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Hemicyclaspis : ウィキペディア英語版 | Hemicyclaspis
''Hemicyclaspis'' (meaning ''half-round shield'' or ''semicircle plate'') is an extinct genus of primitive jawless fish, closely related to ''Cephalaspis'', that lived in the Devonian period in what is now Europe and North America. A typical cephalaspid, ''Hemicyclaspis'' had a heavily armored, shovel-shaped headshield. It is thought to have been a better swimmer than most of its relatives because of its powerful tail, stabilizing dorsal fin and the keel-shaped hydrodynamic edges of its head shield. ''Hemicyclaspis'' probably foraged the ocean floor for food. ''Hemicyclaspis'' grew to a length of 5 inches (13 centimeters) and would most likely have fed on particles from the muddy sea bed. ==References==
* Parker, Steve. Dinosaurus: the complete guide to dinosaurs. Firefly Books Inc, 2003. Pg. 58
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「Hemicyclaspis」の詳細全文を読む
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