Rhizostome

Rhiz´o`stome


n.1.(Zool.) One of the Rhizostomata.
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A podocyst is an encapsulated dormant stage produced beneath the pedal disc of the polyps of many rhizostome and semaeostome jellyfish species (Arai, 2009).
However, it remains to be studied whether dormant podocysts of other rhizostome species are also devoid of nematocysts.
Among semaeostome and rhizostome taxa, medusae of all life stages spend the majority of time swimming (Costello et al.
Two medusae new to the coast of California: Carybdea marsupialis (Linnaeus, 1758), a cubomedusa and Phyllorhiza punctata von Lendenfeld, 1884, a rhizostome scyphomedusa.
Two medusae new to the coast of California: Carybdea marsupialis (Linneaeus, 1758), a cubomedusa and Phyllorhiza punctata von Lendenfeld, 1884, a rhizostome scyphomedusa.
The generality of this last feature is somewhat tentative as it has been studied in only a single species, but it is dramatically different from what has been observed in coronates, rhizostomes, and semaeostomes (Eckelbarger and Larson, 1993).
Swimming frustules are produced in some species (hydroid example: Craspedacusta; scyphozoan example: certain rhizostomes such as Cassiopeia and Mastigias), and these can be pipetted into a dish where they will settle and develop int o polyps.