This species is one of the two most frequent and abundant scyphomedusae
in the study region.
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
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.