Geryoniidae

The Geryoniidae are a family of hydrozoans in the order Trachymedusae.

species of cnidarian

genus of cnidarians

Geryonia is a monotypic genus of hydrozoans in the family Geryoniidae. It is represented by the species Geryonia proboscidalis which occurs in the Mediterranean and subtropical seas. In the Mediterranean the species is more numerous and the polyps are larger than in other parts of the world. The diameter of a polyp can be up to 80 mm, while in Florida and the Bahamas it is rare to find specimens of more than 50 mm in diameter.