If you haven’t spent time gazing down into a tidepool, patiently scanning it for nudibranchs, you’ve been missing out. Below are examples of nudibranchs you are likely to run across on Oregon’s exposed rocky shores, if you spend some time trying. The photos on this page are from northern Oregon unless, otherwise noted in the caption. My organization follows Lamb and Hanby (2005). Common names are my choice. I refer toWoRMS for scientific names, and I learn a ton by browsing the natural history riches in Kozloff (1993). Biodiversity of the Central Coast’s Molluscs page is full of great information about pretty much all the nudibranchs shown below, and then some. These nudibranchs are also covered in the books, field guides, and identification resources listed at the bottom of the page.

Doris montereyensis


Diaulula odonoghuei, spotted leopard dorid

Dave Cowles’ page on Diaulula odonoghuei has a bunch of good information on leopard dorids.


 Rostanga pulchra, red sponge nudibranch


Hermissenda crassicornis


Gotshall, D. W. 2005. Guide to Marine Invertebrates, Alaska to Baja California 2nd Edition (Revised). Shoreline Press.

Harbo, R. M. 2011. Whelks to Whales: Coastal Marine Life of the Pacific Northwest. 2nd ed. Harbour Publishing Co.

Kozloff, E. N. 1993. Seashore Life of the Northern Pacific Coast. 3rd ed. University of Washington Press.

Lamb, A. and B. P. Hanby. 2005. Marine Life of the Pacific Northwest. Harbour Publishing.

Sept. J. D. 2009. The Beachcomber’s Guide to Seashore Life in the Pacific Northwest. Revised ed. Harbour Publishing.

Online Resources

Biodiversity of the Central Coast’s molluscs page is full of great information on Pacific Northwest nudibranchs.

Pacific Northwest Shell Club’s Nudibranch page

I consulted several iNaturalist pages while preparing this page, including:

Monterey Doris (Doris montereyensis)

California Sea Slugs – Nudibranchs

Spotted Leopard Dorid (Diaulula odonoghuei)

Thick-horned Nudibranch (Hermissenda crassicornis)

This page was updated on July 29, 2020