Hydromedusae observed during night dives in the Gulf Stream Author Schuchert, Peter Muséum d’histoire naturelle, C. P. 6434, CH- 1211 Genève 6, Switzerland peter.schuchert@ville-ge.ch Author Collins, Richard 880 NE 33 rd Street, Boca Raton, Florida, USA rc6684@icloud.com text Revue suisse de Zoologie 2021 2021-10-21 128 2 237 356 journal article 3356 10.35929/RSZ.0049 172fa5c5-c0c4-4bd7-b710-d608237b8458 0035-418 5639938 Genus Liriope Lesson, 1843 Liriope Lesson, 1843: 331 ; type species Liriope cerasiformis Lesson, 1843 (Haeckel, 1979: 288) . Xanthea Lesson, 1843: 333 ; type species Xanthea agaricina Lesson, 1843 by monotypy. Leuckartia L. Agassiz, 1862: 364 ; type species Leuckartia proboscidalis L. Agassiz, 1862 by monotypy . Glossocodon Haeckel, 1864b: 460 ; type species Liriope eurybia Haeckel, 1864 by monotypy. Glossocodon ( Glossoconus ) Haeckel, 1864b: 461 ; no type species designated. Liriantha Haeckel, 1879: 286 , no type species designated. Liriantha ( Lirianthella ) Haeckel, 1879: 286 ; no type species designated. Liriantha ( Lirianthissa ) Haeckel, 1879: 287 ; no type species designated. Liriope ( Liriopella ) Haeckel, 1879: 289 ; no type species designated. Liriope ( Liriopissa ) Haeckel, 1879: 290 ; no type species designated. ? Pentaradiata Zamponi & Gezano, 1989: 34; type species Pentarradiata estuariensis Zamponi & Genzano, 1989 by monotypy. ? Heptarradiata Zamponi & Gezano, 1989: 35 ; type species Heptarradiata rioplatensis Zamponi & Genzano, 1989 by monotypy. ? Octorradiata Zamponi & Gezano, 1989: 36 ; type species Octorradiata bonaerensis Zamponi & Genzano, 1989 by monotypy. Diagnosis: Limnomedusae with long gastric peduncle; stomach small, with 4 lips; 4 radial canals, with additional centripetal canals; 4 gonads on radial canals, flattened and leaf-shaped; two kinds of marginal tentacles, solid and hollow; ecto-endodermal statocysts enclosed in mesoglea. No polyp stage, direct developement. Remarks: Rarely, aberrant animals with more than four radial canals and gonads can occur, but the number of oral lips remains rather constantly four ( Bouillon et al ., 2006 ).