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Protopsephurus
''Protopsephurus'', from the Ancient Greek πρῶτος (prôtos, “first”), ψῆφος (psêphos, “pebble”), and φύρως (phúrōs, "mixer”), is an extinct genus of paddlefish which existed in China during the Barremian age to the Aptian age of the Early Cretaceous period.〔(【引用サイトリンク】title=''Protopsephurus liui'' )〕〔(【引用サイトリンク】title=Paddlefish Classes )〕 It contains the species ''Protopsephurus liui'', which was measured to be 7 meters (23 feet) in length, although no weight estimate could be made at the time.
==Description==
The remains of 2 individuals that have been discovered in the Yixian Foundation can be compared to living members of the Paddlefish family to show that very little has changed about them since the Early Cretaceous. Unlike other filter feeding fish that have been discovered with many members but extremely fragmented remains, only two members of ''Protopsephurus'' have been discovered and nearly all the skeletal elements of this chondrostean ray-finned fish species have remained. It is the largest freshwater fish of the Cretaceous era, to which the Cretoxyrhina was the largest predatory saltwater fish of the Cretaceous era.
The rostrum is narrow and sword-like instead of broad and paddle-like, and its skin is smooth and scaleless. Its eyes are minimalized and poorly developed, it has a heterocercal tail, and
The origin of their name comes from the belief that the paddlefish used their rostrum to excavate bottom substrate in order to find prey.
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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