Echinoderm - Any member of the phylum Echinodermata, a group of exclusively marine animals that have a water-vascular system, which circulates water and assists them in both feeding and locomotion. Examples of echinoderms include sea urchins, star fish, brittle stars, sea cucumbers, heart urchins, sand dollars, cystoids, blastoids, and crinoids.
marine invertebrates with tube feet and calcite-covered five-part radially symmetrical bodies
a kind of sea animal with spiny skin
A class of spiney-shelled invertebrate marine animals, characterised by an internal skeleton of porous calcite plates
ek- eye-no-derm Invertebrate that has a body in five parts (e.g. starfish).
ee-KINE-o-derm Animal with a five-part body plan, radial symmetry, and a spiny outer covering. 513
n. Phylum Echinodermata. A group of marine invertebrate animals, including sea urchins, sea stars, and sea cucumbers; characterized by a skeleton made of little plates, which may be a rigid armor as in sea urchins, or made of small plates in a leathery body wall as in holothurians (sea cucumbers).
Invertebrate with penta-radial symmetry, often covered by a hard or spiny skin, including sea urchins and sea cucumbers; of the phylum Echinodermata
A type of invertebrate sea animal. Ex: starfish, sea urchins, crinoids.
One of a group of invertebrate animals identified by their spiny skin, including sea stars, sea urchins and sand dollars. "Echinos" means spiny; "derma" means skin.
Echinoderms (Phylum Echinodermata, from the Greek for spiny skin) are a phylum of marine animals found at all depths. This phylum appeared in the early Cambrian Period and contains about 7,000 living species and 13,000 extinct ones.
