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Holonema
''Holonema'' is an extinct genus of relatively large, barrel-shaped arthrodire placoderms that were found in oceans throughout the world from the Mid to Late Devonian, when the last species perished in the Frasnian-Fammian extinction event. Most species of the genus are known from fragments of the armor, but the Gogo Reef species, ''H. westolli'', is known from whole, articulated specimens. According to these specimens, species of ''Holonema'' lived by grazing on stony, horn-shaped, stromatolite-like algae called oncholite, apparently by snipping off the points with a specialized snout. ==Species==
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「Holonema」の詳細全文を読む
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