Velutinidae is a family of small sea snails, marine gastropod molluscs in the clade Littorinimorpha.
The shell of these animals is very thin and delicate, and internal, completely covered by the mantle (which has fused lobes) so the appearance of these animals more closely resembles that of sea slugs rather than sea snails.
The following two subfamilies were recognized in the taxonomy of Bouchet & Rocroi (2005):
Subfamily Velutininae J. E. Gray, 1840 - synonyms: Marseniidae Leach in Gray, 1847; Marsenininae Odhner, 1913; Capulacmaeinae Golikov & Gulbin, 1990; Onchidiopsinae Golikov & Gulbin, 1990 (n.a.); Marseniopsidae Badel, 1993 (n.a.)Subfamily Lamellariinae A. D. d'Orbigny, 1841 - synonyms: Coriocellidae Troschel, 1848; Sacculidae Thiele, 1929 (inv.); Pseudosacculidae Kuroda, 1933Genera within the family Velutinidae include:
CalyptoconchaCalyptoconcha pellucida A. E. Verrill, 1880 - translucent lamellariaCartilagovelutina Golikov & Gulbin, 1990Cartilagovelutina beringensis (Derjugin, 1950)Cartilagovelutina chondrina (Bartsch in Derjugin, 1950)Cartilagovelutina cristata (Derjugin, 1950)Ciliatovelutina Golikov & Gulbin, 1990Cilifera Golikov & Gulbin, 1990Coriocella Blainville, 1824Echinospira Krohn, 1853Lamellaria G. Montagu, 1815Lamellariopsis Vayssière, 1906Limneria H. Adams & A. Adams, 1851Marseniella Bergh, 1886Marseniella borealis Bergh, 1886Marsenina Gray, 1850Marseniopsis Bergh, 1886Mysticoncha Allan, 1936Onchidiopsis Bergh, 1853Onchidiopsis glacialis M. Sars, 1851 - icy lamellariaOnchidiopsis latissima Odhner, 1913Onchidiopsis spitzbergensis Jensen, in Thorson, 1944Piliscus Lovén, 1859Piliscus commodus Middendorff, 1851Piliscus rostratus (Golikov & Gulbin, 1990)Piliscus undulatus (Golikov & Gulbin, 1990)Pseudosacculus Hirase, 1928Pseudotorellia Warén, 1989Pseudotorellia fragilis Warén, 1989Torellivelutina McLean, 2000Velutina J. Fleming, 1820Velutina plicatilis (O. F. Müller, 1776)Velutina schneideri Friele, 1886Velutina velutina (O. F. Müller, 1776)Subfamily Lamellariinae A. D. d'Orbigny, 1841
Subfamily Velutininae Gray, 1840
Genera brought into synonymyCapulacmaea M. Sars, 1859 : synonym of Piliscus Lovén, 1859Chelinotus Swainson, 1840: synonym of Coriocella Blainville, 1824Cryptocella H. Adams & A. Adams, 1853: synonym of Lamellaria Montagu, 1815Marsenia Oken, 1823: synonym of Lamellaria Montagu, 1815Marvillia [sic]: synonym of Limneria H. Adams & A. Adams, 1851Morvillia Gray, 1857: synonym of Limneria H. Adams & A. Adams, 1851Oithonella Mörch, 1857: synonym of Marsenina Gray, 1850Oncidiopsis [sic]: synonym of Onchidiopsis Bergh, 1853Pilidium Middendorff, 1851: synonym of Piliscus Lovén, 1859Pseudoacculus [sic]: synonym of Pseudosacculus Hirase, 1928Sacculus Hirase, 1927: synonym of Pseudosacculus Hirase, 1928Velutella Gray, 1847: synonym of Velutina Fleming, 1820
