Hydrozoan genera

genus of cnidarians

Dendrogramma enigmatica is a species of siphonophore, the only one in its genus. It has been first described in 2014 on the basis of its morphology from a collection of specimens gathered in 1986. Its taxonomic affinity among animals was then unclear, but RNA from new specimens in 2016 allowed it to be identified as a siphonophore by barcoding and phylogenomics. The specimens are presumed to represent parts (bracts) of an entire siphonophore that has not been identified yet.

Physalia is a genus of hydrozoan cnidarians within the monotypic family Physaliidae, commonly known as '''man o' wars or bluebottles'. They are siphonophores, colonial organisms composed of specialized individual zooids that function together as a single unit. Unlike most siphonophores, which are planktonic, Physalia'' species are neustonic, living at the ocean-air interface.

Turritopsis is a genus of hydrozoans in the family Oceaniidae.

Craspedacusta is a genus of freshwater hydrozoans in the family Olindiidae. Like all members of that family, they have a polyp phase and a medusa phase.

thumb|Crystal Jelly (Aequorea sp) swimming Aequorea is a genus of pelagic hydrozoans in the family Aequoreidae.

Hydractinia is a genus of commensal athecate hydroids which belong to the family Hydractiniidae. Hydractinia species mostly live on hermit-crabbed marine gastropod shells.

Stylaster is a genus of hydroids in the family Stylasteridae.

Tubularia is a genus of hydroids resembling furry pink tufts or balls at the end of long strings, spawning the common name as either the pink-mouthed or pink-hearted hydroid.

Olindias is a genus of hydrozoans in the family Olindiidae.

Eudendrium is a large genus of hydroids (Hydrozoa), one of two in the family Eudendriidae. These animals are marine cnidarias in the family Eudendriidae.

Campanularia is a genus of hydrozoans, in the family Campanulariidae.

Marrus is a genus of siphonophores. Species include:

Porpita is genus of hydrozoans in the family Porpitidae. It has two species recognized and is the type genus of its family.

Sertularia is a genus of hydroids in the family Sertulariidae.

Crossota is a genus of hydrozoans of the family Rhopalonematidae. The genus comprises five species. Unlike most hydromedusae, these do not have a sessile stage. Rather, they spend their entire lives in the water column as plankton. The genus Crossota is widespread throughout the oceans.

Aglaophenia is a genus of hydrozoans in the family Aglaopheniidae.

Distichopora is a genus of hydrozoans belonging to the family Stylasteridae.

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

Monobrachium is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae.

Limnocnida is a genus of hydrozoans belonging to the family Olindiidae.

Bougainvillia is a genus of hydroids in the family Bougainvilliidae in the class Hydrazoa. Members of the genus are characterised by having the marginal tentacles of their medusae arranged in four bundles. Some species are solitary and others are colonial but all are filter feeders. They are found in the Southern Ocean, having a circumpolar distribution, but some species also occur in the Northern Hemisphere, possibly travelling there as polyps on the hulls of ships.

Gonionemus is a genus of hydrozoans that use adhesive discs near the middle of each tentacle to attach to eelgrass, sea lettuce, or various types of algae instead of swimming. They are small (bell diameter to 25 mm) and hard to see when hanging onto swaying seaweed. Nevertheless, they are capable of swimming when necessary. The bell is transparent, revealing the four orange to yellowish-tan gonads that lie along most of the length of the four radial canals. The pale yellow manubrium has four short, frilly lips. Up to 80 tentacles line the bell margin, with about an equal number of statocy

Botrynema is a genus of hydrozoans in the family Halicreatidae.

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

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

Sarsia is a genus of hydrozoan in the family Corynidae.

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

Erenna is a genus of cnidarians belonging to the family Erennidae.

Antennella is a genus of hydrozoans belonging to the family Halopterididae.

Zyzzyzus is a genus of marine tubulariid hydrozoans, which grow embedded in sponges.

Orchistoma is a genus of hydrozoans in the order Leptothecata. It is the only genus in the monotypic family Orchistomatidae.

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

Pennaria is a genus of hydrozoans. It is the only genus within the monotypic family Pennariidae.

Schizotricha is a genus of cnidarians belonging to the monotypic family Schizotrichidae.

Corymorpha is a genus of hydrozoans in the family Corymorphidae.

Otohydra is a genus of cnidarians belonging to the monotypic family Otohydridae.

Zanclea is a genus of hydrozoans belonging to the family Zancleidae.

Zygophylax is a genus of cnidarians belonging to the family Zygophylacidae.

Rathkea is a genus of cnidarians belonging to the family Rathkeidae.

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

Inferiolabiata is a genus of hydrozoans belonging to the family Stylasteridae.

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

genus of cnidarians

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

Eutima is a genus of hydrozoans in the family Eirenidae.

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

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

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

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

genus of cnidarians

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

genus of cnidarians

genus of cnidarians

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

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).

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

Hydrodendron is a genus of cnidarians belonging to the monotypic family Phylactothecidae.

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

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