Onchidoris bilamellata
(Linnaeus, 1767)

Suborder: DORIDINA
Family: Onchidorididae


North Atlantic - Britain and France north along Norwegiian coast to White Sea, Spitzbergen, west to Iceland, Greenland and down North American coast to Connecticut. Also North Pacific with records from Bering Sea, Alaska, Pujet Sound south to California.


off Mount Desert Island, New England, USA [Atlantic coast]., 2-3 cm long. Photo: Paul Young

Reaches 40mm in length and found from intertidal to 20m. Often very abundant locally, feeding on barnacles (Elminius, Balanus).

•Bleakney, J.S. (1996) Sea Slugs of Atlantic Canada and the Gulf of Maine,
• Bleakney, J.S. & Saunders, C.L. (1978) Life history observations on the nudibranch mollusc Onchidoris bilamellata in the intertidal zone of Nova Scotia. Beaufortia, Zoological Museum Univ., Amsterdam, 92: 82-85.
• Crampton, D.M. (1977) Functional anatomy of the buccal apparatus of Onchidoris bilamellata (Mollusca: Opisthobranchia). Transactions of the Zoological Society of London, 34: 45-86.
• Pelseneer, P. (1922) Sur une habitude de Doris bilamellata. Annls. Soc. roy. zool. Belg., 53: 28-32
• Potts, G.W. (1981) The anatomy of respiratory structures in the dorid nudibranchs, Onchidoris bilamellata and Archidoris pseudoargus, with details of the epidermal glands. Journal of the Marine Biological Association, United Kingdom, 61: 959-982.
• Thompson, T.E. (1984) Migrations of Onchidoris bilamellata during tidal emersion: a refutation. J. Moll. Stud., 50(2): 123.
• Thompson, T.E. & Brown, G.H. (1984) Biology of Opisthobranch Molluscs, Vol 2. Ray Society: London.
• Todd, C.D. (1979) The population ecology of Onchidoris bilamellata (L). (Gastropoda: Nudibranchia). J. Exp. Mar. Biol. Ecol. 41(3): 213-255.

Authorship details
Rudman, W.B., 2001 (June 18) Onchidoris bilamellata (Linnaeus, 1767). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/onchbila

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