Fionoidea is a superfamily of aeolidacean nudibranchs. The families within Fionoidea proved to be monophyletic in the molescopic analyzes.

The actual classification of the Fionoidea proposed by Bouchet et al.(2017) and accepted at WoRMS is:
Fionoidea J. E. Gray, 1857
- Abronicidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Abronica Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
- Calmidae Iredale & O’Donoghue, 1923
- Calma Alder & Hancock, 1855
- Coryphellidae Bergh, 1889
- Borealea Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Corrupta Korshunova, Fletcher & Martynov, 2025
- Coryphella J. E. Gray, 1850
- Fjordia Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Gulenia Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Himatina Thiele, 1931
- Itaxia Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Microchlamylla Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Occidenthella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Orienthella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Portorchardia Korshunova, Fletcher & Martynov, 2025
- Cumanotidae Odhner, 1907
- Cumanotus Odhner, 1907
- Cuthonellidae M. C. Miller, 1977
- Cratenopsis Lemche, 1935
- Cuthonella Bergh, 1884
- Fiocuthona Martynov, 1992
- Cuthonidae Odhner, 1934
- Bohuslania Korshunova, Lundin, Malmberg, Picton & Martynov, 2018
- Cuthona Alder & Hancock, 1855
- Eubranchidae Odhner, 1934
- Aenigmastyletus Martynov, 1998
- Amphorina Quatrefages, 1844
- Annulorhina K. P. Rao, 1968
- Capellinia Trinchese, 1873
- Corruptobranchus Martynov & Korshunova, 2025
- Dunga Eliot, 1902
- Eubranchopsis Baba, 1949
- Eubranchulus Martynov & Korshunova, 2025
- Eubranchus Forbes, 1838
- Galvinella Eliot, 1907
- Karavellia Martynov & Korshunova, 2025
- Leostyletus Martynov, 1998
- Nudibranchus Martynov, 1998
- Produnga Martynov, 1998
- Fionidae J. E. Gray, 1857
- Fiona Alder & Hancock, 1853
- Tergiposacca Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
- Zatteria Eliot, 1902
- Magallanidae Ortea & Moro, 2020
- Magallanes Ortea & Moro, 2020
- Murmaniidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Guyvalvoria Vayssière, 1906
- Murmania Martynov, 2006
- Paracoryphellidae M. C. Miller, 1971
- Chlamylla Bergh, 1886
- Paracoryphella M. C. Miller, 1971
- Polaria Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Ziminella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, H. Saito, Lundin, Schrödl & Picton, 2017
- Pinufiidae Er. Marcus & Ev. Marcus, 1960
- Pinufius Er. Marcus & Ev. Marcus, 1960
- Pseudovermidae Thiele, 1931
- Pseudovermis Perejaslavtzeva, 1891
- Tergipedidae Bergh, 1889
- Tergipes Cuvier, 1805
- Trinchesiidae F. Nordsieck, 1972
- Catriona Winckworth, 1941
- Diaphoreolis Iredale & O’Donoghue, 1923
- Phestilla Bergh, 1874
- Rubramoena Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
- Selva Edmunds, 1964
- Tenellia A. Costa, 1866
- Trinchesia Ihering, 1879
- Xenocratenidae Martynov, Lundin, Picton, Fletcher, Malmberg & Korshunova, 2020
- Xenocratena Odhner, 1940
The Fionoidea of the Mediterranean and around the Iberian Peninsula are:
Amphorina andra
Amphorina farrani
Amphorina linensis
Amphorina pallida
Calma glaucoides
Calma gobioophaga
Catriona aurantia
Catriona maua
Coryphella verrucosa
Cumanotus beaumonti
Cuthona correai
Cuthona nana
Cuthona perca
Cuthona thompsoni
Cuthona willani
Eubranchus amazighi
Eubranchus capellinii
Eubranchus cingulatus
Eubranchus doriae
Eubranchus exiguus
Eubranchus prietoi
Eubranchus tricolor
Eubranchus vittatus
Fiona pinnata
Fjordia chriskaugei
Fjordia insolita
Fjordia lineata
Luisella babai
Microchlamylla gracilis
Rubramoena amoena
Rubramoena rubescens
Tenellia adspersa
Tergipes tergipes
Trinchesia albopunctata
Trinchesia caerulea
Trinchesia cuanensis
Trinchesia foliata
Trinchesia genovae
Trinchesia granosa
Trinchesia ilonae
Trinchesia miniostriata
Trinchesia morrowae
Trinchesia ocellata
Bibliography
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Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.
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Bouchet, P., Rocroi, J. P., Hausdorf, B., Kaim, A., Kano, Y., Nützel, A., Parkhaev, P. et al. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia, 61(1-2), 1-526.
