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.

Biology

These jellyfish have 3 layers that make up their bodies. They have an inner gastrodermis

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