colonial hydriod, with sporosacs, grows grows on shells of Hinia incrassata (Müller), either inhabited by the ... [details]
This species occurs on shells of Cavolinia tridentata (Forsskål, 1775), the original identification of Chun ... [details]
Colonies stolonal or erect, with perisarc enveloping hydranth and extending as a sheath over proximal ends of ... [details]
Hydroid colony stolonal or branched, more rarely hydranths sessile; perisarc terminating at base of hydranth or ... [details]
Medusa jelly thick; no peduncle, basal trunk of oral tentacles long, ocelli crescentic or oval, often appearing ... [details]
Hydroids solitary or colonial; hydranths stolonal, branched, or rarely sessile, arising from creeping hydrorhiza; ... [details]
Colonial hydroids, branched or not, perisarc not ensheathing bases of tentacles; hydranth with one whorl of ... [details]
Hydroid colony stolonal, living on pelagic gastropods; polyps polymorphic with gastrozooids and dactylozooids; ... [details]
Hydroids colonial, stolonal or branching, covered by perisarc infested with foreign material; filmy perisarc also ... [details]
Medusa mostly with an apical projection of variable size. Manubrium voluminous, connected to radial canals by ... [details]
Rathkeidae medusa with four or eight simple, unbranched perradial oral tentacles inserting at level of mouth rim; ... [details]
Hydroids, solitary, small, club-shaped, with pedal disk, hydrocaulus not distinctly delimited from hydranth body, ... [details]
Rathkeidae medusa with four radial canals; eight marginal tentacle bulbs, all with two or more tentacles; the four ... [details]
Medusa bell-shaped, manubrium either with four elongated lips forming simple or branched oral arms with terminal ... [details]
A northern boreal medusa occurring in coastal areas from the Barents Sea to the English Channel and the North Sea. ... [details]
West Indies, mid-Atlantic, Azores, Portugal, Madagascar (Kramp, 1957b) [details]
Genus Codonorchis is unrecognizable, Haeckel observation of ocelli is unreliable (see Schuchert, 2007) [details]
According to Schuchert (2007: 224) Cyanea Bougainvillii is a simultaneous synonym of Bougainvillia macloviana - ... [details]
KEY TO THE GENERA OF THE BOUGAINVILLIIDAE: see Schuchert (2007) [details]
The original spelling by Brandt (1837: 187) was Rathkia, later corrected to Rathkea by Haeckel (1879: 96). The name ... [details]
An indeterminate species, could be Amphinema rugosum or A. dinema (see Rees, 1956a). [details]
An indeterminate species, could be a Rhizorhagium species [details]
An unrecognizable species, likely a synonym (aberrant form) of Rathkea octopunctata [details]
Nigritina atlantica Steenstrup. – Kramp, 1961: 64, name not available. Cytaeis tetrastyla Eschscholtz, 1829: ... [details]
Perigonimus schneideri Motz-Kossowska, 1905: 72, fig. 6i. – Rees, 1956a: 344. ? Perigonimus steinachi ... [details]
The first complete life cycle of a Hydrichthys hydroid was revealed by Larson (1982). He could identify the ... [details]
Taxonomic position unclear, adult medusa unknown. [details]
The genus Lizzia was transferred to the Family Rathkeidae based on 16S DNA data [details]
Likely belongs to the genus Bougainvillia. [details]
perhaps the polyp of Halitholus cirratus Hartlaub, 1914 [details]
Mediterranean Sea near Otranto, Apulia, Italy [details]
Western Greenland, Egedesminde (Aasiaat) [details]
Type liocality not specified, Hartlaub had material from Svalbard, the Barent Sea, the Baltic Sera and the North Sea [details]
Southwest of Ireland, on copepod parasitizing the deep sea fish Benthosema glaciale [details]
Tropical western Atlantic Ocean; WGS84 20.65, - 61.80; 300 m wire out; on pteropod gastropod Diacria trispinosa ... [details]
coastal waters around Bergen, Norway [details]
When Forbes (1846: 286) defined the genus Lizzia he stated «..founded for Cytaeis octopunctata of Sars...». This ... [details]
Podocoryne alderi Hodge, 1863 is synonym of B. muscus (medusa only). [details]
unrecognizable species, likely a synonym of Rathkea octopunctata [details]
See Schuchert (2007: 359) why this combination is not valid. [details]