Scyphozoa


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Related to Scyphozoa: Anthozoa, Staurozoa

Scyphozoa

[‚sī·fə′zō·ə]
(invertebrate zoology)
A class of the phylum Cnidaria; all members are marine and are characterized by large, well-developed medusae and by small, fairly well-organized polyps.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Scyphozoa

 

a class of solitary marine animals of the phylum Coelenterata. Scyphozoans occur in the form of jellyfish or polyps and are radially symmetrical. The gastric cavity is divided by interradial mesenteries into a central cavity and lateral pouches. Many scyphomedusae have a system of digestive canals. The life cycle is characterized by alternating generations (metagenesis). A planula larva develops from an egg and, after settling on a substrate, becomes a scyphistoma, an individual of the polypoid generation. The scyphistoma buds off polyps like itself and releases ephyrae (larvae of the sexually reproducing generation) by constriction (strobilation).

Bodily contact with certain scyphozoans, for example, Rhizostomae, may cause pain and skin burns. Persons have been known to die after being poisoned by individuals of the genus Chirodrophus, which dwell off northern Australia. Some scyphozoans, for example, Rhizostomae and Aurelia, are commercially significant; they are salted and used as food.

The class of Scyphozoa, comprising the orders Discomedusae, Rhizostomae, Coronatae, and Stauromedusae, includes approximately 200 species, which are distributed throughout the oceans of the world, mostly in temperate and tropical waters. Approximately 30 species occur in the USSR.

REFERENCES

Naumov, D. V. Stsifoidnye meduzy morei SSSR. Moscow-Leningrad, 1961.
Bronns, H. G. Klassen und Ordnungen des Tierreichs, vol. 2, part 2, fascs. 1–6. Leipzig, 1936–59.
Kramp, P. L. Synopsis of the Medusae of the World. Cambridge, 1961.

D. V. NAUMOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
New family of allomorphic jellyfishes, Drymonematidae (Scyphozoa, Discomedusae), emphasizes evolution in the functional morphology and trophic ecology of gelatinous zooplankton.
Occurrence of the alien jellyfish Cassiopea andromeda (Scyphozoa: Rhizostomeae: Cassiopeidae) in Hisaronu Bay, Mugla, Turkey.
A modern description of Crambionella stuhlmanni (Scyphozoa: Rhizostomeae) from St Lucia Estuary, South Africa.
GOA (n=18) Prey name % W % FO Scyphozoa (jellyfish) 98.84 100 Ctenophora (comb jelly) Polychaeta (worm) Calanoida(copepod) 0.26 28.13 Thysanoessa raschii (euphausiid) Mysidacea Mysida (mysid) 0.01 3.13 Hyperiidea (amphipod) Gammaridea (amphipod) Themisto sp.
Deep-sea medusae (Cnidaria: Cubozoa, Hydrozoa and Scyphozoa) from the coast of Bahia (western South Atlantic, Brazil).
Since Metchnikoff's (1893) classic demonstration of a foreign-body response in Scyphozoa (translucent jellyfish), we have made little additional progress in identifying the primary immune cells in cnidaria in general--hydrozoa, anthozoa, schyphozoa, and cubozoa.
Belonging to the macro and mega-zooplankton, medusoid forms such as Hydrozoa, Scyphozoa and Cubozoa are only eventually registered in common zooplankton samples due to the size of individuals and their low density.
The organization and structure of nerve and muscle in the jellyfish Cyanea capillata (Coelenterata; Scyphozoa).
Medusae (Hydrozoa, Scyphozoa, Cubozoa) of the Benguela Current (southeastern Atlantic).
Lipid variation in oocytes of the jellyfish Stomolophus meleagris (Scyphozoa: Rhizostomeae) from Las Guasimas Lagoon, Mexico, during gonadal development.