Flabellinoidea is a superfamily of nudibranchs, shell-less marine gastropod molluscs or sea slugs, in the suborder Aeolidacea.
Families According to Korshunova and colleagues (2025), the following genera are recognised in the superfamily Flabellinoidea: Family Coryphellidae Bergh, 1889 Family Flabellinidae Bergh, 1889 Family Paracoryphellidae Miller, 1971
Ekimova et al. (2026) considers Coryphellidae and Paracoryphellidae to be synonyms of Flabellinidae. Ekimova I., Carmona L., Mikhlina AL., Grishina D., Stanovova M.V., Schepetov D.M., Hoover C., de Souza-Canal J., Kuznetsov K.O., Valdés A.; (2026). Neither "lumpers" nor "splitters": A global revision of Flabellinidae s.l. nudibranchs (Gastropoda: Heterobranchia: Nudibranchia). PLoS One 21(5): e0347759.
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