Cuthonellidae is a family of nudibranchs, shell-less marine gastropod molluscs or sea slugs, within the superfamily Fionoidea.
Taxonomic history This family was reinstated as a result of a molecular phylogenetics study.
Genera Genera within the family Cuthonellidae include:Bouchet, P. (2025) Cuthonellidae M. C. Miller, 1977 Accessed through: World Register of Marine Species on 2026-03-06 Cratenopsis Lemche, 1935 Cuthonella Bergh, 1884 Fiocuthona Martynov, 1992 Margina Martynov and Korshunova, 2025 Nella Martynov and Korshunova, 2025 Penistella Martynov and Korshunova, 2025 Victima Martynov and Korshunova, 2025
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