Rhizostomae
Encyclopedia
Rhizostomae or Rhizostomeae is an order
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 of jellyfish
Jellyfish
Jellyfish are free-swimming members of the phylum Cnidaria. Medusa is another word for jellyfish, and refers to any free-swimming jellyfish stages in the phylum Cnidaria...

. Species of this order have neither tentacle
Tentacle
A tentacle or bothrium is one of usually two or more elongated flexible organs present in animals, especially invertebrates. The term may also refer to the hairs of the leaves of some insectivorous plants. Usually, tentacles are used for feeding, feeling and grasping. Anatomically, they work like...

s 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 scyphozoa
Scyphozoa
Scyphozoa is a class within the phylum Cnidaria, sometimes referred to as the "true jellyfish".The class name Scyphozoa comes from the Greek word skyphos , denoting a kind of drinking cup and alluding to the cup shape of the organism....

ns, 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 pore
Pore
- Animal biology and microbiology :* Sweat pore, an anatomical structure of the skin of humans used for secretion of sweat* Canal pore, an anatomical structure that is part of the lateral line sense system of some aquatic organisms...

s that are linked to coelenteron.

Families

  • Suborder: Daktyliophorae
    • Catostylidae
      Catostylidae
      Catostylidae is a family of small jellyfish. Members of this family are characterized by their thick, sausage-like oral arms.-Description:Members of the Catostylidae family are small marine jellyfish with domed bells. The eight short oral arms are broad and three-sided...

    • Lobonematidae
    • Lychnorhizidae
    • Rhizostomatidae
    • Stomolophidae
      Stomolophidae
      Stopmolophidae is a family of jellyfish.-Species:*Nemopilema nomurai - Nomura's jellyfish*Stomolophus meleagris - the cannonball or cabbage head jellyfish...

  • Suborder: Kolpophorae
    • Cassiopeidae
    • Cepheidae
      Cepheidae
      Cepheidae is a family of jellyfish....

    • Mastigiidae
    • Thysanostomatidae
    • Versurigidae
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