Fionoidea is a superfamily of nudibranchs, shell-less marine gastropod molluscs or sea slugs, in the suborder Aeolidacea. The families within Fionoidea were shown to be monophyletic on DNA evidence and a re-interpretation of family characteristics was provided.
Families In 2017, Bouchet and colleagues listed the following families inside Fionoidea: Family Calmidae Iredale & O’Donoghue, 1923 Family Cuthonellidae M. C. Miller, 1977 Family Cuthonidae Odhner, 1934 Family Eubranchidae Odhner, 1934 Family Fionidae Gray, 1857 Family Lomanotidae Bergh, 1890 Family Pinufiidae Er. Marcus & Ev. Marcus, 1960 Family Tergipedidae Bergh, 1889 Family Trinchesiidae F. Nordsieck, 1972
2025 revision A 2025 revision of the taxonomy of Aeolidacea by Korshunova and colleagues recognised, based on the results of molecular phylogenetic analysises, the following families in the superfamily Fionoidea: Family Abronicidae Family Calmidae Family Cuthonellidae Family Cuthonidae Family Eubranchidae Family Fionidae Family Murmaniidae Family Tergipedidae Family Trinchesiidae Family Xenocratenidae
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