scyphozoan


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scyphozoan

any marine medusoid COELENTERATE of the class Scyphoza, containing the jellyfish. The medusa is the dominant and sometimes only phase of the life history, the polyp being small (a SCYPHISTOMA) or absent.
References in periodicals archive ?
Medusozoans include scyphozoans, hydrozoans, and cubozoans, all of which contain muscle cells generally described as elongated cells with contractile myofilaments of either smooth or striated organization (Calgren, 1949).
The frequent problems related to the identification of Aurelia species could also affect the number of scyphozoan species presented in the study region.
Bischoff (1989) analysed the phylogenetic affinities of byroniids in detail and came to a conclusion that the tube and attachment disks of byroniids are most similar to the attached thecae of the polypoid stage of coronate scyphozoans. Byronida has recently been considered as an entirely extinct order of thecate scyphozoans (Bischoff 1989; Holmer 2004; Wrona 2004; van Iten et al.
In the more traditional sense, Lucas says, the term "jellyfish" applies just to the watery species in the stinging cnidarians, and she sometimes narrows even further to a subgroup called scyphozoans. A fine example is the moon jelly (Aurelia aurita) which stars in much of Lucas' research at the University of Southampton in England.
A fifth possible deposit exists in coeval strata of southern New Brunswick, in which more than a hundred discoidal to radial structures occur; these were informally described and hypothesized to represent composite molds of scyphozoan medusae (Pickerill 1982, 1990).
Box jellyfish differ from the majority of scyphozoan jellyfish that possess a bentho-pelagic life cycle, which is defined by a sessile polyp stage that metamorphoses into one or more free-swimming medusae.
Diet composition of the large scyphozoan jellyfish Chrysaora plocamia in a highly productive upwelling center of northern Chile.
The subumbrellar swim musculature of scyphozoan jellyfish presents an interesting problem for neuronal control due to several unique features.
This removes a potential source of peripheral variability since the scyphozoan Diffuse Nerve Net is capable of modulating swim muscle contractility (Horridge, 1956a, b; Passano, 1973).
Larger scyphozoan medusae such as Aurelia aurita achieve greater absolute swimming speeds, and they do so via reduced pulse frequencies (McHenry and Jed, 2003).
GPCRs also facilitate metamorphosis in the scyphozoan Cassiopea andromeda (Hofmann et al., 1984, 1996; Fitt and Hofmann, 1985; Fitt et al., 1987; Hofmann and Brand, 1987).
Table 1 Cnidarian jellyfish species used for feeding experiments of phyllosoma larvae Class Order Species Number of Experiments Scyphozoa* Semaeosiomeae Aurelia aurita > 10 Aurelia aurita > 10 (ephyraev and young medusae) Chrysaora pacifiea > 10 Sanderia malayensis 4 Rhizostomeae Mastigias papua 2 Nemopilema nomurai Hydrozoa Anthomedusae Nemopsis dofleini 4 Spirocodon saltalor > 10 Velella velella 1 Leptomedusae Aequorea S coerulescens Siphonophorae Physalia physafis 1 Cubozoa Cubomedusae Carybdea rastoni 2 * Bell diameters of scyphozoan medusae used for the examinations ranged from 30 to 100 mm.