Onchidoris is a genus of dorid nudibranchs in the family Onchidorididae.

[2][3][4][5] One of its members is known to prey on barnacles and the others eat bryozoans.

[6] The radula contains a rachidian tooth when fully developed, but this is vestigial in some species.

[6] Species within the genus Onchidoris include:[2] 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).

This is why Odhner (1907), Pruvot-Fol (1954), Swennen (1961) and Abbott (1974) are followed in the use of Lamellidoris Alder & Hancock, 1855.