Rhizostomeae is an order of jellyfish. Species of this order have neither nor other structures at the bell's edges. Instead, they have eight highly branched oral arms, along which there are suctorial minimouth orifices. (This is in contrast to other , which have four of these arms.) These oral arms become fused as they approach the central part of the jellyfish. The mouth of the animal is also subdivided into minute that are linked to coelenteron.
Edible jellyfish
Jellyfish species fished on a commercial basis for human consumption (both as a delicacy and for use in traditional medicine) are all from this order
[López-Martínez; and Álvarez-Tello (2013). The jellyfish fishery in Mexico. Agricultural Sciences 4(6A): 57-61.] and include members of the families
Catostylidae,
Lobonematidae,
Rhizostomatidae and
Stomolophidae.
[Miura; Miura; and Park (2006). Collagen as the Major Edible Component of Jellyfish (Stomolophus nomural). Journal of Food Science 48(6): 1758–1760.][Kitamura; and Omori (2010). Synopsis of edible jellyfishes collected from Southeast Asia, with notes on jellyfish fisheries. Plankton Benthos Res 5(3): 106–118.][Omori; and Kitamura (2004). Taxonomic review of three Japanese species of edible jellyfish (Scyphozoa: Rhizostomeae). Plankton Biol. Ecol. 51(1): 36–51.] The jellyfish are typically dried and/or salted.
[ In China, which was the first country documented to use jellyfish as food, this has been practiced at least since the year 300 Common Era,][ but they are also commonly consumed in Japan (the largest consumer of jellyfish today), Korea and southeast Asia.][ Several countries outside Asia have also started catching and exporting these in recent decades.][
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Taxonomy
, there were 92 recognized Extant taxon species in Rhizostomeae.[Daly, Brugler, Cartwright, Collins, Dawson, Fautin, France, McFadden, Opresko, Rodriguez, Romano & Stake (2007). The phylum Cnidaria: A review of phylogenetic patterns and diversity 300 years after Linnaeus. Zootaxa 1668: 127–182] These belong in the following families:
Image:Cassiopea andromeda 2.JPG| Cassiopea andromeda, a Cassiopeidae (upside-down jellyfish)
Image:Blue Blubber Jellyfish IMGP2102.JPG| Catostylus mosaicus, a Catostylidae
Image:Cauliflour Jellyfish, Cephea cephea at Marsa Shouna, Red Sea, Egypt SCUBA.jpg| Cephea cephea, a Cepheidae
Image:Spotted-jellyfish-af.jpg| Mastigias papua, a Mastigiidae
Image:Rizostoma pulmo.jpg| Rhizostoma pulmo, a Rhizostomatidae
Image:Stomolophus meleagris.jpg| Stomolophus meleagris, a Stomolophidae
Image:Thysanostoma loriferum Maldives.JPG| Thysanostoma loriferum, a Thysanostomatidae
