Leptothecata

order of cnidarians Leptothecata (Leptothecata) is an order comprising closely related families of organisms. It contains 13 families with 35 known species. Key family groups include Aequoreidae, Aglaopheniidae, Blackfordiidae, Campanulariidae, Campanulinidae, and Eirenidae. It belongs to Hydrozoa (Hydrozoa).