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Microsteus
''Microsteus'' is a genus of small selenosteid arthrodire placoderms known from the Upper Frasnian Kellwasserkalk facies of Late Devonian Germany. There are three species, ''M. dubius'' (the type species), ''M. angusticeps'', and ''M. gracilis''. ''M. angusticeps'' differs from the type species in having a head with an angular profile, and ''M. gracilis'' differs from the other two species by being somewhat narrower in cross-section. Denison (1978) suggests that ''M. angusticeps'' and ''M. gracilis'' do not have enough differences from ''M. dubius'' to merit separate species status, but other authors, such as Rücklin 2011, treat the three as separate species. ''M. angusticeps'' and ''M. gracilis'' originally composed the genus ''Parawalterosteus''. However, Denison (1978) points out that the two species are not distinct from ''Microsteus'', and synonymized ''Parawalterosteus'' with the former genus. ==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「Microsteus」の詳細全文を読む
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