Acanthodoris hudsoni MacFarland, 1905Named after the natural history artist, Captain Charles B. Hudson, this species is one of the most commonly miss-identified species in the Pacific Northwest. Like other members of the genus Acanthodoris, the dorsum is covered with tall thin papillations. Because it has a yellow stripe along the edge of the mantle it is repeated likely confused with Cadlina luteomarginata . When distinguishing the two species, remember, Cadlina has low tubercles on the dorsum, not tall papillations, seen on this Acanthodoris hudsoni. Another distinctive character of this species is its very long curved rhinophores.
The other closely related species is Acanthodoris nanaimoensis, who has shorter, red-tipped rhinophores and red-tipped branchial plumes.
Unlike most dorid nudibranchs, Acanthodoris hudsoni feeds on bryozoans, of the genus Alcyonidium sp. This species ranges from Alaska to San Diego, California, and Catalina Island.
Reference: MacFarland, Frank Mace. 1905. A preliminary account of the Dorididae of the Monterey Bay, California. Proceedings of the Biological Society of Washington, 18: 35-54
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