Flabellinidae is a family of nudibranchs, shell-less marine gastropod molluscs or sea slugs, in the superfamily Flabellinoidea.

Genera According to Korshunova et al. (2025), genera within the family Flabellinidae include: Calmella Eliot, 1910 Carronella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 Coryphellina O'Donoghue, 1929 Edmundsella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 Flabellina Gray, 1833 in Griffith and Pidgeon, 1833–34 Paraflabellina Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017

In Ekimova et al. (2026), Coryphellidae and Paracoryphellidae were considered synonymous of Flabellinidae and several genera were lumped with each other, proposing the following list of genera: Chlamylla Bergh, 1886 [= Paracoryphella Miller, 1971; = Polaria Korshunova et al., 2017] Coryphella J. E. Gray, 1850 [= Corrupta Korshunova et al., 2025; = Portorchardia Korshunova et al., 2025] Coryphellina O’Donoghue, 1929 Edmundsella Korshunova et al., 2017 Flabellina McMurtrie, 1831 [= Calmella Eliot, 1910; = Carronella Korshunova et al., 2017; = Paraflabellina Korshunova et al., 2017] Launsina Ekimova et al., 2026 Mgueolia Korshunova, Fletcher & Martynov, 2025 Ziminella Korshunova et al., 2017

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