Rhizostomae


Rhizostomae or Rhizostomeae is an order of jellyfish. Species of this order have neither tentacles nor other structures at the bell's edges. Instead, they have eight highly branched oral arms, along which there are suctorial minimouth orifices. These oral arms become fused as they approach the central part of the jellyfish. The mouth of the animal is also subdivided into minute s that are linked to coelenteron.

Edible jellyfish

Jellyfish species fished on a commercial basis for human consumption are all from this order and include members of the families Catostylidae, Lobonematidae, Rhizostomatidae and Stomolophidae. 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 CE, but they are also commonly consumed in Japan, Korea and southeast Asia. Several countries outside Asia have also started catching and exporting these in recent decades.

Taxonomy

, there were 92 recognized extant species in Rhizostomeae. These belong in the following families: