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A phylum of Metazoa that includes starfish, sea urchins, sea lilies, and other classes. All but the sea cucumbers (Holothuroidea) are basically radially symmetrical and most possess a calcareous endoskeleton with external spines. They inhabit the sea bottom, some near shore, others in deep water.
[echino- + G. derma, skin]
References in periodicals archive ?
Catalogue of the Echinodermata in the Australian Museum.
Scyliorhinus canicula exhibited a diverse diet, composed of 63 different taxa, belonging to eight taxonomical groups: Sipuncula, Annelida, Crustacea, Mollusca, Echinodermata, Urochordata, Chondrichthyes, and Teleostei, as well as unidentified materials (Table 1).
Squalus blainville showed a less diverse diet, composed of 30 different prey item types, grouped into six taxonomical categories: Sipuncula, Annelida, Crustacea, Mollusca, Echinodermata, and Teleostei, as well as unidentified materials (Table 2).
Phylum Echinodermata Class Echinoidea Order Arbacioida Family Arbaciidae
N Annelida Chloeia viridis N Arthropoda Dromidia larraburei Hemisqulla ensigera P Stenorhynchus debilis N Mollusca Chromodoris galexorum N Pleurobranchus areolatus N Polycera alabe N Pteria sterna P Echinodermata Arbacia incisa N Centrostephanus coronatus P Holothuria impatiens N California Channel Island Phylum Species SCL SBA SNI Cnidaria Bunodeopsis sp.
The taxonomic groups with a greater contribution for total biomass were Bivalvia, followed by Gastropoda, Polychaeta, and Echinodermata.

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