Onchidoris

Onchidoris is a genus of dorid nudibranchs in the family Onchidorididae. One of its members is known to prey on barnacles and the others eat bryozoans. The radula contains a rachidian tooth when fully developed, but this is vestigial in some species.

Species
Species within the genus Onchidoris include:
 * Onchidoris aureopuncta (A. E. Verrill, 1901)
 * Onchidoris bilamellata (Linnaeus, 1767) - type species
 * Onchidoris derjugini (Volodchenko, 1941)
 * Onchidoris diademata (Gould, 1870)
 * Onchidoris grisea (Gould, 1870)
 * Onchidoris hystricina (Bergh, 1878)
 * Onchidoris lactea (A. E. Verrill, 1900)
 * Onchidoris loveni (Alder & Hancock, 1862)
 * Onchidoris macropompa Martynov, Korshunova, Sanamyan & Sanamyan, 2009
 * Onchidoris maugeansis (Burn, 1958)
 * Onchidoris miniata (A. E. Verrill, 1901)
 * Onchidoris muricata (Müller O.F., 1776)
 * Onchidoris olgae (Martynov, Korshunova, Sanamyan & Sanamyan, 2009)
 * Onchidoris olivacea (A. E. Verrill, 1900)
 * Onchidoris perlucea Ortea & Moro, 2014
 * Onchidoris proxima (Alder & Hancock, 1854)
 * Onchidoris quadrimaculata (A. E. Verrill, 1900)
 * Onchidoris slavi (Martynov, Korshunova, Sanamyan & Sanamyan, 2009)
 * Onchidoris sparsa (Alder & Hancock, 1846)
 * Onchidoris tenella (Gould, 1870)
 * Onchidoris tschuktschica (Krause, 1885)
 * Species brought into synonymy :
 * Onchidoris albonigra (Pruvot-Fol, 1951) : synonym of Knoutsodonta albonigra (Pruvot-Fol, 1951)
 * Onchidoris aspera (Alder & Hancock, 1842) : synonym of Onchidoris muricata (O. F. Müller, 1776)
 * Onchidoris bouvieri (Vayssière, 1919) : synonym of Knoutsodonta bouvieri (Vayssière, 1919)
 * Onchidoris brasiliensis Alvim, Padula & Pimenta, 2011 : synonym of Knoutsodonta brasiliensis (Alvim, Padula & Pimenta, 2011)
 * Onchidoris cervinoi Ortea & Urgorri, 1979 : synonym of Knoutsodonta cervinoi Ortea & Urgorri, 1979
 * Onchidoris depressa (Alder & Hancock, 1842) : synonym of Knoutsodonta depressa (Alder & Hancock, 1842)
 * Onchidoris fusca (Müller O.F., 1776) : synonym of Onchidoris bilamellata (Linnaeus, 1767)
 * Onchidoris inconspicua (Alder & Hancock, 1851) : synonym of Knoutsodonta inconspicua (Alder & Hancock, 1851)
 * Onchidoris leachii Blainville, 1816 accepted as Onchidoris bilamellata (Linnaeus, 1767)
 * Onchidoris luteocincta (M. Sars, 1870) : synonym of Diaphorodoris luteocincta (M. Sars, 1870)
 * Onchidoris maugeansis (Burn, 1958) : synonym of Knoutsodonta maugeansis (Burn, 1958)
 * Onchidoris neapolitana (delle Chiaje, 1841) : synonym of Knoutsodonta neapolitana (delle Chiaje, 1841)
 * Onchidoris oblonga (Alder & Hancock, 1845) : synonym of Knoutsodonta oblonga (Alder & Hancock, 1845)
 * Onchidoris pusilla (Alder & Hancock, 1845) : synonym of Knoutsodonta pusilla (Alder & Hancock, 1845)
 * Onchidoris reticulata Ortea, 1979 : synonym of Knoutsodonta reticulata Ortea, 1979
 * Onchidoris sparsa (Alder & Hancock, 1846) : synonym of Knoutsodonta sparsa (Alder & Hancock, 1846)
 * Onchidoris tridactila Ortea & Ballesteros, 1982 : synonym of Knoutsodonta tridactila Ortea & Ballesteros, 1982
 * Onchidoris tuberculatus Hutton, 1873 : synonym of Archidoris wellingtonensis (Abraham, 1877) : synonym of Doris wellingtonensis Abraham, 1877

Taxonomy
Many authors prefer Onchidorus Blainville, 1816 as the valid name for the genus, changed to Onchidoris (Winckworth, 1932; Bouchet & Tardy, 1976; Thompson & Brown, 1976; Cattaneo & Barletta, 1984). According to Pruvot-Fol (1954) however this latter is a nomen nudum, while the elder synonym Villiersia is a nomen oblitum (see also Abbott, 1974). This is why Odhner (1907), Pruvot-Fol (1954), Swennen (1961) and Abbott (1974) are followed in the use of Lamellidoris Alder & Hancock, 1855.