the species in question must be uniquely distinguishable from any ancestor or daughter species, and from any other closely related species. Extinction of
3825-607: A later point. The coelacanth , a fish related to lungfish and tetrapods , is an example of a Lazarus taxon that was known only from the fossil record and was considered to have been extinct since the end of the Cretaceous Period . In 1938, however, a living specimen was found off the Chalumna River (now Tyolomnqa) on the east coast of South Africa. Calliostoma bullatum , a species of deepwater sea snail originally described from fossils in 1844 proved to be
3978-594: A mathematical model that falls in all positions. By contrast, conservation biology uses the extinction vortex model to classify extinctions by cause. When concerns about human extinction have been raised, for example in Sir Martin Rees ' 2003 book Our Final Hour , those concerns lie with the effects of climate change or technological disaster. Human-driven extinction started as humans migrated out of Africa more than 60,000 years ago. Currently, environmental groups and some governments are concerned with
4131-456: A natural part of the evolutionary process. Only recently have extinctions been recorded and scientists have become alarmed at the current high rate of extinctions . Most species that become extinct are never scientifically documented. Some scientists estimate that up to half of presently existing plant and animal species may become extinct by 2100. A 2018 report indicated that the phylogenetic diversity of 300 mammalian species erased during
4284-441: A new mega-predator or by transporting animals and plants from one part of the world to another. Such introductions have been occurring for thousands of years, sometimes intentionally (e.g. livestock released by sailors on islands as a future source of food) and sometimes accidentally (e.g. rats escaping from boats). In most cases, the introductions are unsuccessful, but when an invasive alien species does become established,
4437-610: A population a higher chance in the short term of surviving an adverse change in conditions. Effects that cause or reward a loss in genetic diversity can increase the chances of extinction of a species. Population bottlenecks can dramatically reduce genetic diversity by severely limiting the number of reproducing individuals and make inbreeding more frequent. Extinction sometimes results for species evolved to specific ecologies that are subjected to genetic pollution —i.e., uncontrolled hybridization , introgression and genetic swamping that lead to homogenization or out-competition from
4590-407: A race of animals to become extinct. A series of fossils were discovered in the late 17th century that appeared unlike any living species. As a result, the scientific community embarked on a voyage of creative rationalization, seeking to understand what had happened to these species within a framework that did not account for total extinction. In October 1686, Robert Hooke presented an impression of
4743-502: A reduction in agricultural productivity. Furthermore, increased erosion contributes to poorer water quality by elevating the levels of sediment and pollutants in rivers and streams. Habitat degradation through toxicity can kill off a species very rapidly, by killing all living members through contamination or sterilizing them. It can also occur over longer periods at lower toxicity levels by affecting life span, reproductive capacity, or competitiveness. Habitat degradation can also take
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4896-499: A result of climate change has been confirmed by fossil studies. Particularly, the extinction of amphibians during the Carboniferous Rainforest Collapse , 305 million years ago. A 2003 review across 14 biodiversity research centers predicted that, because of climate change, 15–37% of land species would be "committed to extinction" by 2050. The ecologically rich areas that would potentially suffer
5049-453: A rostrum that begins relatively narrow and continues to widen towards the back. The precise degree to which the snout tapers differs between species. K. murgonensis for instance is described as being moderately broad-snouted with a robust build. By comparison, the skull of K. implexidens , although still platyrostral, is notably slender compared to its contemporary relative. Similarly, the teeth are also more slender. The skull table of Kambara
5202-479: A species (or replacement by a daughter species) plays a key role in the punctuated equilibrium hypothesis of Stephen Jay Gould and Niles Eldredge . In ecology , extinction is sometimes used informally to refer to local extinction , in which a species ceases to exist in the chosen area of study, despite still existing elsewhere. Local extinctions may be made good by the reintroduction of individuals of that species taken from other locations; wolf reintroduction
5355-439: A species may come suddenly when an otherwise healthy species is wiped out completely, as when toxic pollution renders its entire habitat unliveable; or may occur gradually over thousands or millions of years, such as when a species gradually loses out in competition for food to better adapted competitors. Extinction may occur a long time after the events that set it in motion, a phenomenon known as extinction debt . Assessing
5508-404: A species or group of species. "Just as each species is unique", write Beverly and Stephen C. Stearns , "so is each extinction ... the causes for each are varied—some subtle and complex, others obvious and simple". Most simply, any species that cannot survive and reproduce in its environment and cannot move to a new environment where it can do so, dies out and becomes extinct. Extinction of
5661-471: A step further by including Mekosuchus in this group and redefining Mekosuchidae as Mekosuchinae. No detailed phylogenetic analysis was conducted for Kambara murgonensis in 1993, but it was still recognised as the basalmost member of Mekosuchinae. Subsequent papers largely supported this suggestion, typically recovering Kambara as one of the earliest branching mekosuchines, although other taxa may be found as slightly more basal or on an even level as part of
5814-559: A student is required to write a thesis and to then defend the work publicly. The length of this manuscript usually is given in page count and depends upon educational institution, its departments, faculties, and fields of study At universities in Slovenia, an academic thesis called diploma thesis is a prerequisite for completing undergraduate studies. The thesis used to be 40–60 pages long, but has been reduced to 20–30 pages in new Bologna process programmes. To complete Master's studies,
5967-518: A subsequent report, IPBES listed unsustainable fishing, hunting and logging as being some of the primary drivers of the global extinction crisis. In June 2019, one million species of plants and animals were at risk of extinction. At least 571 plant species have been lost since 1750, but likely many more. The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming. A dagger symbol (†) placed next to
6120-447: A thesis of 9 credits, at least one publication is normally considered enough for the awarding of the degree with project and is considered mandatory for the awarding of a degree with thesis. A written report and a public thesis defense is mandatory, in the presence of a board of senior researchers, consisting of members from an outside organization or a university. A PhD candidate is supposed to accomplish extensive research work to fulfill
6273-571: A thesis or dissertation can vary by country, university, or program, and the required minimum study period may thus vary significantly in duration. The word dissertation can at times be used to describe a treatise without relation to obtaining an academic degree. The term thesis is also used to refer to the general claim of an essay or similar work. The term thesis comes from the Greek word θέσις , meaning "something put forth", and refers to an intellectual proposition . Dissertation comes from
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6426-407: A thesis. This project is mostly given as a prerequisite writing course to the actual thesis and is accomplished in the term period before; supervision is provided by one professor assigned to a class. This project is later to be presented in front of an academic panel, often the entire faculty of an academic department, with their recommendations contributing to the acceptance, revision, or rejection of
6579-413: A university (with a Masters or PhD degree) depending on the university's examination rules. Required word length, complexity, and contribution to scholarship varies widely across universities in the country. In Poland, a bachelor's degree usually requires a praca licencjacka (bachelor's thesis) or the similar level degree in engineering requires a praca inżynierska (engineer's thesis/bachelor's thesis),
6732-452: Is a statement or opinion that may or may not be true depending on the evidence and/or proof that is offered (152b32). The purpose of the dissertation is thus to outline the proofs of why the author disagrees with other philosophers or the general opinion. A thesis (or dissertation) may be arranged as a thesis by publication or a monograph , with or without appended papers, respectively, though many graduate programs allow candidates to submit
6885-416: Is accomplished in the last term alone and is defended once. In most universities, a thesis is required for the bestowment of a degree to a candidate alongside a number of units earned throughout their academic period of stay, though for practice and skills-based degrees a practicum and a written report can be achieved instead. The examination board often consists of three to five examiners, often professors in
7038-523: Is also evidence to suggest that this event was preceded by another mass extinction, known as Olson's Extinction . The Cretaceous–Paleogene extinction event (K–Pg) occurred 66 million years ago, at the end of the Cretaceous period; it is best known for having wiped out non-avian dinosaurs , among many other species. According to a 1998 survey of 400 biologists conducted by New York 's American Museum of Natural History , nearly 70% believed that
7191-444: Is an example of this. Species that are not globally extinct are termed extant . Those species that are extant, yet are threatened with extinction, are referred to as threatened or endangered species . Currently, an important aspect of extinction is human attempts to preserve critically endangered species. These are reflected by the creation of the conservation status "extinct in the wild" (EW) . Species listed under this status by
7344-505: Is called a soutenance . Since 2023, at the end of the admission process, the doctoral student takes an oath of commitment to the principles of scientific integrity In the presence of my peers. With the completion of my doctorate in [research field], in my quest for knowledge, I have carried out demanding research, demonstrated intellectual rigour, ethical reflection, and respect for the principles of research integrity. As I pursue my professional career, whatever my chosen field, I pledge, to
7497-404: Is characterised by being interlocking. The third type is observed in K. molnari , which shows a somewhat intermediate condition between the overbite of K. murgonensis and the more extensive interlocking dentition of K. implexidens . Around the seventh and eight dentary teeth, as well as from the twelfth to seventeenth, the teeth appear to have interlocked. However, the tenth to twelfth teeth of
7650-585: Is difficult to demonstrate unless one has a strong chain of evidence linking a living species to members of a pre-existing species. For example, it is sometimes claimed that the extinct Hyracotherium , which was an early horse that shares a common ancestor with the modern horse , is pseudoextinct, rather than extinct, because there are several extant species of Equus , including zebra and donkey ; however, as fossil species typically leave no genetic material behind, one cannot say whether Hyracotherium evolved into more modern horse species or merely evolved from
7803-590: Is dissertation dizertační práce . Thesis for so called Higher-Professional School (Vyšší odborná škola, VOŠ) is called absolventská práce . The following types of thesis are used in Finland (names in Finnish/Swedish): In France, the academic dissertation or thesis is called a thèse and it is reserved for the final work of doctoral candidates. The minimum page length is generally (and not formally) 100 pages (or about 400,000 characters), but
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#17328018803747956-417: Is estimated as 100 to 1,000 times "background" rates (the average extinction rates in the evolutionary time scale of planet Earth), faster than at any other time in human history, while future rates are likely 10,000 times higher. However, some groups are going extinct much faster. Biologists Paul R. Ehrlich and Stuart Pimm , among others, contend that human population growth and overconsumption are
8109-412: Is mostly mandatory for the completion of a degree . Undergraduate students usually begin to write their final assignment in their third, fourth or fifth enrollment year, depends on the requirements of their respective disciplines and universities. In some universities, students are required to write a proposal skripsi or proposal tesis (thesis proposal) before they could write their final assignment. If
8262-454: Is much straighter, with both surfaces being level to each other. As a consequence, the shaft of the humerus in Kambara is not lengthened as is the case in modern Australian crocodiles. There are also differences concerning the distal end, the end towards the toes rather than the hip. Here, modern Australian crocodiles have flat medial and lateral surfaces bordering the condyles , which makes
8415-465: Is often earned with multiple levels of a Latin honors remark for the thesis ranging from summa cum laude (best) to rite (duly). A thesis can also be rejected with a Latin remark ( non-rite , non-sufficit or worst as sub omni canone ). Bachelor's and master's theses receive numerical grades from 1.0 (best) to 5.0 (failed). In India the thesis defense is called a viva voce ( Latin for "by live voice") examination ( viva in short). Involved in
8568-460: Is often given in page count and depends upon departments, faculties, and fields of study. A bachelor's thesis is often 40–60 pages long, a diploma thesis and a master's thesis usually 60–100. The required submission for a doctorate is called a Dissertation or Doktorarbeit . The submission for a Habilitation , which is an academic qualification, not an academic degree, is called Habilitationsschrift , not Habilitationsarbeit . A doctoral degree
8721-592: Is the destruction of ocean floors by bottom trawling . Diminished resources or introduction of new competitor species also often accompany habitat degradation. Global warming has allowed some species to expand their range, bringing competition to other species that previously occupied that area. Sometimes these new competitors are predators and directly affect prey species, while at other times they may merely outcompete vulnerable species for limited resources. Vital resources including water and food can also be limited during habitat degradation, leading to extinction. In
8874-525: Is the most important determinant of genus extinction at background rates but becomes increasingly irrelevant as mass extinction arises. Limited geographic range is a cause both of small population size and of greater vulnerability to local environmental catastrophes. Extinction rates can be affected not just by population size, but by any factor that affects evolvability , including balancing selection , cryptic genetic variation , phenotypic plasticity , and robustness . A diverse or deep gene pool gives
9027-457: Is the termination of a taxon by the death of its last member . A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa , where a species presumed extinct abruptly "reappears" (typically in
9180-440: Is unknown for K. molnari , while both K. implexidens and K. murgonensis possess 16 teeth in either maxilla. The lower jaw contains 17 or 18 dentary teeth. Although a lot of postcranial material of Kambara has been found, most of said material remains undescribed with the exception of the humerus , which had been studied and compared to the equivalent bones in saltwater and freshwater crocodiles. In both of these modern forms,
9333-410: Is usually several times longer (except for technical theses and for "exact sciences" such as physics and maths). To complete a master's degree in research, a student is required to write a mémoire , the French equivalent of a master's thesis in other higher education systems. The word dissertation in French is reserved for shorter (1,000–2,000 words), more generic academic treatises. The defense
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#17328018803749486-483: The International Union for Conservation of Nature (IUCN) are not known to have any living specimens in the wild and are maintained only in zoos or other artificial environments. Some of these species are functionally extinct, as they are no longer part of their natural habitat and it is unlikely the species will ever be restored to the wild. When possible, modern zoological institutions try to maintain
9639-485: The Late Pleistocene could take up to 5 to 7 million years to restore mammal diversity to what it was before the human era. Extinction of a parent species where daughter species or subspecies are still extant is called pseudoextinction or phyletic extinction. Effectively, the old taxon vanishes, transformed ( anagenesis ) into a successor, or split into more than one ( cladogenesis ). Pseudoextinction
9792-560: The Latin dissertātiō , meaning "discussion". Aristotle was the first philosopher to define the term thesis. A 'thesis' is a supposition of some eminent philosopher that conflicts with the general opinion...for to take notice when any ordinary person expresses views contrary to men's usual opinions would be silly. For Aristotle, a thesis would therefore be a supposition that is stated in contradiction with general opinion or express disagreement with other philosophers (104b33-35). A supposition
9945-755: The Rundle Formation and the youngest of the four, Kambara taraina , also from the Rundle Formation. Kambara were medium-sized crocodilians, with mature specimens generally reaching lengths from 3–4 m (9.8–13.1 ft). Species of Kambara are easiest differentiated by the different occlusal patterns of their teeth. While K. murgonensis had an overbite similar to a modern alligator , both K. implexidens and K. taraina had interlocking dentition much more similar to true crocodiles . K. molnari , although incompletely known, seems to represent an intermediate form. Despite plentiful fossils,
10098-629: The fossil record ) after a period of apparent absence. More than 99% of all species that ever lived on Earth , amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, and possibly many times more if microorganisms , like bacteria , are included. Notable extinct animal species include non-avian dinosaurs , saber-toothed cats , dodos , mammoths , ground sloths , thylacines , trilobites , golden toads , passenger pigeons and Kauai O'os . Through evolution , species arise through
10251-468: The saltwater and freshwater crocodile . While this could suggest that it was faster on land than living crocodilians, it does not necessarily mean that it was terrestrial like some later mekosuchines are thought to have been. Another question regarding its ecology is posed by the coexistence of K. murgonensis and K. implexidens at Murgon. It is unclear how exactly these two species differed in their niche, but they did differ notably in their anatomy, with
10404-410: The slender-billed curlew ( Numenius tenuirostris ), not seen since 2007. As long as species have been evolving, species have been going extinct. It is estimated that over 99.9% of all species that ever lived are extinct. The average lifespan of a species is 1–10 million years, although this varies widely between taxa. A variety of causes can contribute directly or indirectly to the extinction of
10557-488: The strata of the Paris basin. They saw alternating saltwater and freshwater deposits, as well as patterns of the appearance and disappearance of fossils throughout the record. From these patterns, Cuvier inferred historic cycles of catastrophic flooding, extinction, and repopulation of the earth with new species. Cuvier's fossil evidence showed that very different life forms existed in the past than those that exist today,
10710-683: The viva are two examiners, one guide (student guide) and the candidate. One examiner is an academic from the candidate's own university department (but not one of the candidate's supervisors) and the other is an external examiner from a different university. In India, PG Qualifications such as MSc Physics accompanies submission of dissertation in Part I and submission of a Project (a working model of an innovation) in Part II. Engineering and Designing qualifications such as BTech, B.E., B.Des, MTech, M.E. or M.Des also involves submission of dissertation. In all
10863-639: The 20 biodiversity goals laid out by the Aichi Biodiversity Targets in 2010, only 6 were "partially achieved" by the deadline of 2020. The report warned that biodiversity will continue to decline if the status quo is not changed, in particular the "currently unsustainable patterns of production and consumption, population growth and technological developments". In a 2021 report published in the journal Frontiers in Conservation Science , some top scientists asserted that even if
11016-451: The Aichi Biodiversity Targets set for 2020 had been achieved, it would not have resulted in a significant mitigation of biodiversity loss. They added that failure of the global community to reach these targets is hardly surprising given that biodiversity loss is "nowhere close to the top of any country's priorities, trailing far behind other concerns such as employment, healthcare, economic growth, or currency stability." For much of history,
11169-471: The Bachelor's Thesis is called TCC or Trabalho de Conclusão de Curso (Final Term / Undergraduate Thesis / Final Paper). In Russia, Belarus, and Ukraine an academic dissertation or thesis is called what can be literally translated as a "master's degree work" (thesis), whereas the word dissertation is reserved for doctoral theses ( Candidate of Sciences ). To complete both bachelor's and master's degree,
11322-511: The Dottorato di Ricerca (PhD). Thesis requirements vary greatly between degrees and disciplines, ranging from as low as 3–4 ECTS credits to more than 30. Thesis work is mandatory for the completion of a degree. In Kazakhstan, a bachelor's degree typically requires a bachelor's diploma work (kz "бакалаврдың дипломдық жұмысы"), while the master's and PhD degree require a master's/doctoral dissertation (kz "магистрлік/докторлық диссертация"). All
11475-618: The Earth is currently in the early stages of a human-caused mass extinction, known as the Holocene extinction . In that survey, the same proportion of respondents agreed with the prediction that up to 20% of all living populations could become extinct within 30 years (by 2028). A 2014 special edition of Science declared there is widespread consensus on the issue of human-driven mass species extinctions. A 2020 study published in PNAS stated that
11628-584: The North American moose and that the animal had once been common on the British Isles . Rather than suggest that this indicated the possibility of species going extinct, he argued that although organisms could become locally extinct, they could never be entirely lost and would continue to exist in some unknown region of the globe. The antlers were later confirmed to be from the extinct deer Megaloceros . Hooke and Molyneux's line of thinking
11781-522: The Paris basin, could be formed by a slow rise and fall of sea levels . The concept of extinction was integral to Charles Darwin 's On the Origin of Species , with less fit lineages disappearing over time. For Darwin, extinction was a constant side effect of competition . Because of the wide reach of On the Origin of Species , it was widely accepted that extinction occurred gradually and evenly (a concept now referred to as background extinction ). It
11934-482: The Rundle Formation, however, it was not sympatric with K. molnari , which stems from older stratigraphic layers. In the type description the name Kambara is stated to derive from an Aboriginal word for crocodile, however, it is not specified which language in particular, only that it stems from the Queensland language group. The skull of Kambara appears typically crocodilian, being roughly triangular with
12087-405: The United States government, to force the removal of Native Americans , many of whom relied on the bison for food. Thesis A thesis ( pl. : theses ), or dissertation (abbreviated diss. ), is a document submitted in support of candidature for an academic degree or professional qualification presenting the author's research and findings. In some contexts, the word thesis or
12240-429: The accumulation of slightly deleterious mutations , then a population will go extinct. Smaller populations have fewer beneficial mutations entering the population each generation, slowing adaptation. It is also easier for slightly deleterious mutations to fix in small populations; the resulting positive feedback loop between small population size and low fitness can cause mutational meltdown . Limited geographic range
12393-512: The actual typographic details. The thesis committee (or dissertation committee ) is a committee that supervises a student's dissertation. In the US, these committees usually consist of a primary supervisor or advisor and two or more committee members, who supervise the progress of the dissertation and may also act as the examining committee, or jury, at the oral examination of the thesis ( see § Thesis examinations ). At most universities,
12546-545: The advisor) or other experts with a PhD degree (generally at least half of them must be external to the university where the candidate defends the thesis, but it may depend on the university). Each university / faculty defines the length of these documents, and it can vary also in respect to the domains (a thesis in fields like philosophy, history, geography, etc., usually has more pages than a thesis in mathematics, computer science, statistics, etc.) but typical numbers of pages are around 60–80 for MSc and 150–250 for PhD. In Brazil
12699-468: The anatomy of the retroarticular process and the dentition. Regarding the retroarticular process, an important attachment site for the abductor musculature, K. taraina stands out as having a long, high and wide process, offering a greater surface area for the musculature to attach to. By comparison, the retroarticular processes in older species are less well developed, with that of K. molnari being described as long but narrow, while that of K. implexidens
12852-485: The body of the thesis . Correspondingly to the academic degree, the last phase of an academic thesis is called in Spanish a defensa de grado , defensa magistral or defensa doctoral in cases in which the university candidate is finalizing their licentiate , master's , or PhD program , respectively. According to a committee resolution, the dissertation can be approved or rejected by an academic committee consisting of
13005-427: The cases, the dissertation can be extended for summer internship at certain research and development organizations or also as PhD synopsis. In Indonesia , the term thesis is used specifically to refer to master's theses. The undergraduate thesis is called skripsi , while the doctoral dissertation is called disertasi . In general, those three terms are usually called as tugas akhir (final assignment), which
13158-416: The committee is chosen by the student in conjunction with their primary adviser, usually after completion of the comprehensive examinations or prospectus meeting, and may consist of members of the comps committee. The committee members are doctors in their field (whether a PhD or other designation) and have the task of reading the dissertation, making suggestions for changes and improvements, and sitting in on
13311-600: The consequences can be catastrophic. Invasive alien species can affect native species directly by eating them, competing with them, and introducing pathogens or parasites that sicken or kill them; or indirectly by destroying or degrading their habitat. Human populations may themselves act as invasive predators. According to the "overkill hypothesis", the swift extinction of the megafauna in areas such as Australia (40,000 years before present), North and South America (12,000 years before present), Madagascar , Hawaii (AD 300–1000), and New Zealand (AD 1300–1500), resulted from
13464-418: The contemporary extinction crisis "may be the most serious environmental threat to the persistence of civilization, because it is irreversible." Biologist E. O. Wilson estimated in 2002 that if current rates of human destruction of the biosphere continue, one-half of all plant and animal species of life on earth will be extinct in 100 years. More significantly, the current rate of global species extinctions
13617-439: The crest as a whole being just above the lateral margin of the shaft and the apex being directed ventrally. The right angle formed by the crest and shaft however remains. This is associated with the torsion of the shaft. In the modern forms, the humerus is given a sigmoid shape by the fact that the articulating surfaces, the parts of the bone that connect to the joints, are at an angle to each other. The humerus of Kambara meanwhile
13770-450: The defense. Sometimes, at least one member of the committee must be a professor in a department that is different from that of the student. The role of the thesis supervisor is to assist and support a student in their studies, and to determine whether a thesis is ready for examination. The thesis is authored by the student, not the supervisor. The duties of the thesis supervisor also include checking for copyright compliance and ensuring that
13923-462: The degree programme. In the Bologna system, the bachelor's thesis, called završni rad (literally "final work" or "concluding work") is defended after 3 years of study and is about 30 pages long. Most students with bachelor's degrees continue onto master's programmes which end with a master's thesis called diplomski rad (literally "diploma work" or "graduate work"). The term dissertation is used for
14076-454: The degree, the name project usually implies that the work carried out is less extensive than a thesis and bears lesser credit hours too. The undergraduate level project is presented through an elaborate written report and a presentation to the advisor, a board of faculty members and students. At graduate level however, i.e. in MS, some universities allow students to accomplish a project of 6 credits or
14229-476: The deliberate destruction of some species, such as dangerous viruses , and the total destruction of other problematic species has been suggested. Other species were deliberately driven to extinction, or nearly so, due to poaching or because they were "undesirable", or to push for other human agendas. One example was the near extinction of the American bison , which was nearly wiped out by mass hunts sanctioned by
14382-416: The deltopectoral crest is offset medially from the lateral margin of the shaft. The apex of the crest is also directed medially, which essentially places it just above the midline of the shaft. The deltapectoral crest sits at a right angle relative to the ventral face of the humeral shaft. However, in Kambara things are notably different. Neither the deltapectoral crest nor its apex are directed medially, with
14535-466: The dentary are confluent, meaning they are too closely spaced to interlock with those of the upper jaw, necessitating an overbite in this area. This clearly sets it apart from all other species of Kambara and more closely resembles animals such as Borealosuchus and Diplocynodon . All teeth are slightly compressed side to side and possess distinct carinae (cutting edges), but are not ziphodont like in some later mekosuchines. Both this compression and
14688-425: The development of the edges is strongest towards the front of the jaw and gradually grows weaker further back in the toothrow, while also becoming more bulbous and peg-like. While the number of premaxillary teeth is consistent, the amount of teeth in the maxilla and dentary varies. K. taraina has the lowest number of teeth in the maxillae (and thus throughout the upper jaw) with only 14 teeth on either side. The number
14841-406: The differences between them. In a thesis by publication, the chapters constitute an introductory and comprehensive review of the appended published and unpublished article documents. Dissertations normally report on a research project or study, or an extended analysis of a topic. The structure of a thesis or dissertation explains the purpose, the previous research literature impinging on the topic of
14994-404: The discovery of several additional crocodilian fossils, including a largely complete skull (QM F21115) collected in 1991. The genus Kambara , with K. murgonensis as the type species , was finally established in 1993 by Paul Willis , Ralph Molnar and John D. Scanlon, who tentatively referred all Murgon crocodile fossils to this taxon. Even at this time it was noted that Kambara seemingly showed
15147-565: The dissertation requirements with international publications being a mandatory requirement. The defense of the research work is done publicly. In the Philippines, an academic thesis is named by the degree, such as bachelor/undergraduate thesis or masteral thesis. However, in Philippine English , the term doctorate is typically replaced with doctoral (as in the case of "doctoral dissertation"), though in official documentation
15300-451: The ecology of Kambara is poorly understood. The general shape of the skull, which is flattened, and the environment the fossils were deposited in, all suggest that they were semi-aquatic ambush predators like modern crocodilians. However, subtle differences in the postcranial remains, especially the limb bones, suggest that Kambara may have been better adapted at walking on land than the two crocodile species still inhabiting Australia today,
15453-443: The end look somewhat quadrilateral. In Kambara , the dorsal and ventral faces are compressed, which in turn lengthens the medial and lateral condyles, while also directing these surfaces towards the midline. The profile of the distal end is subsequently hexagonal. Profile and size of the medial and lateral condyles in saltwater and freshwater crocodiles are nearly identical, but very different in Kambara . Additional known elements of
15606-403: The endangered wild water buffalo is most threatened with extinction by genetic pollution from the abundant domestic water buffalo ). Such extinctions are not always apparent from morphological (non-genetic) observations. Some degree of gene flow is a normal evolutionary process; nevertheless, hybridization (with or without introgression) threatens rare species' existence. The gene pool of
15759-591: The event of rediscovery would be considered Lazarus species. Examples include the thylacine , or Tasmanian tiger ( Thylacinus cynocephalus ), the last known example of which died in Hobart Zoo in Tasmania in 1936; the Japanese wolf ( Canis lupus hodophilax ), last sighted over 100 years ago; the American ivory-billed woodpecker ( Campephilus principalis ), with the last universally accepted sighting in 1944; and
15912-443: The extinction crisis. According to the International Union for Conservation of Nature (IUCN), 784 extinctions have been recorded since the year 1500, the arbitrary date selected to define "recent" extinctions, up to the year 2004; with many more likely to have gone unnoticed. Several species have also been listed as extinct since 2004. If adaptation increasing population fitness is slower than environmental degradation plus
16065-475: The extinction of species caused by humanity, and they try to prevent further extinctions through a variety of conservation programs. Humans can cause extinction of a species through overharvesting , pollution , habitat destruction , introduction of invasive species (such as new predators and food competitors ), overhunting, and other influences. Explosive, unsustainable human population growth and increasing per capita consumption are essential drivers of
16218-540: The field of zoology , and biology in general, and has also become an area of concern outside the scientific community. A number of organizations, such as the Worldwide Fund for Nature , have been created with the goal of preserving species from extinction. Governments have attempted, through enacting laws, to avoid habitat destruction, agricultural over-harvesting, and pollution . While many human-caused extinctions have been accidental, humans have also engaged in
16371-435: The form of a physical destruction of niche habitats. The widespread destruction of tropical rainforests and replacement with open pastureland is widely cited as an example of this; elimination of the dense forest eliminated the infrastructure needed by many species to survive. For example, a fern that depends on dense shade for protection from direct sunlight can no longer survive without forest to shelter it. Another example
16524-431: The former is still used. The terms thesis and dissertation are commonly used interchangeably in everyday language yet it is generally understood that a thesis refers to bachelor/undergraduate and master academic work while a dissertation is named for doctorate work. The Philippine system is influenced by American collegiate system, in that it requires a research project to be submitted before being allowed to write
16677-527: The given degree. Examinations for PhD and Habilitation degrees are public. In Portugal and Brazil, a dissertation ( dissertação ) is required for completion of a master's degree. The defense is done in a public presentation in which teachers, students, and the general public can participate. For the PhD, a thesis ( tese ) is presented for defense in a public exam. The exam typically extends over 3 hours. The examination board typically involves 5 to 6 scholars (including
16830-485: The greatest of my ability, to continue to maintain integrity in my relationship to knowledge, in my methods and in my results. In Germany, an academic thesis is called Abschlussarbeit or, more specifically, the basic name of the degree complemented by -arbeit (rough translation: -work ; e.g., Diplomarbeit , Masterarbeit , Doktorarbeit ). For bachelor's and master's degrees, the name can alternatively be complemented by -thesis instead (e.g., Bachelorthesis ). Length
16983-580: The habitat retreat of taxa approaching extinction. Possible causes of the higher extinction risk in species with more sexual selection shown by the comprehensive fossil studies that rule out such error sources include expensive sexually selected ornaments having negative effects on the ability to survive natural selection , as well as sexual selection removing a diversity of genes that under current ecological conditions are neutral for natural selection but some of which may be important for surviving climate change. There have been at least five mass extinctions in
17136-676: The heaviest losses include the Cape Floristic Region and the Caribbean Basin . These areas might see a doubling of present carbon dioxide levels and rising temperatures that could eliminate 56,000 plant and 3,700 animal species. Climate change has also been found to be a factor in habitat loss and desertification . Studies of fossils following species from the time they evolved to their extinction show that species with high sexual dimorphism , especially characteristics in males that are used to compete for mating, are at
17289-447: The history of life on earth, and four in the last 350 million years in which many species have disappeared in a relatively short period of geological time. A massive eruptive event that released large quantities of tephra particles into the atmosphere is considered to be one likely cause of the " Permian–Triassic extinction event " about 250 million years ago, which is estimated to have killed 90% of species then existing. There
17442-475: The human era since the Late Pleistocene would require 5 to 7 million years to recover. According to the 2019 Global Assessment Report on Biodiversity and Ecosystem Services by IPBES , the biomass of wild mammals has fallen by 82%, natural ecosystems have lost about half their area and a million species are at risk of extinction—all largely as a result of human actions. Twenty-five percent of plant and animal species are threatened with extinction. In
17595-406: The individual tooth sockets up to the ninth tooth of the upper jaw. After this point, the pits are located further medially. This is also confirmed by the pits present in the lower jaw, indicating interlocking teeth in some areas and a slight overlap further back in the jaw. The enlarged fifth tooth of the maxilla does however occupy more space, with its pit being set much further laterally than any of
17748-439: The initial topic. In addition, the presentation of the research project will help the candidate choose their primary thesis adviser. An undergraduate thesis is completed in the final year of the degree alongside existing seminar (lecture) or laboratory courses, and is often divided into two presentations: proposal and thesis presentations (though this varies across universities), whereas a master thesis or doctorate dissertation
17901-431: The introduced ( or hybrid ) species. Endemic populations can face such extinctions when new populations are imported or selectively bred by people, or when habitat modification brings previously isolated species into contact. Extinction is likeliest for rare species coming into contact with more abundant ones; interbreeding can swamp the rarer gene pool and create hybrids, depleting the purebred gene pool (for example,
18054-517: The latter being slightly more gracile and with interlocking teeth. It is also possible that the two species didn't coexist at all, but instead were driven together by drought. As the oldest described and named mekosuchine, Kambara is considered an important piece in understanding the evolutionary history and origin of this group. Phylogenetic analyses recover it as one of the earliest diverging mekosuchines, but recent studies have commonly found other taxa like Kalthifrons or Australosuchus to be
18207-488: The main drivers of the modern extinction crisis. In January 2020, the UN's Convention on Biological Diversity drafted a plan to mitigate the contemporary extinction crisis by establishing a deadline of 2030 to protect 30% of the Earth's land and oceans and reduce pollution by 50%, with the goal of allowing for the restoration of ecosystems by 2050. The 2020 United Nations ' Global Biodiversity Outlook report stated that of
18360-470: The master's degree requires a praca magisterska (master's thesis). The academic dissertation for a PhD is called a dysertacja or praca doktorska . The submission for the Habilitation is called praca habilitacyjna or dysertacja habilitacyjna . Thus the term dysertacja is reserved for PhD and Habilitation degrees. All the theses need to be "defended" by the author during a special examination for
18513-421: The modern understanding of extinction as the end of a species was incompatible with the prevailing worldview. Prior to the 19th century, much of Western society adhered to the belief that the world was created by God and as such was complete and perfect. This concept reached its heyday in the 1700s with the peak popularity of a theological concept called the great chain of being , in which all life on earth, from
18666-490: The name of a species or other taxon normally indicates its status as extinct. Examples of species and subspecies that are extinct include: A species is extinct when the last existing member dies. Extinction therefore becomes a certainty when there are no surviving individuals that can reproduce and create a new generation. A species may become functionally extinct when only a handful of individuals survive, which cannot reproduce due to poor health, age, sparse distribution over
18819-469: The natural course of events, species become extinct for a number of reasons, including but not limited to: extinction of a necessary host, prey or pollinator, interspecific competition , inability to deal with evolving diseases and changing environmental conditions (particularly sudden changes) which can act to introduce novel predators, or to remove prey. Recently in geological time, humans have become an additional cause of extinction of some species, either as
18972-410: The newly emerging school of uniformitarianism . Jean-Baptiste Lamarck , a gradualist and colleague of Cuvier, saw the fossils of different life forms as evidence of the mutable character of species. While Lamarck did not deny the possibility of extinction, he believed that it was exceptional and rare and that most of the change in species over time was due to gradual change. Unlike Cuvier, Lamarck
19125-545: The oldest diverging. Other studies suggest that Kambara was no mekosuchine at all, but said results are not supported by all authors. Remains of Kambara are exclusively known from the Paleogene of Australia, with the first remains found in rock units of what may be part of the Oakdale Sandstone Formation near the township of Murgon , Queensland . Although known for half a century, the material
19278-399: The original population, thereby increasing the chance of extinction. Habitat degradation is currently the main anthropogenic cause of species extinctions. The main cause of habitat degradation worldwide is agriculture, with urban sprawl , logging, mining, and some fishing practices close behind. The degradation of a species' habitat may alter the fitness landscape to such an extent that
19431-416: The others. Regardless, this clearly sets not just the skulls but also the dentaries apart from those assigned to K. murgonensis . In K. taraina the teeth clearly interlock in the premaxilla as well, however, while the first pair of dentary teeth also extend into the bone, they do not breach the dorsal surface as in K. implexidens . Regardless, much like those of K. implexidens , the dentition of K. taraina
19584-586: The postcranial skeleton include shoulder blades , coracoids , bones of the lower arm, finger bone , pelvic bones , hindlimbs as well as multiple parts of the spinal cord , including nearly the entire cervical series , several dorsal and tail vertebrae as well as lumbar vertebrae in articulation. Ribs and chevrons are likewise known. Most of this material however have not seen formal publication and are only described in Buchanan's PhD thesis . Their general proportions seem to resemble modern crocodiles. Kambara
19737-605: The presentation of theses, for instance ISO 7144 . Other applicable international standards include ISO 2145 on section numbers, ISO 690 on bibliographic references, and ISO 31 or its revision ISO 80000 on quantities or units. Some older house styles specify that front matter (title page, abstract, table of content, etc.) must use a separate page number sequence from the main text, using Roman numerals . The relevant international standard and many newer style guides recognize that this book design practice can cause confusion where electronic document viewers number all pages of
19890-702: The process of speciation —where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche —and species become extinct when they are no longer able to survive in changing conditions or against superior competition . The relationship between animals and their ecological niches has been firmly established. A typical species becomes extinct within 10 million years of its first appearance, although some species, called living fossils , survive with little to no morphological change for hundreds of millions of years. Mass extinctions are relatively rare events; however, isolated extinctions of species and clades are quite common, and are
20043-410: The relative importance of genetic factors compared to environmental ones as the causes of extinction has been compared to the debate on nature and nurture . The question of whether more extinctions in the fossil record have been caused by evolution or by competition or by predation or by disease or by catastrophe is a subject of discussion; Mark Newman, the author of Modeling Extinction , argues for
20196-460: The species is no longer able to survive and becomes extinct. This may occur by direct effects, such as the environment becoming toxic , or indirectly, by limiting a species' ability to compete effectively for diminished resources or against new competitor species. Habitat destruction, particularly the removal of vegetation that stabilizes soil, enhances erosion and diminishes nutrient availability in terrestrial ecosystems. This degradation can lead to
20349-527: The student has included in/with the thesis a statement attesting that he/she is the sole author of the thesis. In the Latin American docta , the academic dissertation can be referred to as different stages inside the academic program that the student is seeking to achieve into a recognized Argentine University , in all the cases the students must develop original contribution in the chosen fields by means of several paper work and essays that comprehend
20502-508: The student's research work. A typical undergraduate paper or essay might be forty pages. Master's theses are approximately one hundred pages. PhD theses are usually over two hundred pages. This may vary greatly by discipline, program, college, or university. A study published in 2021 found that in Québec universities , between 2000 and 2020, master's and PhD theses averaged 127.4 and 245.6 pages respectively. Theses Canada acquires and preserves
20655-402: The study, the methods used, and the findings of the project. Most world universities use a multiple chapter format: Degree-awarding institutions often define their own house style that candidates have to follow when preparing a thesis document. In addition to institution-specific house styles, there exist a number of field-specific, national, and international standards and recommendations for
20808-430: The sudden introduction of human beings to environments full of animals that had never seen them before and were therefore completely unadapted to their predation techniques. Coextinction refers to the loss of a species due to the extinction of another; for example, the extinction of parasitic insects following the loss of their hosts. Coextinction can also occur when a species loses its pollinator , or to predators in
20961-409: The teeth of the upper jaw overlap those of the lower jaw, giving it an overbite similar to that of an alligator . However, both K. implexidens and K. taraina differ significantly, as neither preserve fully overlapping dentition. Instead, distinct occlusal pits reveal that the teeth slid in between each other when the jaw was closed. This means that the teeth of these two species would interlock in
21114-406: The thesis director and at least one evaluator. All the dissertation referees must already have achieved at least the academic degree that the candidate is trying to reach. At English-speaking Canadian universities , writings presented in fulfillment of undergraduate coursework requirements are normally called papers , term papers or essays . A longer paper or essay presented for completion of
21267-412: The thesis proposal is considered to fulfill the qualification by the academic examiners, students then may proceed to write their final assignment. In Iran , usually students are required to present a thesis ( Persian : پایاننامه pāyān-nāmeh ) in their master's degree and a dissertation ( رساله resāleh ) in their Doctorate degree, both of which requiring the students to defend their research before
21420-412: The tiniest microorganism to God, is linked in a continuous chain. The extinction of a species was impossible under this model, as it would create gaps or missing links in the chain and destroy the natural order. Thomas Jefferson was a firm supporter of the great chain of being and an opponent of extinction, famously denying the extinction of the woolly mammoth on the grounds that nature never allows
21573-567: The total extinction of the dodo and the extirpation of indigenous horses to the British Isles. He similarly argued against mass extinctions , believing that any extinction must be a gradual process. Lyell also showed that Cuvier's original interpretation of the Parisian strata was incorrect. Instead of the catastrophic floods inferred by Cuvier, Lyell demonstrated that patterns of saltwater and freshwater deposits , like those seen in
21726-496: The type description is limited to the skull material (two crania and a lower jaw), which is easily comparable to the previously established species, Buchanan takes note of a "considerable amount" of postcranial remains. These remains were partly described in a thesis , but unlike the cranial material have not been formally published. An exception to this is the humerus , which was covered by Stein et al. and noted to differ greatly from modern forms. K. taraina has been recovered from
21879-581: The wider scientific community of his theory. Cuvier was a well-regarded geologist, lauded for his ability to reconstruct the anatomy of an unknown species from a few fragments of bone. His primary evidence for extinction came from mammoth skulls found in the Paris basin . Cuvier recognized them as distinct from any known living species of elephant, and argued that it was highly unlikely such an enormous animal would go undiscovered. In 1812, Cuvier, along with Alexandre Brongniart and Geoffroy Saint-Hilaire , mapped
22032-477: The works are publicly presented to the special council at the end of the training, which thoroughly examines the work. PhD candidates may be allowed to present their work without a written thesis, if they provide enough publications in leading journals of the field, and one of which should be a review article specifically. Malaysian universities often follow the British model for dissertations and degrees. However,
22185-446: Was a medium-sized crocodilian, smaller than the more recent mekosuchines Baru and Paludirex . The holotype specimen of K. implexidens , which may be a subadult, has been estimated to have been 2.5 m (8 ft 2 in), while a much larger mandible suggests lengths of up to 3.5 m (11 ft). K. murgonensis is thought to have been of similar size, albeit with a more robust build. The same applies to K. molnari , which
22338-496: Was described as reaching lengths from 3–4 m (9.8–13.1 ft). Similarities between a then unnamed Kambara and other extinct Australian crocodilians were noted since the description of the Murgon mandible in 1982. By the 1993 description, the idea of an endemic Australian crocodilian radiation was better established, at the time including Australosuchus , Pallimnarchus , Baru and Quinkana . Willis and colleagues took this
22491-491: Was difficult to disprove. When parts of the world had not been thoroughly examined and charted, scientists could not rule out that animals found only in the fossil record were not simply "hiding" in unexplored regions of the Earth. Georges Cuvier is credited with establishing the modern conception of extinction in a 1796 lecture to the French Institute , though he would spend most of his career trying to convince
22644-477: Was first formally described by Ralph Molnar in 1982, who reported a lower jaw bone he believed to belong to a Miocene crocodylid. While noting similarities to other Australian crocodilians, notably Australosuchus (named nine years later), Molnar refrained from naming the material due to the fragmentary nature of the dentary. The mid 1980s saw the discovery of mammal remains in the area, leading to increased study and revised dating. This new-found attention led to
22797-429: Was named in 2005 in the form of K. molnari , although it stands out as the species with the least amount of available material. Like with the species before it, K. molnari was known for a while, with the type specimen found in 1991. However the material was not closely examined until the description of K. implexidens . The most recent addition to this genus was K. taraina , named in 2009 by Lucas A. Buchanan. Although
22950-430: Was not until 1982, when David Raup and Jack Sepkoski published their seminal paper on mass extinctions, that Cuvier was vindicated and catastrophic extinction was accepted as an important mechanism . The current understanding of extinction is a synthesis of the cataclysmic extinction events proposed by Cuvier, and the background extinction events proposed by Lyell and Darwin. Extinction is an important research topic in
23103-458: Was relatively flat, lacking the raised edges seen in today's crocodiles, but instead multiple specimens across species show the presence of well developed pits just before the supratemporal fenestrae . Ever since the first material of Kambara was described, it was recognised as a highly variable genus, retaining certain key traits but differing notably in others. As noted by Buchanan, the most prominent of these differentiating traits centre around
23256-459: Was short and low. The toothrow across all four known species of Kambara differs significantly and is used to set them apart. Generally, three different morphologies can be observed, with the difference being primarily expressed through how the upper and lower toothrow interact with one another. As in many other crocodilians, the dental margin of Kambara appears wave-like, though it is more gentle than some other mekosuchines. In K. murgonensis ,
23409-571: Was skeptical that catastrophic events of a scale large enough to cause total extinction were possible. In his geological history of the earth titled Hydrogeologie, Lamarck instead argued that the surface of the earth was shaped by gradual erosion and deposition by water, and that species changed over time in response to the changing environment. Charles Lyell , a noted geologist and founder of uniformitarianism , believed that past processes should be understood using present day processes. Like Lamarck, Lyell acknowledged that extinction could occur, noting
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