Crinoidea

Still Kicking!

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This article belongs to a living fossil, an organism remained unchanged for ages! These animals are used here to learn about members of a "primitive" clade.

Smaller than a Microraptor!

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Crinoidea, referred to as crinoids, is a class of echinoderms that first appeared in the Ordovician period and still live today.

Gallery

Fossil from Germany showing the stem, calyx, and arms with pinnules

Crinoid holdfasts and bryozoans on an Upper Ordovician cobble from northern Kentucky

330 million year old crinoid fossils from Iowa