Echinoderm - Wikipedia
The first definitive echinoderms appeared near the start of the Cambrian. Echinoderms are important both ecologically and geologically. Ecologically, there are few other groupings so …
Echinoderm | Definition, Characteristics, Species, & Facts ...
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 …
Echinoderms: Sea Stars, Urchins, Sand Dollars, and Relatives ...
Echinoderms possess an unusual suite of appendages on their skeletons, which are used for movement, interaction, and defense. In addition to spines, urchins and sea stars both possess …
Echinoderms - Definition, Examples, Characteristics, and Habitat
Jun 30, 2025 · Echinoderms are spiny-skinned invertebrates of the phylum Echinodermata, specifically recognized by the pentamerous body (five-pointed) symmetry in adults. The …
Echinoderms - MarineBio Conservation Society
Echinoderms include several familiar organisms such as starfish (or sea stars), sea urchins, sand dollars, sea cucumbers, and brittle stars. These animals are found in oceans worldwide, from …
About Echinoderms | Assembling the Echinoderm Tree of Life
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 Examples: Types Of Echinoderms From Around The …
Feb 6, 2024 · Echinoderms are a group of animals that include starfish, sea urchins, sea cucumbers, brittle stars, sea lilies and feather stars. On this page is a complete guide to …