Marionia

Marionia is a genus of sea slugs, specifically dendronotid nudibranchs, marine gastropod molluscs in the family Tritoniidae.

== Species == Species within the genus Marionia include: Species brought into synonymy: Marionia affinis Bergh, 1883: synonym of Marionia blainvillea (Risso, 1818) (synonym) Marionia berghii Vayssière, 1879: synonym of Marionia blainvillea (Risso, 1818) (synonym) Marionia occidentalis Bergh, 1884: synonym of Marionia cucullata (Couthouy, 1852) Marionia tethydea [sic]: synonym of Marionia blainvillea (Risso, 1818) (misspelling of thethydea (Delle Chiaje, 1841))