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Leptolepis
''Leptolepis'' ("Delicate Scale") is an extinct genus of teleost fish that lived from the Middle Jurassic period until the Early Cretaceous. The genus is one of the earliest recognized teleost genera.
== Appearance ==
''Leptolepis'' was about long, and resembled a modern herring, although it was not a close relative of those fish. It was the first true bony fish to really live up to the name, possessing a skeleton completely made of bone; some previous genera such as ''Pholidophorus'' had skeletons composed of bone and cartilage. Another modern development in ''Leptolepis'' were its scales, which lacked the covering still present in previous genera. These two developments made swimming easier, as the bony spine was now more resistant to the pressure caused by the S movements made while swimming.
Mass graves of ''Leptolepis'' have indicated that it probably lived in schools which would provide some protection from predators while the creatures fed on surface plankton. ''Pelagosaurus'' was a known predator of ''Leptolepis'' after a ''Pelagosaurus'' fossil was found with ''Leptolepis'' remains in its stomach.
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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