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 …

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 …

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

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 …

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 …

5 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 …

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 …

Echinoderms are an exclusively marine phylum with four distinctive characteristics: Echinoderms use a water vascular system for moving, feeding and respiration. They have a skeletal system …

Aug 4, 2025 · Echinoderms are a group of marine invertebrates found across all the world’s oceans, from shallow coastal waters to the deepest abyssal plains. These organisms …

Aug 3, 2023 · Echinoderms are enterocoelous coelomates with pentamerous radial symmetry, without distinct head or brain having a calcareous endoskeleton of separate plates or pieces …