Fionidae

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

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
Genera within the family Fionidae include:
 * Fiona Alder & Hancock [in Forbes & Hanley], 1853
 * Calma Alder & Hancock, 1855
 * Cuthona Alder & Hancock, 1855
 * Cuthonella Bergh, 1884
 * Eubranchus Forbes, 1838
 * Murmania Martynov, 2006
 * Tenellia A. Costa, 1866
 * Tergipes Cuvier, 1805
 * Tergiposacca Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
 * Rubramoena Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016
 * Abronica Cella, Carmona, Ekimova, Chichvarkhin, Schepetov & Gosliner, 2016