Several free-swimming species of Cubozoa and Scyphozoa possess balance-sensing statocysts, and some have simple eyes. Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both (hence they are trimorphic). Both forms have a single orifice and body cavity that are used for digestion and respiration. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick.Ĭnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.
Pacific sea nettles, Chrysaora fuscescensĬnidaria ( / n ɪ ˈ d ɛər i ə, n aɪ-/) is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Class Hydrozoa- hydroids, hydra-like animals.Class Cubozoa- box jellyfish, sea wasps.Subphylum Medusozoa- jellyfish and hydrozoans:.Subphylum Anthozoa- corals and sea anemone.
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