Phylum Echinodermata
Class Crinoidea sea lilies
Class Asteroidea sea star
Class Ophinuroidea brittle star
Class Echinoidea sea urchin
Class Holothuroidea sea cucumber
Source: Professor Blake Barron's Lab Manual
--"Lectures which really teach will never be popular; lectures which are popular will never really teach."-- Michael Faraday
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