Hydrozoan genera

Hydrocoryne is a genus of cnidarians belonging to the family Hydrocorynidae.

Garveia is a genus of cnidarians belonging to the family Bougainvilliidae.

Eutima is a genus of hydrozoans in the family Eirenidae.

Eucheilota is a genus of cnidarians belonging to the family Lovenellidae.

genus of cnidarians

Cordylophora is the sole genus of hydrozoans in the monotypic family Cordylophoridae.

Ectopleura is a genus of hydrozoans in the family Tubulariidae.

Pseudosolanderia is a genus of cnidarians belonging to the monotypic family Pseudosolanderiidae.

genus of cnidarians

Homoeonema platygonon is a species of deep sea hydrozoan of the family Halicreatidae. It is the only species in the monotypic genus Homoeonema.

Perarella is a genus of hydrozoans belonging to the family Cytaeididae.

Tiaropsis is a genus of hydrozoans belonging to the family Tiaropsidae.

Solanderia is the sole genus of hydrozoans in the monotypic family Solanderiidae. They are commonly known as tree hydroids or sea fan hydroids.

Odessia is a genus of cnidarians belonging to the family Moerisiidae.

genus of cnidarians

genus of cnidarians

genus of cnidarians

Athorybia is a genus of cnidarians belonging to the family Agalmatidae.

Staurodiscus is a genus of hydrozoans belonging to the family Hebellidae.

Halitholus is a genus of cnidarians belonging to the family Pandeidae.

genus of cnidarians

Polyorchis, or bell jellies, is a genus of hydrozoans in the family Corynidae. They are transparent with red coloration in their internal organs and eye spots around the rim of their bell. The red pigmentation helps them camouflage. They are often found in harbors, marinas, and other calm waters close to shore. They feed on plankton and benthic crustaceans and are found near the sea floor. The bells can reach about 2.25 inches (5 cm).

Zhangiella is a genus of hydrozoans belonging to the family Australomedusidae.

Lytocarpia is a genus of hydrozoans belonging to the family Aglaopheniidae.

Kirchenpaueria is a genus of cnidarians belonging to the family Kirchenpaueriidae.

Acryptolaria is a genus of hydrozoans in the family Lafoeidae.

Lensia is a genus of hydrozoans belonging to the order Siphonoporae and the family Diphyidae. This genus is colonial and consists of many different types of highly specialized zooids. The genus Lensia was first established in 1932 by Dr. Arthur Knyvett Totton, who would also describe and add another 11 species during his career. As of March 2023, the genus consists of only 26 described and accepted species and an additional seven uncertain species, according to the World Register of Marine Species.

Sphaeronectes is a genus of cnidarians belonging to the family Sphaeronectidae.

genus of hydrozoans

Voragonema is a genus of hydrozoans belonging to the family Rhopalonematidae. The genus comprises four species. Unlike most hydromedusae, these do not have a sessile stage. Rather, they spend their entire lives in the water column as plankton. Centripetal expansions protruding from the ring canal is a characteristic that separates this genus from other genera in the family Rhopalonematidae.

Australomedusa is a genus of hydrozoans belonging to the family Australomedusidae.

Rhysia is a genus of cnidarians belonging to the monotypic family Rhysiidae.

Arctapodema is a genus of deep-sea hydrozoans in the family Rhopalonematidae.

Octophialucium is a genus of hydrozoan in the family Malagazziidae. The genus contains bioluminescent species.

Hybocodon is a genus of cnidarians belonging to the family Tubulariidae, and was first described by Louis Agassiz in 1860.

Ralpharia is a genus of hydrozoans belonging to the family Tubulariidae.

Gastroblasta is a genus of cnidarians belonging to the family Campanulariidae.

Aeginura is a genus of hydrozoans in the family Aeginidae.

Corhiza is a genus of hydrozoans in the family Halopterididae.

Solmaris is a genus of diminutive hydrozoans.

Eutonina is a genus of cnidarians belonging to the family Eirenidae.

Solmissus, or dinner plate jellyfish, is a genus of hydrozoans. Its species are unique among cnidarians in that they actively hunt for prey as opposed to passively waiting for plankton to pass by. They are found in the deep waters of Monterey Bay, California. They are most likely to be found in the deep sea, mid water (). They grow to be in diameter. These hydrozoans feed on gelatinous zooplankton, including salps and doliolids, ctenophores, jellyfish, and copepods. However, Solmissus may be limited to feeding on soft-bodied prey by the type of nematocysts on their tentacles (Mills).

Dictyocladium is a genus of hydrozoans belonging to the family Sertulariidae.

Bathyphysa is a genus of hydrozoan siphonophores within the family Rhizophysidae. It has 3 species: Bathyphysa conifera, Bathyphysa Sibogae, and Bathyphysa japonica. This genus is composed of colonial organisms that consist of specialized zooids and are characterized by an elongated body, lack of swimming bells, and the presence of a gas filled float chamber (pneumatophore). The Bathyphysa species encompass the deep ocean waters and are primarily bathypelagic predators. They typically prey on zooplankton and nekton using tentacles that bear nematocysts for capturing purposes.

Amphogona is a genus of deep-sea hydrozoans of the family of Rhopalonematidae. It has a cosmopolitan distribution in tropical to temperate oceans.

Pycnotheca is a genus of hydroids in the family Kirchenpaueriidae.

Pantachogon is a genus of hydrozoans of the family Rhopalonematidae. The genus includes three species.

Rhopalonema is a genus of deep-sea hydrozoans of the family Rhopalonematidae.

Gonothyraea is a genus of cnidarians belonging to the family Campanulariidae.

genus of Hydrozoa

Coryne is a genus of hydrozoans belonging to the family Corynidae.

Stylactis is a genus of hydrozoans belonging to the family Hydractiniidae.

genus of cnidarians

Angelopsis is a genus of hydrozoans belonging to the family Rhodaliidae.

Lepidotheca is a genus of cnidarians belonging to the family Stylasteridae.

Melicertum is a genus of hydrozoans belonging to the family Melicertidae.

Colobonema is a genus of deep-sea hydrozoans.

Protohydra is a genus of cnidarians belonging to the family Protohydridae.

Halisiphonia is a genus of deep water hydrozoans belonging to the family Hebellidae. There is little known about individual species. This lack of information has resulted from the difficulty of studying members of this genus due to the great depths at which they are located.

Abylopsis is a siphonophore genus in the Abylidae. The genus contains bioluminescent species.