In biological classification , a subfamily ( Latin : subfamilia , plural subfamiliae ) is an auxiliary (intermediate) taxonomic rank , next below family but more inclusive than genus . Standard nomenclature rules end botanical subfamily names with "-oideae", and zoological subfamily names with "-inae".
2-599: See text Cygninae The Anserinae are a subfamily in the waterfowl family Anatidae . It includes the swans and the true geese . Under alternative systematical concepts (see e.g., Terres & NAS, 1991), it is split into two subfamilies, the Anserinae contain the geese and the ducks, while the Cygninae contain the swans. Swans (Tribe Cygnini ) True geese (Tribe Anserini) Unresolved These two genera are distinct from other geese and often elevated to
4-484: A subfamily of their own (Cereopsinae), or alternatively into the shelduck subfamily Tadorninae: Tribe Cereopseini Some enigmatic subfossils of very large goose-like birds from the Hawaiian Islands do not appear to be moa-nalos (goose-sized dabbling ducks ). They cannot be assigned to any genus living today, though most, if not all, may be fairly close to Branta : Subfamily Detarioideae
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