Barnacle Nudibranch
Onchidoris bilamellata (Linnaeus, 1767)
Description 2
Dorsum brownish-white, with irregular blotches of light rusty brown to dark chocolate brown, occasionally in the form of 2 or 3 irregular longitudinal stripes. Rhinophores with 14-20 lamellae and encrusted with brown except at translucent grayish-white tip. Branchial plumes 16-32 or more, unipinnate, arranged in 2 semi-circles just anterior of the anus, usually encrusted with brown. Labial tentacles in form of oral veil. Similar to the much rarer Acanthodoris brunnea, which has longer rhinophores; higher, tubercles on dorsum, and branchial plumes arranged in a circle around the anus.
Size 2
Typically about 20mm in length.
Geographic Range 2
Alaska, to Baja California, Mexico; Britain; Europe; east coast of USA; Greenland; Circumboreal.
Notes 2
Often found with the acorn barnacles upon which it feeds.
References 2
BARNES, H., & H. T. POWELL. 1954. Onchidoris fusca (Müller); a predator of barnacles. Journal of Animal Ecology 23(2):361-363, pl. 2.
FAHEY, S. J., & A. VALDÉS. 2005. Review of Acanthodoris Gray, 1850 with a phylogenetic analysis of Onchidorididae Alder and Hancock, 1845 (Mollusca, Nudibranchia). Proceedings of the California Academy of Sciences, series 4, 56(20):213-272. PDF
POTTS, G. W. 1970. The ecology of Onchidoris fusca (Nudibranchia). Journal of the Marine Biological Association of the United Kingdom 50(2):269-292, pls. I-II.
SOUTHERN CALIFORNIA ASSOCIATION OF MARINE INVERTEBRATE TAXONOMISTS. 2018. A taxonomic listing of benthic macro- and megainvertebrates from infaunal & epibenthic monitoring and research programs in the southern California bight, edition 12, 1 July 2018, xviii + 167 pp. PDF
VALDÉS, Á, F. J. MURILLO, J. B. MCCARTHY, & N. YEDINAK. 2016. New deep-water records and species of North Atlantic nudibranchs (Mollusca, Gastropoda: Heterobranchia) with the description of a new species. Journal of the Marine Biological Association of the United Kingdom Kingdom 97(2):303-319. PDF
Synonyms 2
Lamellidoris bilamellata, Lamellidoris fusca (Müller, 1776) , Onchidoris fusca (Müller, 1776) .
Additional Info 2
Sources and Credits
- (c) Gary McDonald, all rights reserved, uploaded by Gary McDonald
- (c) Gary McDonald, some rights reserved (CC BY-SA)
More Info
iNat Map
| Body | doridiform |
|---|---|
| Classification | Doridina |
| Dorsum | tuberculate |
| Labial tentacles | oral veil |
| Rhinophores | perfoliate |
