Bougainvilliidae is a family of marine hydroids in the class Hydrozoa. Members of the family are found worldwide. There are sixteen accepted genera and about ninety-three species.
Pandeidae is a family of hydroids in the class Hydrozoa. Like other jellyfish there is usually a mature medusa form which is pelagic and reproduces sexually and a hydroid or polyp form which is often benthic and reproduces asexually by budding.
Cuninidae is a family of hydrozoans in the order Narcomedusae. They have dome-shaped bells and tentacles set above the undulating margin of the bell. Their gastric pouches contain the gonads situated in line with the tentacles, the number of pouches being the same as the number of tentacles. The pouches do not extend below the points of origin of the primary tentacles. Members of some genera have a peripheral canal system and others do not. No radial canals or secondary tentacles are present.
Corynidae is a family of hydrozoans in the order Anthomedusae.
Hydractiniidae is a cnidarian family of athecate hydroids.
Aequorea is a genus of pelagic hydrozoans in the family Aequoreidae.
Ectopleura is a genus of hydrozoans in the family Tubulariidae.
Sertulariidae is a family of hydrozoans.
Filifera is a suborder of hydrozoans in the order Anthoathecata. They are found in marine, brackish and freshwater habitats.
Aplanulata is a suborder of Hydrozoa, a class of marine and freshwater invertebrates belonging to the phylum Cnidaria. The group have lost its planula larval stage, and the only remnants of the medusa stage is when they functions as gonophores attached to the polyp.
Sarsia is a genus of hydrozoan in the family Corynidae.
Stauridiosarsia is a genus of hydrozoans in the family Corynidae.
Corymorphidae is a family of hydroid cnidarians. For long placed in a presumed superfamily or infraorder Tubulariida of suborder Capitata, they are actually close relatives of the Hydridae and are now united with these and a number of relatives in a newly recognized suborder Aplanulata. Most, if not all species in this family grow on stalks and resemble small flowers.
Corymorpha is a genus of hydrozoans in the family Corymorphidae.
Ptilocodiidae is a family of hydrozoans in the order Anthoathecata.
Phialella is a genus of hydrozoans. It is the only genus within the monotypic family Phialellidae.
Eirene is a genus of hydrozoans in the family Eirenidae.
Octophialucium is a genus of Hydrozoan in the family Malagazziidae. The genus contains bioluminescent species.
Zanclea is a genus of hydrozoans belonging to the family Zancleidae.
