CYSTOID FOSSILS FOR SALE

Cystoids extinct echinoderms similar to crinoids. They consist of a stalk, theca (body) and brachials (feeding arms). Most lived fixed to the seafloor but some were more mobile. Like modern echinoderms, cystoids were arranged in a pentaradial pattern and had a water vascular system. They first appeared in the Cambrian Period and disappeared in the Carboniferous. Read more...
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12 Items ($7 to $895)