Velutinidae
Introduction '''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.
Taxonomy Drawing of dorsal view of live animal of ''Onchidiopsis glacialis''''Coriocella nigra''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, 1933Drawing of dorsal view of live animal of ''Lamellaria latens''Drawing of ventral view of live animal of ''Lamellaria latens''
Genera Genera within the family Velutinidae include:* ''Calyptoconcha''** ''Calyptoconcha pellucida'' A. E. Verrill, 1880 - translucent lamellaria* ''Cartilagovelutina'' Golikov & Gulbin, 1990** ''Cartilagovelutina beringensis'' (Derjugin, 1950)** ''Cartilagovelutina chondrina'' (Bartsch in Derjugin, 1950)** ''Cartilagovelutina cristata'' (Derjugin, 1950)* ''Ciliatovelutina'' Golikov & Gulbin, 1990* ''Cilifera'' Golikov & Gulbin, 1990* ''Coriocella'' Blainville, 1824 * ''Echinospira'' Krohn, 1853* ''Lamellaria'' G. Montagu, 1815* ''Lamellariopsis'' Vayssière, 1906* ''Limneria'' H. Adams & A. Adams, 1851* ''Marseniella'' Bergh, 1886** ''Marseniella borealis'' Bergh, 1886* ''Marsenina''  Gray, 1850* ''Marseniopsis'' Bergh, 1886* ''Mysticoncha'' Allan, 1936* ''Onchidiopsis'' Bergh, 1853** ''Onchidiopsis glacialis'' M. Sars, 1851 - icy lamellaria** ''Onchidiopsis latissima'' Odhner, 1913** ''Onchidiopsis spitzbergensis'' Jensen, in Thorson, 1944* ''Piliscus'' Lovén, 1859** ''Piliscus commodus'' Middendorff, 1851** ''Piliscus rostratus'' (Golikov & Gulbin, 1990)** ''Piliscus undulatus'' (Golikov & Gulbin, 1990)* ''Pseudosacculus'' Hirase, 1928* ''Pseudotorellia'' Warén, 1989** ''Pseudotorellia fragilis'' Warén, 1989* ''Torellivelutina'' McLean, 2000* ''Velutina'' Fleming, 1820** ''Velutina plicatilis'' (Müller, 1776)** ''Velutina schneideri'' Friele, 1886** ''Velutina velutina'' (Müller, 1776)Subfamily Lamellariinae A. D. d'Orbigny, 1841Subfamily Velutininae  Gray, 1840;Genera brought into synonymy:* ''Capulacmaea'' M. Sars, 1859 : synonym of ''Piliscus'' Lovén, 1859* ''Chelinotus'' Swainson, 1840: synonym of ''Coriocella'' Blainville, 1824* ''Cryptocella'' H. Adams & A. Adams, 1853: synonym of ''Lamellaria'' Montagu, 1815* ''Marsenia'' Oken, 1823: synonym of ''Lamellaria'' Montagu, 1815* ''Marvillia'' sic: synonym of ''Limneria'' H. Adams & A. Adams, 1851* ''Morvillia'' Gray, 1857: synonym of ''Limneria'' H. Adams & A. Adams, 1851* ''Oithonella'' Mörch, 1857: synonym of ''Marsenina'' Gray, 1850* Oncidiopsis sic: synonym of ''Onchidiopsis'' Bergh, 1853* ''Pilidium'' Middendorff, 1851: synonym of ''Piliscus'' Lovén, 1859* ''Pseudoacculus'' sic: synonym of ''Pseudosacculus'' Hirase, 1928* ''Sacculus'' Hirase, 1927: synonym of ''Pseudosacculus'' Hirase, 1928* ''Velutella'' Gray, 1847: synonym of ''Velutina'' Fleming, 1820
References
Sources * Philippe Bouchet, Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526.
External links *  WoRMS official family page*  Sea Slug Forum info