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Rhenonema
''Rhenonema eifeliense'' ("Rheinland thread of Eifel") is a large, extinct, high-crested holonematid arthrodire placoderm from Givetian-aged strata of Middle Devonian Gerolstein, Germany. It is known from some fragments of armor, including an anterior-lateral plate estimated to be around long, and a portion of a median dorsal plate with a very tall crest running along the median line of the dorsal surface. The ornamentation is very similar to that of ''Holonema'', but the concentrically arranged ridges are much coarser in ''Rhenonema''. The holotype was originally described by Kayser, in 1880, as a species of ''Dinichthys'', but was then redescribed in 1964 by Obruchev as a holonematid. ==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「Rhenonema」の詳細全文を読む
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