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Batrachomimus
''Batrachomimus'' is an extinct genus of neosuchian crocodyliform known from the Late Jurassic of northeastern Brazil. It contains a single species, ''Batrachomimus pastosbonensis'', which was first described and named by Felipe C. Montefeltro, Hans C. E. Larsson, Marco A. G. de França and Max C. Langer in 2013. It is known from a nearly complete skull, osteoderms and limb bones. ''Batrachomimus'' belongs to the family Paralligatoridae and predates all other members of the family and its immediate sister group, Eusuchia, by 30 million years.
==Description==
''Batrachomimus'' is known from a single holotype skull known as LPRP/USP-0617, which preserves most of the skull and lower jaws except for the skull table, braincase, and the left temporal region. The skull is about 20 cm long, giving an estimated total body length of about 1 m. ''Batrachomimus'' has a narrow snout with wavy margins around the teeth. It is unique in having a smooth area of bone on the maxilla near the back of the snout; most crocodyliforms have heavily pitting covering the entire upper surface of the skull, including all of the maxilla. Another unique feature or autapomorphy of ''Batrachomimus'' is the hourglass-shape of its choanae, two holes on the underside of the skull that are openings for the nasal passages. Other distinguishing features of ''Batrachomimus'' are its lack of antorbital and mandibular fenestrae (holes in front of the eyes and at the back of the lower jaw, respectively), and a backward extension of the premaxilla bone on the snout to the level of the fifth tooth of the maxilla bone behind it.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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