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Ustia (genus) : ウィキペディア英語版 | Ustia (genus)
''Ustia'' is an extinct genus of biarmosuchian therapsid from the Middle Permian of Russia. It is known from a single species, ''Ustia atra'', which was described in 2003 from an isolated lower jaw. ''Ustia'' was classified in the family Ictidorhinidae, which also includes the genus ''Ictidorhinus'' from South Africa. Both are relatively small biarmosuchians. Several other Russian therapsids known only from lower jaw bones have been placed in Ictidorhinidae, and the family is likely a paraphyletic assemblage representing a small body type than a true clade. ==References==
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