basis of record
Bouillon, J.; Boero, F. (2000). Synopsis of the families and genera of the Hydromedusae of the world, with a list of the worldwide species. <i>Thalassia Salent. 24</i>: 47-296 (look up in IMIS) [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Diagnosis Hydroids solitary, hydrocaulus long, hollow or more or less filled with parenchymatic gastrodermis, lower part of caulus with short papillae or/and longer anchoring filaments; tentacles arranged into two separate sets; oral tentacles composed either of one whorl of moniliform, one whorl of capitate tentacles, or several whorls of filiform tentacles; aboral tentacles arranged in one to three whorls of moniliform or filiform tentacles; gonophores borne above aboral tentacles, either directly issuing from hydranth wall or on blastostyles, gonophores develop into free medusae or fixed sporosacs.
Medusa with or without apical projection; manubrium usually not extending beyond umbrella margin, cylindrical or exceptionally with sac-like processes; mouth simple, circular; gonads undivided surrounding manubrium completely over its entire length, exceptionally also on sac-like processes of manubrium; one to four hollow, usually filiform tentacles, tentacles all uniform or differentiated into two types, differing in size and structure, tentacles exceptionally branched or rudimentary. [details]