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Seastars

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(5 total)

Henricia venturana
Henricia venturana
© 2006 The Virtual Fossil Museum

Stenaster salteri
Stenaster salteri
© 2006 Joe Koniecki

Salteraster huxleyi
Salteraster huxleyi
© 2006 Joe Koniecki

What are Seastars? Two different groups of echinoderms are often lumped together as “sea stars:”

True sea stars (Asteroidea) have tube feet used for locomotion and capturing prey. The asteroids are the oldest members of this group, appearing in the Ordovician.
Brittle stars (Ophiuroidea) move by wriggling their slender, snaky arms. Brittle stars have a distinctive central disk-shaped body.

First known fossil occurrence: Ordovician.

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

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