Fionoidea

Fionoidea is a superfamily of small sea slugs, aeolid nudibranchs. They are gastropod mollusks within the infraorder Cladobranchia. The families within Fionoidea were shown to be monophyletic on DNA evidence and a re-interpretation of family characteristics was provided.

Families
Families within the superfamily Fionoidea are as follows:
 * Family Abronicidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
 * Family Apataidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
 * Family Calmidae Iredale & O'Donoghue, 1923
 * Family Cumanotidae Odhner, 1907
 * Family Cuthonellidae Miller, 1971
 * Family Cuthonidae Odhner, 1934
 * Family Embletoniidae Pruvot-Fol, 1954
 * Family Eubranchidae Odhner, 1934
 * Family Fionidae Gray, 1857
 * Family Flabellinidae Bergh, 1889
 * Family Murmaniidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
 * Family Paracoryphellidae M. C. Miller, 1971
 * Family Pinufiidae Er. Marcus & Ev. Marcus, 1960
 * Family Samlidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
 * Family Tergipedidae Bergh, 1889
 * Family Trinchesiidae F. Nordsieck, 1972
 * Family Unidentiidae Millen & Hermosillo, 2012