home   Printer friendly version Add to site
Advanced search
Time & Space Fossil Gallery Famous Flora & Fauna
Careers Resources K-12 Collections PaleoPeople

Echinoderms

> Seastars | Echinoids | Crinoids | Other Echinoderms

See More Images
(72 total)

Taxocrinus
Taxocrinus
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum

Stenaster salteri
Stenaster salteri
© 2006 Joe Koniecki

Pentremites obesus
Pentremites obesus
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum

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.

Cool Echinoderms links:

Search for images of Echinoderms on Google

help