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Bulbaspis
''Bulbaspis'' ("bulb shield") is a late Ordovician genus of Asaphid trilobites of the family Raphiophoridae found primarily in upper Ordovician-aged deepwater marine strata of China. Species of ''Bulbaspis'' are similar to other raphiophorids like ''Ampyx'' and ''Raphiophorus'', save that the long spine that emanates from the glabella of the latter two genera has been modified into a knob-like or bulb-like structure in ''Bulbaspis'' that developed incrementally in the animal's growth. == 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「Bulbaspis」の詳細全文を読む
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