Scyphomedusae


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Scyphomedusae

[¦sī·fō·mə′dü‚sē]
(invertebrate zoology)
A subclass of the class Scyphozoa characterized by reduced marginal tentacles, tetramerous medusae, and medusalike polyploids.
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 It might be outdated or ideologically biased.

Scyphomedusae

 

individuals of the medusoid (sexually reproducing) generation of coelenterates of the class Scyphozoa. The umbrella, which may be flat or bell-shaped, is semitransparent and often brightly colored or with colored markings. The margins of the mouth are drawn out into four mouth arms, which are sometimes branched. There are often four, eight, or 16 simple or branching radial canals of the digestive system and a ringshaped canal. The margin of the umbrella has eyespots, statocysts, and, in many cases, marginal tentacles. The umbrella varies in diameter from several centimeters to 2 meters (in Cyanea). All Scyphomedusae except those of the order Stauromedusae live deep in the ocean and are capable of swimming. [25–376–1 ]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Dense aggregations of jellyfish (Scyphomedusae), primarily Chrysaora fuscescens, C.
Relative predation potentials of scyphomedusae, ctenophores and planktivorous fish on ichthyoplankton in Chesapeake Bay.
Report upon the scyphomedusae collected by the United States Bureau of Fisheries steamer "Albatross" in the Philippine Islands and Malay Archipelago.
Recent morphological evidence supports the presence of two separate nerve nets in the subumbrella of scyphomedusae (e.g., Anderson and Schwab, 1981; Anderson et al., 1992; Carlberg et al., 1995).
In cubomedusae, the FMRFamidergic system in the subumbrella is almost exclusively contained within the rhopalia and nerve ring, without the diffuse nerve net organization seen in scyphomedusae (Satterlie, 2002, 2011).
In situ observations of the association between juvenile fishes and scyphomedusae in the Bering Sea.
- - - Proboscidactyla 91 4.8 1.0 ornata Proboscidactyla 17 0.9 0.2 stellata Rophalonema velatum 475 25.0 5.4 Sarsia coccometra 4 0.2 0.1 Solmundella 278 14.6 3.1 bitentaculata Total 8652 Scyphomedusae Chrysaora plocamia * - - - Ephyrae 21 1.1 0.2 Spring Species Frequency Total abundance Mean abundance (%) (ind 1000 (ind 1000 [m-.sup.3]) [m-.sup.3]) Hydromedusae Amphinema rugosum - 221 9.6 Amphogona apicata 42 9242 401.8 Bougainvillia - 170 7.4 macloviana * Bougainvillia 84 43752 1902.3 muscoides Bougainvillia 74 4893 212.7 muscus Bougainvillia sp.
The Utility of the Nematocysts in the Classification of Certain Scyphomedusae. C.
It could be because they display a horizontal diurnal migration pattern like some hydro- and scyphomedusae (Hamner and Hauri, 1981; Arkett, 1989; Hamner et al., 1994) and that they leave the nearshore area during the day to remain active in another habitat.
Similar observations have been made for scyphomedusae that develop from ephyrae, characterized by bells with large clefts separating lappets, into adults with continuous bell morphologies (Higgins et al., 2008; Feitl et al., 2009).
A different perspective on the taxonomic richness and distribution of scyphomedusae is emerging from molecular phylogenetic analyses.