Fionidae is a family of sea slugs, aeolid nudibranchs, marine gastropod molluscs in the superfamily Fionoidea.

General characteristics

The animal bears four simple tentacles and numerous papillose branchiae. The vent is situated latero-dorsally. The mouth is equipped with jaws, and the lingual membrane bears a single series of plates.

Taxonomic history

This family was expanded to include Tergipedidae, Eubranchidae and Calmidae as a result of a molecular phylogenetics study. This was reversed in 2017 with further DNA evidence and a re-interpretation of genus and family characteristics.

Genera

According to Korshunova et al. (2025), genera within the family Fionidae include:

• Fiona Alder & Hancock [in Forbes & Hanley], 1853

• Tergiposacca Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016

Other genera not mentioned in Korshunova et al. (2025) include:

• Zatteria Eliot, 1902

References

External links