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 Hydroid colonial, mobile, when mature floating on water surface, with a chitinous internal skeleton, forming a floating chamber, covered by mantle, hydranths polymorphic on underside of float, one central, large, atentaculate gastrozooid; surrounded by gastro-gonozooids and dactylozooids; tentacles capitate or reduced to nematocyst patches.
Medusa with evenly-rounded bell; four or eight radial canals and an equal number of exumbrellar nematocystcyst tracks containing stenoteles, nematocyst tracks originating from marginal bulbs; circular canal present; manubrium short, conical; mouth circular; gonads perradial or irregularly arranged perradially and interradially; two opposite thin marginal tentacles terminating in large spherical nematocyst knob, with or without an additional adaxially oriented short tentacle developed from tentaculiferous bulbs; two or six small marginal bulbs without tentacles; ocelli lacking; cndome comprising spherical stenoteles, macrobasic euryteles and atrichous haplonemes; zooxanthellae generally present. [details]