Marine Life‎ > ‎California‎ > ‎Invertebrates‎ > ‎

Sea Slugs

Nudibranchs are also sea slugs, but I've seen enough of them they get three whole pages.


Black Sea Hare

Aplysia vaccaria

    
(1-2: Sea Landing Cove, Santa Barbara Island / 3-4: Golf Ball Drop Off, Santa Cruz Island / 5: Howland's Landing, Santa Catalina Island)


Brown Sea Hare

Aplysia californica

       
(1-3,8: Monterey State Beach, Monterey / 4-7: San Carlos Beach, Monterey)

These large sea slugs (sometimes over a foot long) can be found on the sand in shallower water.  

They lay large spaghetti-like egg masses on kelp or eel grass:
   
(1: Monterey State Beach, Monterey / 2-4: San Carlos Beach, Monterey)


California Sidegill

Pleurobranchaea californica

   
(1-4: San Carlos Beach, Monterey)


Mushroom Sidegill

Tylodina fungina

 
(1-2: Sea Landing Cove, Santa Barbara Island)


Navanax

Navanax inermis

        
(1-2,8-9: Monterey State Beach, Monterey / 3-4: Ship Rock, Santa Catalina Island / 5: Nudibranch City, Santa Cruz Island / 6-7: Flame Reef, Santa Cruz Island)

Navanax lay lacy-looking bundles of eggs:
  
(1-2: Nudibranch City, Santa Cruz Island / 3: Flame Reef, Santa Cruz Island)


Sea Butterfly

Corolla spectabilis

       
(1-2,4: Monterey State Beach, Monterey / 3: East Pescadero Pinnacle, Pebble Beach / 5-8: San Carlos Beach, Monterey)

This looks like a jellyfish, but it's actually a free-swimming sea slug.


White Berthella

Berthella californica

       
(1,4-5,8: San Carlos Beach, Monterey / 2-3: Whaler's Cove, Point Lobos / 6: West of Santa Barbara Island / 7: Monastery Beach, Carmel-by-the-Sea)