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- Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.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.www.britannica.com/animal/echinodermEchinoderms are a successful phylum of marine animals. They include sea stars, brittle stars, sea urchins, sea cucumbers and their relatives.simple.wikipedia.org/wiki/Echinoderm
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- A modern classification
1. Asterozoa: about 1,500 species that catch prey for their food. 1.1. Asteroidea: the starfish. 1.1.1. Sea daisies, notable for their unusual water vascular system. Only two species, now merged into Asteroidea. 1.2. Ophiuroidea (brittle stars and basket stars), the largest echinoderms; about 1,5… - A simplified classification
For many purposes it is better to use the following classification. It is easier to learn and understand, and is based more on the living forms.p19 1. Asteroidea: the starfish. 2. Ophiuroidea: the brittle-stars 3. Echinoidea: the sea-urchins 4. Holothuroidea: the sea-cucumbers 5. Crinoide…
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- A modern classification
WebTogether, 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 …
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.
Sea urchins are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin are distributed on the seabeds of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters (16,000 ft; 2,700 fathoms). The spherical, hard shells (tests) of sea urchins are round and covered in spines. Most urchin spines range in length from 3 to 10 cm (1 to 4 i…
Wikipedia · Text under CC-BY-SA licenseWebExamples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig. 3.83). Although they may appear very different, echinoderms all have two major defining characteristics that set them apart from all other animals: a water vascular system and five-sided radial symmetry.
WebEchinodermata (Echinoderms) is a phylum of Animal. There are 10475 species of Echinoderms, in 1891 genera and 280 families. It includes groups like Crinoids And Relatives. EOL has data for 10 attributes, …
Echinoderms ~ MarineBio Conservation Society
WebEchinoderms are a diverse group of marine animals belonging to the phylum Echinodermata. They are characterized by a unique radial symmetry and a spiny or.
WebMar 11, 2019 · 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 …
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. While all modern species are characterized by pentaradial (i.e., fivefold) symmetry, Cambrian echinoderms also include taxa with different types of symmetry (e.g., bilateral symmetry).
Echinoderm - Evolution, Adaptations, Paleontology | Britannica
WebPhylum Echinodermata (echinoderms) Marine invertebrates worldwide in distribution; skeleton composed of calcium carbonate in the form of calcite; most fossils and all living representatives with 5-part body symmetry (pentamerous); part of body cavity (coelom) comprises a water-vascular system. Cambrian to Recent.
Echinodermata - Animalia
WebAn echinoderm is any member of the phylum Echinodermata . The adults are recognisable by their (usually five-point) radial symmetry, or pentamerous symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies". Adult echinoderms are found on the sea bed at every ocean depth, from the …
Echinoderm - New World Encyclopedia
WebEchinoderms (Phylum Echinodermata, from the Greek for spiny skin) are a phylum of marine invertebrates that are generally characterized by a hard, internal calcite skeleton (typically with spines), a water-vascular system, adhesive "tube feet," and five-rayed radial symmetry (at some point in their lives).
Species and distribution of echinoderms | Britannica
WebEchinoderms 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 | Encyclopedia.com
WebMay 14, 2018 · The echinoderms ( echino means "spiny;" derm means "skin") are large, conspicuous, entirely marine invertebrates. Today, this group inhabits virtually every conceivable oceanic environment, from sandy beaches and coral reefs to the greatest depths of the sea. They are also common as fossils dating back 500 million years.
Echinoidea - Digital Atlas of Ancient Life
WebMay 27, 2020 · Fossil record: Ordovician to Recent. Overview. Echinoidea comes from the Greek word ‘echinos’ meaning “spiny” and includes the sea urchins, sand dollars, and heart urchins. Echinoids are the sister taxa to holothuroidians within the Echinozoa clade.
The active evolutionary lives of echinoderm larvae | Heredity
WebJul 19, 2006 · We review the evolution of the diverse larval forms of living echinoderms to outline the origins of echinoderm larval forms, their diversity among living echinoderms, molecular clocks and rates of ...
Exclusively Fossil Taxa - Digital Atlas of Ancient Life
WebJun 22, 2020 · Overview. The earliest echinoderms evolved a variety of forms that make them almost unrecognizable as members of this phylum. For example, many of the species in the image below exhibit bilateral symmetry rather than the pentaradial symmetry that characterizes this phylum.
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