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. Beginning with the dawn of the Cambrian Period (542 million to 488 million years ago), echinoderms have a rich fossil history and are well represented by many bizarre groups, most of which are now ...
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 …
Echinoderms - Smithsonian Ocean
网页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 dwellers, they can be found at depths over …
棘皮动物门 - 百度百科
网页棘皮动物门（Echinodermata）是一类后口动物（deuterostomes），在 无脊椎动物 中进化地位很高。. 大多底栖，少数海参行浮游生活；自由生活的种类能够缓慢移动。. 从浅海到数千米的深海都有广泛分布。. 现存种类6000多种，但化石种类多达20000多种，从早 寒武纪 ...
5.6: Phylum Echinodermata - Biology LibreTexts
网页2022年8月24日 · Echinoidea is the class of Echinoderms that includes sea urchins, sand dollars, sea biscuits and others. The spines observed on these organisms are actually mobile, which serves to enhance protection, feeding, and aid in movement. Echinoidea are encased in an endoskeleton commonly called a test.
28.7 Phylum Echinodermata – General Biology - University of …
网页This phylum is a collection of about 7,000 described living species of exclusively marine, bottom-dwelling organisms. Sea stars (Figure 28.47), sea cucumbers, sea urchins, sand dollars, and brittle stars are all examples of echinoderms.
Species and distribution of echinoderms | Britannica
网页Sea star, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk. Despite their older common name, they are not fishes. The roughly 1,600 living species of …
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. You can often see echinoderm species in a …
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: Current Biology - Cell Press
网页2005年12月6日 · Echinoderms — from the Greek for spiny skin — are invertebrates that exclusively inhabit marine environments. Most species have a five-fold radial body plan. Echinoderms are monophyletic and comprise a sister-group to the hemichordates (acorn worms). There are approximately 7,000 extant echinoderm species …
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