Flabellina is a genus of sea slugs, specifically aeolid nudibranchs. These animals are marine gastropod molluscs in the family Flabellinidae. Taxonomic history The genus Flabellina was established by John Edward Gray in 1833 with the type species Flabellina affinis and characterised by the cerata being arranged on peduncles and the rhinophores being annulate. Many species were added by subsequent authors. In 1981 the genus Coryphella was merged under the older name Flabellina as despite a large range of morphological characters in the 64 species of Flabellinidae and Coryphellidae known at that time, no clear distinction could be found to separate the species into the two genera. In 2017 an integrative study of the 71 species then considered to be included in Flabellina redistributed the species into seven families and 26 genera. Species Species currently included in this genus are: Flabellina affinis (Gmelin, 1791) Flabellina alternata Ortea & Espinosa, 1998 Flabellina bertschi Gosliner & Kuzirian, 1990 Flabellina bulbosa Ortea & Espinosa, 1998 Flabellina dana Millen & Hamann, 2006 Flabellina dushia (Marcus Ev. & Er., 1963) Flabellina engeli Ev. Marcus & Er. Marcus, 1968 Flabellina engeli lucianae Dacosta, Cunha, Simone & Schrödl, 2007 Flabellina evelinae Edmunds, 1989 Flabellina ilidioi Calado, Ortea & Caballer, 2005 Flabellina llerae Ortea, 1989 Synonymized species Flabellina albomaculata Pola, Carmona, Calado & Cervera, 2014 synonym of Edmundsella albomaculata (Pola, Carmona, Calado & Cervera, 2014) Flabellina albomarginata (Miller, 1971) synonym of Coryphellina albomarginata (M. C. Miller, 1971) Flabellina alisonae Gosliner, 1980: synonym of Flabellina bicolor Flabellina arveloi Ortea & Espinosa, 1998 synonym of Coryphellina arveloi (Ortea & Espinosa, 1998) Flabellina athadona (Bergh, 1875) synonym of Occidenthella athadona (Bergh, 1875) Flabellina babai Schmekel, 1972 synonym of Luisella babai (Schmekel, 1972) Flabellina baetica Garcia-Gomez, 1984 synonym of Baenopsis baetica (Garcia-Gomez, 1984) Flabellina bicolor (Kelaart, 1858) synonym of Samla bicolor (Kelaart, 1858) Flabellina bilas Gosliner & Willan, 1991 synonym of Samla bilas (Gosliner and Willan, 1991) Flabellina californica (Bergh, 1904) synonym of Coryphella californica Bergh, 1904 Flabellina cerverai Fischer, van der Velde & Roubos, 2007 synonym of Coryphellina cerverai (Fischer, van der Velde & Roubos, 2007) Flabellina confusa Gonzalez-Duarte, Cervera & Poddubetskaia, 2008 synonym of Calmella gaditana (Cervera, García-Gomez & García, 1987) Flabellina cooperi (Cockerell, 1901) synonym of Orienthella cooperi (Cockerell, 1901) Flabellina cynara (Marcus & Marcus, 1967) synonym of Kynaria cynara (Marcus and Marcus, 1967) Flabellina delicata Gosliner & Willan, 1991 synonym of Coryphellina delicata (Gosliner & Willan, 1991) Flabellina exoptata