Geryonia Péron & Lesueur, 1810

Schuchert, Peter & Collins, Richard, 2021, Hydromedusae observed during night dives in the Gulf Stream, Revue suisse de Zoologie 128 (2), pp. 237-356 : 336

Genus Geryonia Péron & Lesueur, 1810

Geryonia Péron & Lesueur, 1810: 329 , type species Geryonia hexaphylla Péron & Lesueur, 1810 .

Carmarina Haeckel, 1864b: 466 ; type species Carmarina hastata Haeckel, 1864 by monotypy.

Geryones Haeckel, 1879: 293 ; type species Geryones elephas Haeckel, 1879 by monotypy.

Carmaris Haeckel, 1879: 296 , no type species designated.

Diagnosis: Limnomedusae with gastric peduncle; stomach small, with 6 lips; 6 radial canals, with additional centripetal canals; 6 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: Geryonia hexaphylla Péron & Lesueur, 1810 , a synonym of Medusa proboscidalis Forsskål, 1775 , was selected by Haeckel (1879) as type of the genus. Mayer (1910: 424) and Kramp (1961) give as type species Medusa proboscidalis Forsskål, 1775 for this genus, but this is incorrect as the name was not part of the original nominal species included in Geryonia by Péron & Lesueur.