- OphiuroideaOphiuroidea (brittle stars and basket stars), the largest echinoderms; about 1,500 species.simple.wikipedia.org/wiki/Echinoderm
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See all on WikipediaThe phylum contains about 7,600 living species, making it the second-largest group of deuterostomes after the chordates, as well as the largest marine-only phylum. The first definitive echinoderms appeared near the start of the Cambrian. The echinoderms are important both ecologically and geologically. See more
An echinoderm is any deuterostomal animal of the phylum Echinodermata (/ɪˌkaɪnoʊˈdɜːrmətə/), which includes starfish, brittle stars, sea urchins, sand dollars See more
Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial symmetry, their larvae are ciliated, free-swimming … See more
Many echinoderms have great powers of regeneration. Many species routinely autotomize and regenerate arms and viscera. Sea cucumbers often discharge parts of their … See more
Echinoderms are globally distributed in almost all depths, latitudes and environments in the ocean. Adults are mainly See more
The name echinoderm is from Ancient Greek ἐχῖνος (ekhînos) 'hedgehog', and δέρμα (dérma) 'skin'. Echinoderms are bilaterians, … See more
Sexual reproduction
Echinoderms become sexually mature after approximately two to three years, depending on the species and the environmental … See moreLocomotion
Echinoderms primarily use their tube feet to move about, though some sea urchins also use their spines. … See moreWikipedia text under CC-BY-SA license WebMay 18, 2024 · 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.
WebOphiuroidea (brittle stars and basket stars), the largest echinoderms; about 1,500 species. Crinozoa (crinoids: the feather stars or sea lilies): about 600 species that are suspension feeders. Originally these were stalked echinoderms with long arms, rather plant-like in …
WebThe animal. Echinoids are marine animals belonging to the phylum Echinodermata and the class Echinoidea. They have a hard shell (referred to as a test) covered with small knobs (tubercles) to which spines are …
WebLast Updated: October 4, 2019. Echinoderm Definition. An echinoderm is a member of the phylum Echinodermata which contains a number of marine organisms recognized by their pentamerous radial symmetry, …
Species and distribution of echinoderms | Britannica
WebAbout 6,500 existing species are grouped in six classes: feather stars and sea lilies (Crinoidea), starfishes (Asteroidea), brittle stars and basket stars (Ophiuroidea), sea urchins (Echinoidea), sea daisies …
Origin and Early Evolution of Echinoderms | Annual Reviews
WebEchinoderms are a major group (phylum) of invertebrate animals with a rich fossil record stretching back to the Cambrian period, approximately 518 million years ago.
Introduction to the Echinodermata - University of California …
WebThese and many other organisms, living and extinct, make up the Echinodermata, the largest phylum to lack any freshwater or land representatives. Most living echinoderms, like this sand dollar from Baja California, are pentameral; that is, they have fivefold symmetry, with rays or arms in fives or multiples of five. However, a number of fossil ...
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