echinoderm

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echinoderm

any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers
References in periodicals archive ?
Reproductive cycle and biometric relations in a population of Actinopyga echinites (Echinodermata: Holothuroidea) from the lagoon of New Caledonia, western tropical Pacific.
The dermis of the sea cucumber Actinopyga echinites has a tensile viscosity of 100 MPa [center dot] s (Motokawa, 1984b).