# 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.