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The class of Blastoidea is an extinct member of the phylum Echinodermata (echinoderms). Blastoids first appear in the Ordovician period and went extinct in the Permian period. During the Carboniferous period blastoids show the biggest diversity in species. Probably blastoids are a predecessor of the so called cystoids.

Like other echinoderms the blastoid’s protective body (exoskeleton) was made up from interlocking plates of calcium, the body consists of 5 symmetrical parts. The body is attached to a stalk which held on to a holdfast on the seafloor.



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