Daktyliophorae

Rhizostomatidae is a family of cnidarians in the class Scyphozoa.

Catostylidae, the fat-arm jellies, is a family of jellyfish. Members of this family are characterized by their thick, sausage-like oral arms. Members of the family Catostylidae are small marine jellyfish with domed bells. The eight short oral arms are broad and three-sided. These jellies do sting but usually only leave minor burns.

Lychnorhizidae is a family of true jellyfish.

Stomolophus is a genus of true jellyfish from the West Atlantic and Pacific. It is the only genus in the monotypic family Stomolophidae. Formerly, Nomura's jellyfish (Nemopilema nomurai) was also included in this genus, but has now been reclassified to the family Rhizostomatidae.

Lobonematidae is a family of jellyfishes belonging to the order Rhizostomeae.