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Cnidaria
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Details
Cnidaria is a phylum containing over 9,000 species of animals found exclusively in aquatic, mostly marine, environments. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. They have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both. Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors. Several free-swimming Cubozoa and Scyphozoa possess balance-sensing statocysts, and some have simple eyes. All cnidarians reproduce sexually. Many have complex lifecycles with asexual polyp stages and sexual medusae, but some omit either the polyp or the medusa stage.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786130228866
- Editor Frederic P. Miller, Agnes F. Vandome, John McBrewster
- Sprache Englisch
- Größe H220mm x B22mm x T150mm
- Jahr 2009
- EAN 9786130228866
- Format Fachbuch
- ISBN 978-613-0-22886-6
- Titel Cnidaria
- Untertitel Silent letter, Phylum, Species, Animal, Ocean, Cnidocyte, Epithelium, Mesoglea, Cell (biology), Medusa (biology), Sessility (zoology), Polyp, Symmetry in biology, Body orifice
- Gewicht 500g
- Herausgeber Alphascript Publishing
- Anzahl Seiten 364
- Genre Biologie
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