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

References