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Takakkawia
''Takakkawia'' is a genus of sponge known from the Middle Cambrian Burgess Shale that reached around 4 cm in height. Its structure comprises four columns of multi-rayed, organic spicules (perhaps originally calcareous or siliceous) that align to form flanges. The spicules form blade-like structures, ornamented with concentric rings.〔 It was named by Walcott after the Takakkaw falls which mark the start of the trail to Fossil Ridge.
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「Takakkawia」の詳細全文を読む
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