Echinoderms

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Echinoderms are all members of the phylum Echinodermata. There are five classes within Echinodermata: Asteroidea, Crinoidea, Echinoidea, Holothuroidea, and Ophiuroidea. The University of Arkansas Museum collections includes Arkansas fossil remains for Crinoidea and Echinoidea.

An irregularly shaped rock against a white surface with fossil impressions throughout it.

Crinoidea

Underwater scene with a "fuzzy" sea star on a rock with sand and vegetation behind it.

Echinoidea