Echinoderm - Wikipedia
网页An echinoderm (/ ɪ ˈ k aɪ n ə ˌ d ɜːr m, ˈ ɛ k ə-/) [3] is any deuterostomal animal of the phylum Echinodermata (/ ɪ ˌ k aɪ n oʊ ˈ d ɜːr m ə t ə /), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or …
Echinoderm | Definition, Characteristics, Species, & Facts
网页2024年8月6日 · 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 cucumbers, starfishes, basket stars, and sea daisies. Learn more about echinoderms.
Echinoderm - Definition, Characteristics & Examples - Biology …
网页2019年10月4日 · An echinoderm is a member of the phylum Echinodermata which contains a number of marine organisms recognized by their pentamerous radial symmetry, calcareous endoskeleton, and a water vascular system …
Echinoderms - Smithsonian Ocean
网页Echinoderms possess a unique internal skeleton (or endoskeleton) composed of thousands to millions of calcium carbonate components known as ossicles. Similar to a complicated 3-D puzzle, these pieces are infused with tissue and covered by an epidermis, or skin like covering.
Species and distribution of echinoderms | Britannica
网页Echinoderms are found in all the oceans, from the intertidal zone to the deepest oceanic trenches. Most species have numerous tube feet that are modified for locomotion, respiration, tunneling, sensory perception, feeding, and grasping.
Echinoderm Facts and Information - ThoughtCo
网页2019年3月11日 · Echinoderms, or members of the phylum Echinodermata, are some of the most easily-recognized marine invertebrates. This phylum includes sea stars (starfish), sand dollars, and urchins, and they are identified by their radial body structure, often featuring five arms.
Echinoderms - Definition, Characteristics, Types and Examples
网页2023年3月2日 · 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, making it the second-largest grouping of deuterostomes, after the chordates.
Echinoderm - Evolution, Adaptations, Paleontology | Britannica
网页2024年8月6日 · Echinoderm - Evolution, Adaptations, Paleontology: Phylum Echinodermata was already well diversified by the Lower Cambrian Period; the extensive fossil record has many gaps. There is much disagreement about the classification of …
Echinoderms - MarineBio Conservation Society
网页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” translates to “ …
About Echinoderms | Assembling the Echinoderm Tree of Life
网页Echinoderms are an exclusively marine group of animals with a rich evolutionary history extending back more than 540 million years. 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 during the ...
跳至内容