A class of coelenterates or jellyfishes, including Hydra, a freshwater polyp, Physalia, the “Portuguese man-of-war,” Millepora, a stinging coral, and the sea wasps, Chironex heckeri and Chiropsalmus quadrigatus, whose stings can cause severe wheals, pain, and skin necrosis, and occasionally rapid death from respiratory and cardiac depression. [hydro- + G. zoon, animal]

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Hy·dro·zoa .hī-drə-'zō-ə n pl a class of coelenterates that includes various simple and compound polyps and jellyfishes having no stomodeum or gastric tentacles

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Hy·dro·zoa (hi″drə-zoґə) [Gr. Hydra a mythical nine-headed monster + zoon animal] a class of invertebrates of the phylum Cnidaria, usually possessing colonial branching polyps and small medusa-like bodies. It includes the poisonous genera Gonionemus, Millepora, and Physalia.

Medical dictionary. 2011.

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  • Hydrozoa — Hy dro*zo a, n. pl. [NL., fr. E. hydra + Gr. zo^,on an animal.] (Zo[ o]l.) The Acaleph[ae]; one of the classes of c[oe]lenterates, including the Hydroidea, Discophora, and Siphonophora. [1913 Webster] …   The Collaborative International Dictionary of English

  • Hydrozoa — Hydrozōa, s. Hydroidpolypen …   Kleines Konversations-Lexikon

  • Hydrozoa —   [griechisch »Wassertiere«], Hydrozoen, zu den Nesseltieren gehörende Hohltiere mit rund 2 700 Arten von 1 mm bis über 2 m Länge. Die Fortpflanzung erfolgt mit einem Generationswechsel zwischen den fest sitzenden Polypen (Hydroidpolypen;… …   Universal-Lexikon

  • Hydrozoa — Hydrozoa, Klasse der ⇒ Cnidaria mit etwa 2700 Arten, die einzeln oder in Kolonien leben und zumeist einen Generationswechsel zwischen ⇒ Polyp und ⇒ Meduse zeigen. Die Medusen bilden am Schirmrand eine nach innen gerichtete Falte (Velum). Man… …   Deutsch wörterbuch der biologie

  • Hydrozoa — Taxobox name = Hydrozoa image width = 240px image caption = Closeup of a hydrozoan colony regnum = Animalia subregnum = Eumetazoa phylum = Cnidaria subphylum = Medusozoa classis = Hydrozoa classis authority = Owen, 1843 subdivision ranks =… …   Wikipedia

  • Hydrozoa — Aglaopheni …   Wikipédia en Français

  • Hydrozoa —   Hydrozoa Hidrozoo colonial (Aglaophenia) …   Wikipedia Español

  • Hydrozoa — Hydrozoen Portugiesische Galeere (Physalia physalis) Systematik Domäne: Eukaryoten (E …   Deutsch Wikipedia

  • Hydrozoa — Hydrozoon Hy dro*zo [ o]n, n.; pl. L. {Hydrozoa}, E. {Hydrozo[ o]ns}. [NL.] (Zo[ o]l.) One of the Hydrozoa. [1913 Webster] …   The Collaborative International Dictionary of English

  • Hydrozoa — Animal An i*mal, a. [Cf. F. animal.] 1. Of or relating to animals; as, animal functions. [1913 Webster] 2. Pertaining to the merely sentient part of a creature, as distinguished from the intellectual, rational, or spiritual part; as, the animal… …   The Collaborative International Dictionary of English

  • hydrozoa — noun a large group of marine animals, of the class Hydrozoa, whose life cycles contain a sexual and asexual stage …   Wiktionary

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