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Blastoidea
(redirected from Blastoid)

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Blastoidea

Class of extinct marine echinoderms that existed from the Ordovician to Permian periods, but were particularly abundant in the early Carboniferous period. Blastoids were stemless or short-stemmed suspension-feeders with a budlike skeleton made of relatively few symmetrically arranged calcareous plates. They possessed an elaborate system of enclosed canals, or hydrospires, which probably served a respiratory function. Pentremites are an example, found abundantly in early Carboniferous limestone.

Classification

Blastoidea is in phylum Echinodermata.


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When Baumiller looked at more than 4,000 fossils of the blastoid Heteroschisma, he found that 139 had conical or cylindrical holes.
 
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