擬海蕾(學名:Parablastoidea)是一類已滅絕的棘皮動物,生存於奧陶紀,化石主要產於北美。[1][4]擬海蕾的外觀類似有莖(柄)的海星,利用莖固著在海底基質上。莖上連接萼部,萼呈梨形,由許多骨板(萼板)組成。口位於萼部口面中央,5條步帶以口為中心像花瓣一樣輻射出,上有腕羽。步帶為蓋板所覆蓋,步帶板間有間輻板共5塊。反口面除底板、輻板各5塊外,尚有5對雙腕板和許多間腕板。[5]
屬
本綱包括以下屬:[4]
- Blastocystis
- Blastoidocrinus
- Cambroblastus
- Eurekablastus
- Meristoschisma
- Pachyocrinus
- Parabolablastus
參考文獻
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