Nudibranchs (Opisthobranchs)

(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
Hermaea oliviae
Sapsucker
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Haminoeidae
Haminoea japonica
Bubble Shells
Aglajidae
Aglaja ocelligera Melanochlamys diomedea
Aglaja

Acteonidae
Rictaxis punctocaelatus
Barrel Shell
Order Cephalaspidea








Limapontiidae
Olea hansineensis Placida dendritica
Hansine's Egg Eater / Sapsucker

Onchidorididae
 Acanthodoris nanaimoensis Acanthodoris pilosa Adalaria proxima Diaphorodoris lirulatocauda Loy thompsoni Onchidoris bilamellata
Onchidorids

Pleurobranchidae
Berthella californica
California Sidegill

Order Thecosomata
Aplysiidae
Phyllaplysia taylori
Zebra Leafslug


Order Gymnosomata

Order Anaspidea

Clionidae
Clione limacina
Sea Angel


Cymbuliidae
Corolla spectabilis
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.  




Order Nudibranchia - Infraorder Doridacea



Plakobranchidae
Elysia hedgpethi
Sapsucker
Order Sacoglossa


Order Pleurobranchomorpha


 Discodorididae
Diaulula sandiegensis Geitodoris heathi Montereina lentiginosa Rostanga pulchra
Dorids and Sea Lemons

Polyceridae
Limacia cockerelli Palio dubia Polycera tricolor Triopha catalinae Multi-colored Dorids
 





Order Nudibranchia - Infraorder Dendronotida










Tethyidae
Melibe leonina 
Lion's Melibe
 
Arminiidae
Armina californica
 Striped Nudibranch

Order Nudibranchia - Infraorder Aeolidioidea
Dironidae
Dirona albolineata Dirona pellucida 
Dirona  

Aegiretidae
Aegires albopunctatus
Aegires
Goniodorididae
Ancula gibbosa Okenia vancouverensis
Ancula            Okenia










Cadlinidae
Aldisa cooperi
Cadlina luteomarginata Calina modesta
Aldisa & Cadlina









Nudibranch Egg Masses
nudibranch eggs nudibranch eggs nudibranch eggs
Samples of some nudibranch egg masses
(click on photo to enlarge)

Actinocyclidae
Hallaxa chani
Dorid

Gastropteridae
Gastropteron pacificum
Stomach Wing
This species is not a nudibranch.  It is another type of
gastropod.  Since it is without a shell, and the only one
of its kind we show, we include it here.
Onchidiidae
Onchidella borealis Onchidella borealis
Onchidella borealis Dall, 1871
Leather 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)
Flabellinidae
Cumanotus fernaldi Flabellina trilineata Flabellina verrucosa Flabellina trophina
Aeolids




Tritoniidae
Tochuina tetraquetra Tritonia diomedea Tritonia festiva
Orange-Peel Nudibranch and Tritonias


Dorididae
Doris montereyensis Doris odhneri
Dorids and Sea Lemons




This page last revised: 5-24-2014

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Aeolidiidae
Aeolidia papillosa Cerberilla mosslandica
Aeolids

Dendronotidae
Dendronotus albus Dendronotus albus Dendronotus iris Dendronotus rufus
Dendronotus







Dotoidae
Doto cf amyra
Doto
Order Nudibranchia - Infraorder Euarminida

















Order Nudibranchia - Infraorder [unassigned] Dexiarchia





Tergipedidae
Catriona columbiana Cuthona concinna
Aeolids








Proctonotidae
Janolus fuscus
Janolus
Reference list for Nudibranch pages




























Terms of Use
All 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 californica
Diaphana









Cylichnidae
Acteocina culcitella   
Barrel-bubble Shells

Facelinidae
Hermissenda crassicornis
Opalescent Nudibranch