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

According to Korshunova and colleagues (2025), the following genera are recognised in the superfamily Fionoidea:

  • Family Abronicidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
  • Family Calmidae Iredale & O'Donoghue, 1923
  • Family Cuthonellidae Miller, 1971
  • Family Cuthonidae Odhner, 1934
  • Family Eubranchidae Odhner, 1934
  • Family Fionidae Gray, 1857
  • Family Murmaniidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
  • Family Tergipedidae Bergh, 1889
  • Family Trinchesiidae F. Nordsieck, 1972
  • Family Xenocratenidae Martynov, Lundin, Picton, Fletcher, Malmber &Korshunova, 2020