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> Seastars | Echinoids | Crinoids | Other Echinoderms

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(72 total)

Eucalyptocrinites crassus
Eucalyptocrinites crassus
© 2004 Indiana State Museum, Indiana Geological Survey, and Indiana University

Oligopygus wetherbyi
Oligopygus wetherbyi
© 2000 Tom Maier

Caryocrinites persculptis Springer
Caryocrinites persculptis Springer
© 2003 Falls of the Ohio State Park

What are Echinoderms? Echinoderms, meaning “spiny-skinned,” include sand dollars, sea urchins, and sea stars, as well as less familiar creatures, such as sea cucumbers, crinoids, blastoids, and cystoids. This diverse group is entirely marine and is characterized by the presence of five-fold symmetry. Echinoderms have a specialized system of internal canals that circulates water through the body and services numerous, tiny appendages, called tube feet. They use their tube feet to move around or to capture food.

First known fossil occurrence: Cambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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