Rhizostomeae

Rhizostomeae

[‚rī·zə′stō·mē‚ē]
(invertebrate zoology)
An order of the class Scyphozoa having the umbrella generally higher than it is wide with the margin divided into many lappets but not provided with tentacles.
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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.
The Discomedusae includes the order Semaeostomeae, which is now confirmed to be paraphyletic with respect to the other discomedusan order, Rhizostomeae (Bayha et al.
Morphologic and molecular redescription of Catostylus mosaicus conservativus (Scyphozoa, Rhizostomeae, Catostylidae) from southeast Australia.
However, recent phylogenetic analyses of Cnidaria based on morphology (Marques and Collins, 2004) and molecular data (Collins, 2002) suggest that Stauromedusae is not more closely related to the scyphozoan taxa Coronatae, Rhizostomeae, and Semaeostomeae (herein united as Scyphozoa, following Marques and Collins, 2004) than it is to Cubozoa or Hydrozoa.
By comparison to medusozoan outgroups--particularly Cubozoa and the scyphozoan taxa Coronatae, Rhizostomeae, and Semaeostomeae--characters by which we recognize Stauromedusae can be sorted into likely synaporphies and symplesiomorphies (Fig.