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Tristychius
''Tristychius'' is an extinct genus of shark from the Carboniferous period. Fossils have been found in Scotland. ''Tristychius'' was a small shark, about long. It had a well-developed upturned caudal fin, similar to that of many modern sharks. Physically it may have resembled a modern dogfish. ''Tristychius'' also had spikes attached to the bases of its dorsal fins, probably for protection against predators. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Tristychius」の詳細全文を読む
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