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).