The White Sea species list
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Phylum Mollusca Linnaeus, 1758
Class Gastropoda Cuvier, 1795
Subclass Heterobranchia Burmeister, 1837
Infraclass Opistobranchia Milne-Edwards, 1848
Order Sacoglossa Ihering, 1876
Family Limapontiidae Gray, 1847
Placida dendritica (Alder & Hancock, 1843)
Limapontia senestra (Quatrefages, 1844)

Order Nudibranchia Cuvier, 1817
Family Cadlinidae Bergh, 1891
Cadlina laevis (Linnaeus, 1767)
Family Polyceridae Alder & Hancock, 1845
Palio dubia (M. Sars, 1829)
Family Goniodorididae H. Adams & A. Adams, 1854
Ancula gibbosa (Risso, 1818)
Family Onchidorididae Gray, 1827
Acanthodoris pilosa (Abildgaard in Müller, 1789)
Adalaria proxima (Alder & Hancock, 1854)
Onchidoris muricata (O. F. Müller, 1776)
Onchidoris bilamellata (Linnaeus, 1767)
Family Dendronotidae Allman, 1845
Dendronotus frondosus (Ascanius, 1774)
Dendronotus lacteus (W. Thompson, 1840)
Dendronotus niveus Ekimova, Korshunova, Schepetov, Neretina, Sanamyan & Martynov, 2015
Flabellinidae Bergh, 1889
Flabellina nobilis (A. E. Verrill, 1880)
Flabellina polaris (Volodchenko, 1946)
Flabellina verrucosa (M. Sars, 1829)
Family Cuthonellidae Miller, 1971
Cuthonella concinna (Alder & Hancock, 1843)
Cuthonella hiemalis (Roginskaya, 1987)
Family Eubranchidae Odhner, 1934
Eubranchus rupium (Møller, 1842)
Family Trinchesiidae F. Nordsieck, 1972
Trinchesia pustulata (Alder & Hancock, 1854)
Trinchesia viridis (Forbes, 1840)
Family Aeolididae Gray, 1827
Aeolidia papillosa (Linnaeus, 1761)