There are about 7,600 extant species of echinoderm as well as about 13,000 known extinct species. [9][10] All echinoderms are marine, but they are found in habitats ranging from shallow intertidal …

Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin. Living species include sea lilies, sea urchins, sea …

Jun 30, 2025 · Echinoderms are spiny-skinned invertebrates of the phylum Echinodermata, specifically recognized by the pentamerous body (five-pointed) symmetry in adults. The phylum derives its name …

Together, these animals make up the Echinodermata, a word with Greek origins meaning “hedgehog skin.” Echinoderms live in every ocean, even off the coast of Antarctica. Well known as coastal …

Echinoderms are a diverse group of marine animals belonging to the phylum Echinodermata. They are characterized by a unique radial symmetry and a spiny or prickly outer skin. The name “echinoderm” …

6 days ago · Echinoderms are a diverse group of invertebrate marine animals that include starfish, sea urchins, sand dollars, sea cucumbers, and crinoids. The phylum contains about 7,000 living species, …

Whereas five major groups of echinoderms are living today (starfish, brittle stars, sea urchins, sea cucumbers, and sea lilies), more than 20 other, equally distinctive extinct echinoderms groups lived …