7-718: Discosauriscus was a small seymouriamorph which lived in what is now Central and Western Europe during the latest Carboniferous and in the Early Permian Period. Its best fossils have been found in the Broumov and Bačov Formations of Boskovice Furrow , in the Czech Republic . Discosauriscus belongs to the order Seymouriamorpha , and is the type genus of the family Discosauriscidae . Currently recognised are two valid species - Discosauriscus austriacus and Discosauriscus pulcherrimus . Letoverpeton
14-469: Is a junior synonym of Discosauriscus . Discosauriscids were long thought to be known from larval or neotenic forms, and three ontogenetic stages had been distinguished. However, more recent studies concluded that some subadult, probably terrestrial specimens were known, so the case for neoteny in this taxon is not as well-supported as once thought. Discosauriscus had wide jaws with sharp teeth, short limbs and relatively long tail. The phalangeal formula
21-401: Is an extinct genus of seymouriamorph from the lower Permian . Fossils have been found from Tajikistan representing over 900 individuals of various stages of ontogenic development. However, it is thought that none of these specimens are of fully mature animals as poor bone ossification is present and the neural arches are paired and disarticulated from the pleurocentra. Ariekanerpeton
28-407: Is thought to have been more closely related to Discosauriscus and Seymouria than to Utegenia due to the absence of gastralia or a postorbital - supratemporal contact. However, it is not a member of the family Discosauriscidae or the family Seymouriidae . There are no dermal scales present on post-metamorphic specimens as there are on Discosauriscus . Lateral lines are present in
35-460: The lateral line system have been found, making them unquestionably non-amniotes. As they matured, they became more terrestrial and reptile -like. They ranged from 30 cm (1 ft) long lizard -sized creatures to the 1.5 m (5 ft) long Enosuchus . If seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes . Seymouriamorphs are divided into three main groups: Kotlassiidae , Discosauriscidae , and Seymouriidae , which includes
42-782: The best-known genus, Seymouria . The last seymouriamorphs became extinct by the end of the Permian . Cladogram based on Ruta, Jeffery, & Coates (2003): Kotlassia Utegenia Seymouria baylorensis Seymouria sanjuanensis Ariekanerpeton Discosauriscus austriacus Discosauriscus pulcherrimus Cladogram based on Klembara (2009) & Klembara (2010): Utegenia Seymouria Karpinskiosaurus Makowskia Spinarerpeton Ariekanerpeton Discosauriscus [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] Ariekanerpeton A. sigalovi Ivakhnenko, 1981 ( type ) Ariekanerpeton
49-837: Was 2-3-4-5-3 for both hind- and forelimbs. The body was covered with rounded scales with concentric rings, and a well-preserved lateral-line system has been described. Discosauriscus may have had electroreceptive organs. [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] Seymouriamorpha See text . Seymouriamorpha were a small but widespread group of limbed vertebrates ( tetrapods ). They have long been considered stem - amniotes ( reptiliomorphs ), and most paleontologists still accept this point of view, but some analyses suggest that seymouriamorphs are stem-tetrapods (not more closely related to Amniota than to Lissamphibia ). Many seymouriamorphs were terrestrial or semi-aquatic. However, aquatic larvae bearing external gills and grooves from
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