Comprehensive Description
provided by Invertebrates of the Salish Sea
This small, distinctive dorid nudibranch is rose pink. Although it is a dorid it has long dorsal outgrowths that resemble cerata and almost hide its rhinophores and gill ring. Up to 3 cm long but usually less than 2 cm. Body is internally stiffened by calcareous spicules.
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Look Alikes
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How to Distinguish from Similar Species: No other dorid is rose pink and has cerata-like outgrowths of the dorsum. Triopha catalinae and Limacia cockerelli have orange projections but have a white dorsum.
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Comprehensive Description
provided by Invertebrates of the Salish Sea
Biology/Natural History: Feeds on the bryozoan Eurystomella bilabiata, which is also a rosy color. Lays eggs in a narrow rose-colored ribbon spiraled counterclockwise. The nudibranch Navanax inermis eats this species. There are no digestive diverticula in the cerata-like growths. Named after Timothy Hopkins, a railroad executive who helped establish Hopkins Marine Station.
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Habitat
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_Rocky intertidal, especially in lower midlittoral tidepools, mostly on open coast.
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Distribution
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Geographical Range: Coos Bay, OR to Puerto Santo Tomas, Baja California. Especially common near Monterey Bay
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Habitat
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Depth Range: Low intertidal to 6 m
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Okenia rosacea
provided by wikipedia EN
Okenia rosacea, commonly known as Hopkin's rose nudibranch, is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.[3]
Three
Okenia rosacea (Hopkin's rose nudibranch) and egg spiral on bryozoan
Distribution
This species was described from Monterey Bay, California. It can be found along the coast of western North America from Oregon to Baja California.[4]
Description
These pink sea slugs are characterized by numerous long papillae on their back, tapering into a round tip. These papillae are sometimes more or less white at their tips. This pink color is produced by the xanthophyllic pigment hopkinsiaxanthin, most likely obtained through feeding on the cheilostomatous bryozoan, Integripelta bilabiata.[5]
The mantle, foot and the head are merged into one entity with a flattened profile. The oral tentacles are lacking. The 20 gills are situated around the anal papillae and are somewhat shorter.
The shape of the taenioglossan radula is unique in this family, as the middle tooth is large and elongate, ending in a hook-like tip. The lateral teeth are small and are actually reduced to a rudimentary plate.
References
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^ MacFarland, F. M. 1905. A preliminary account of the Dorididae of Monterey Bay, California. Proceedings of the Biological Society, Washington 18:35-54.
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^ Gosliner T. M. (2004). "Phylogenetic Systematics of Okenia, Sakishmaia, Hopkinsiella and Hopkinsia (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific". Proceedings of the California Academy of Sciences 55(5): 125-161. PDF.
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^ a b Rosenberg, G. (2012). Okenia rosacea. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=599485 on 2012-06-06
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^ Rudman, W.B., 2004 (December 21) Okenia rosacea (Macfarland, 1905). [In] Sea Slug Forum. Australian Museum, Sydney.
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^ McBeth J. W. (1971). "Studies on the food of nudibranchs". The Veliger 14: 158-161.
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Okenia rosacea: Brief Summary
provided by wikipedia EN
Okenia rosacea, commonly known as Hopkin's rose nudibranch, is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.
Three Okenia rosacea (Hopkin's rose nudibranch) and egg spiral on bryozoan
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_and_egg_spiral_on_bryozoan.jpg)
Three Okenia rosacea (Hopkin's rose nudibranch) and egg spiral on bryozoan
