Fionoidea is a superfamily of small

sea slug Sea slug is a common name for some Marine biology, marine invertebrates with varying levels of resemblance to terrestrial Slug, slugs. Most creatures known as sea slugs are gastropods, i.e. they are Sea snail, sea snails (marine gastropod moll ...

s, aeolid

nudibranch Nudibranchs () are a group of soft-bodied marine gastropod molluscs, belonging to the order Nudibranchia, that shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have b ...

s. They are

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s within the suborder

Cladobranchia The Cladobranchia are a taxonomic clade of nudibranchs, sea slugs, marine gastropod molluscs in the clade Dexiarchia. Taxonomy clade Metarminida * Superfamily Metarminoidea This name is not available as a Superfamily name as it is not based on ...

. The families within Fionoidea were shown to be monophyletic on DNA evidence and a re-interpretation of family characteristics was provided.Korshunova, T.; Martynov, A.; Picton, B. (2017)
Ontogeny as an important part of integrative taxonomy in tergipedid aeolidaceans (Gastropoda: Nudibranchia) with a description of a new genus and species from the Barents Sea.
Zootaxa. 4324(1): 1.

Families

Families within the superfamily Fionoidea are as follows: * Abronicidae * Apataidae *

Calmidae Calmidae is a taxonomic family of sea slugs with only one genus and two species. These are specifically aeolid nudibranchs. They are marine gastropod mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose m ...

* Coryphellidae * Cumanotidae * Cuthonellidae * Cuthonidae *

Eubranchidae Eubranchidae is a taxonomic family of sea slugs, marine gastropod molluscs in the superfamily Aeolidioidea, the aeolid nudibranch Nudibranchs () are a group of soft-bodied marine gastropod molluscs, belonging to the order Nudibranchia, ...

* Fionidae * Magallanidae * Murmaniidae *

Paracoryphellidae Paracoryphellidae is a Taxonomy (biology), taxonomic family (biology), family of brightly coloured sea slugs, specifically nudibranchs, marine (ocean), marine gastropod mollusks. Genera and species Genera within the family Paracoryphellidae incl ...

* Pinufiidae * Pseudovermidae * Samlidae *

Tergipedidae Tergipedidae is a family of sea slugs, aeolid nudibranchs, and marine gastropod mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant ...

* Trinchesiidae * Unidentiidae * Xenocratenidae

References

{{Taxonbar, from=Q5451155 Taxa named by John Edward Gray