Look Alikes
provided by Invertebrates of the Salish Sea
How to Distinguish from Similar Species: Acanthodoris hudsoni has yellow on the tips of the rhinophores and gills, has a yellow band around its margin, and usually has 5 gills.
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Comprehensive Description
provided by Invertebrates of the Salish Sea
Biology/Natural History: This species is said to feed on compound ascidians and on bryozoans such as Alcyonidium spp. It lays its egs in whorled ribbons of capsules which stand on edge on the rocks they are laid on. The eggs are white to cream colored. Kozloff's key states that there is no yellow band around the margin of this distinctive species. This individual seems to have at least a partial yellow band around the margin so it may be another color phase of this variable species or it could possibly be a hybrid with a related species such as A. hudsoni, which does have such a band.
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Distribution
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Geographical Range: Baranof Island, Alaska to Santa Barbara, CA; less common in southern portion of range.
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Habitat
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Depth Range: Low intertidal to 10 m
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Comprehensive Description
provided by Invertebrates of the Salish Sea
This dorid nudibranch has a whitish or off-white color. Its dorsum is covered with yellow-tipped papillae. Its rhinophores and gills are tipped with brown, rust, or maroon color. It has white specks on the rhinophore stalks, which are most visible on darker individuals. Length to 3 cm.
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Acanthodoris nanaimoensis
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Acanthodoris nanaimoensis
Acanthodoris nanaimoensis, the Nanaimo horned dorid, is a species of dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.[3]
Distribution
A. nanaimeonsis was described in Jesse Island, in the lagoon near Hammond's Bay, Nanaimo, and British Columbia. Frank Mace MacFarland, an American malacologist, described the same species in Moss Beach, Montara Point, San Mateo County, in California, under the name Acanthodoris columbina.[4] It is reported from Halibut Point, Baranof Island, Alaska south to Purisima Point, Santa Barbara, California.[5][6][7] Some specimens from Pillar Point, San Mateo County, California, Puget Sound, Kitsap County, and Washington, have been sequenced for 16S ribosomal RNA, Histone H3 and CO1 genes.[8][9]
References
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^ O'Donoghue, Charles Henry. (1921) Nudibranchiate Mollusca from the Vancouver Island region. Transactions of the Royal Canadian Institute 13(1):147-209, pls. 7-11 [1-5].
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^ Fahey S. & Valdés A. (2005). A review of Acanthodoris Gray, 1850 with a Phylogenetic Analysis of Onchidorididae Alder and Hancock, 1845 (Mollusca, Nudibranchia). Archived July 21, 2011, at the Wayback Machine Proceedings of the California Academy of Sciences 56: 213-272.
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^ Bouchet, P. (2015). Acanthodoris nanaimoensis O’Donoghue, 1921. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-01-11.
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^ Macfarland, F. M. (1926) The Acanthodorididae of the California coast. Nautilus 39(3):94-103, page 94.
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^ Lee, R. S., & Nora R. Foster. (1985) A distributional list with range extensions of the opisthobranch gastropods of Alaska. Veliger 27(4):440-448.
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^ Behrens, D. W., & Hermosillo, A. (2005) Eastern Pacific nudibranchs, a guide to the opisthobranchs from Alaska to Central America. vi + 137 pp., 314 photos. Sea Challengers, Monterey, California, page 56.
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^ Rudman, W.B., 2005 (November 10) Acanthodoris nanaimoensis O'Donoghue, 1921. [In] Sea Slug Forum. Australian Museum, Sydney.
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^ Hallas, JM and Gosliner, TM. (2015) Family Matters: the first molecular phylogeny of the Onchidorididae (Mollusca, Gastropoda, Nudibranchia). Molecular Phylogenetics and Evolution, 88: 16-27.
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^ Hallas, J.M., Simison, W.B. & Gosliner, T.M. (2016) Dating and biogeographical patterns in the sea slug genus Acanthodoris Gray, 1850 (Mollusca, Gastropoda, Nudibranchia). Molecular Phylogenetics and Evolution, 97: 19-31.
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Acanthodoris nanaimoensis: Brief Summary
provided by wikipedia EN
Acanthodoris nanaimoensis
Acanthodoris nanaimoensis, the Nanaimo horned dorid, is a species of dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.
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Acanthodoris nanaimoensis 
