(Oregon to Southeast Alaska)Click on the name of the Order to view the species within that category.
A representative sampling of species for each family are shown
to give an example of the characteristics exhibited by that group.
Hermaeidae Sapsucker Haminoeidae
Aglajidae Aglaja Limapontiidae Hansine's Egg Eater / Sapsucker Pleurobranchidae California Sidegill Aplysiidae Zebra Leafslug Clionidae
Cymbuliidae Sea Butterfly
A few of these first families have shells, but they are actually opisthobranchs. They are often grouped near the shelled gastropods in books. We've placed them in both locations to aid in identification.
Corambidae Corambids Many
southern species of nudibranchs may be spotted in the Pacific Northwest
during El Niņo Events. See our page covering El Niņo Event Range Shifts. Tethyidae Lion's Melibe Arminiidae Striped Nudibranch Aegiretidae Aegires Goniodorididae Ancula Okenia Calycidorididae Diaphorodoris Nudibranch Egg Masses Samples of some nudibranch egg masses
(click on photo to enlarge)
Actinocyclidae Dorid Gastropteridae Stomach Wing
This species is not a nudibranch. It is another type ofOnchidiidae
gastropod. Since it is without a shell, and the only one
of its kind we show, we include it here.
Deception Pass State Park, WA
Petersburg, AKOnchidella borealis Dall, 1871Leather Limpet
intertidal central California to northern Alaska
Can be found with a bit of hunting. The species is small and blends into its
environment. Despite its name, it is not closely related to limpets. It is air breathing
and lives in the high intertidal zone. (click on photos to enlarge)
Tritoniidae Orange-Peel Nudibranch and Tritonias Dorididae Dorids and Sea Lemons
This page last revised: 7-3-2017
Aeolidiidae Aeolids Dotidae Doto Proctonotidae Janolus
material posted on this site
may be used for educational or
non-commercial use provided this web site is duly credited as being the
source of the material. Copyright of all images remains with the
originator. For the use of photos, please request permission
through one of the contact listings.
Citation: Pacific Northwest Shell Club, www.PNWSC.org
Diaphanidae Diaphana Cylichnidae Barrel-bubble Shells
Facelinidae Opalescent Nudibranch