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Garden Snail
Cornu aspersum
32,514 observations
Opalescent Nudibranch
Hermissenda opalescens
20,717 observations
Button's Banana Slug
Ariolimax buttoni
16,724 observations
California Mussel
Mytilus californianus
14,252 observations
Spotted Dorid
Triopha maculata
11,652 observations
Milk Snail
Otala lactea
11,115 observations
Hopkins' Rose Nudibranch
Ceratodoris rosacea
10,370 observations
Pacific Banana Slug
Ariolimax columbianus
10,032 observations
San Diego Dorid
Diaulula sandiegensis
9,182 observations
California Seahare
Aplysia californica
8,920 observations
Black Tegula
Tegula funebralis
8,872 observations
Monterey Dorid
Doris montereyensis
7,797 observations
Wavy Turban
Megastraea undosa
7,237 observations
Slender Banana Slug
Ariolimax dolichophallus
6,846 observations
Mossy Chiton
Mopalia muscosa
6,288 observations
Gumboot Chiton
Cryptochiton stelleri
6,281 observations
Hilton's Aeolid
Phidiana hiltoni
5,434 observations
California Spiny Chiton
Nuttallina californica
5,393 observations
Noble Dorid
Peltodoris nobilis
5,250 observations
Owl Limpet
Lottia gigantea
5,233 observations
California Aglaja
Navanax inermis
5,068 observations
California Banana Slug
Ariolimax californicus
4,769 observations
Clown Dorid
Triopha catalinae
4,736 observations
Red Sponge Dorid
Rostanga pulchra
4,676 observations
Giant Keyhole Limpet
Megathura crenulata
4,657 observations
White-speckled Dorid
Doriopsilla fulva
4,611 observations
Spanish Shawl
Flabellinopsis iodinea
4,460 observations
White-spotted Sea Goddess
Doriopsilla albopunctata
4,395 observations
Salt-and-pepper Doris
Aegires albopunctatus
4,342 observations
Sorcerer's Dorid
Polycera atra
4,008 observations
Giant Rock Scallop
Crassadoma gigantea
3,959 observations
Branched Dendronotid
Dendronotus venustus
3,780 observations
Decollate Snail
Rumina decollata
3,774 observations
Fisher's Aeolid
Orienthella piunca
3,727 observations
Black Seahare
Aplysia vaccaria
3,554 observations
Norris's Topsnail
Norrisia norrisii
3,435 observations
Gould Beanclam
Donax gouldii
3,426 observations
Red Abalone
Haliotis rufescens
3,267 observations
Yellow Cellar Slug
Limacus flavus
3,246 observations
Colorful Dirona
Dirona picta
3,117 observations
Milky Slug
Deroceras reticulatum
3,107 observations
Pismo Clam
Tivela stultorum
3,018 observations
Purple Olive Snail
Callianax biplicata
2,981 observations
McDonald's Dorid
Limacia mcdonaldi
2,935 observations
Rough Limpet
Lottia scabra
2,714 observations
California Cone
Californiconus californicus
2,692 observations
Kellet's Whelk
Kelletia kelletii
2,669 observations
Lesser Two-spot Octopus
Octopus bimaculoides
2,637 observations
Stubby Dendronotid
Dendronotus subramosus
2,632 observations
Volcano Keyhole Limpet
Fissurella volcano
2,594 observations
Frequently Asked Questions
- The 10 most common molluscs in California are:
- Garden Snail (Cornu aspersum)
- Opalescent Nudibranch (Hermissenda opalescens)
- Button's Banana Slug (Ariolimax buttoni)
- California Mussel (Mytilus californianus)
- Spotted Dorid (Triopha maculata)
- Milk Snail (Otala lactea)
- Hopkins' Rose Nudibranch (Ceratodoris rosacea)
- Pacific Banana Slug (Ariolimax columbianus)
- San Diego Dorid (Diaulula sandiegensis)
- California Seahare (Aplysia californica)
- The most observed mollusc in California is Garden Snail (Cornu aspersum), with 32,514 recorded observations.
- Some of the most commonly observed native molluscs in California include:
- Spotted Dorid (Triopha maculata)
- Hopkins' Rose Nudibranch (Ceratodoris rosacea)
- California Seahare (Aplysia californica)
- Wavy Turban (Megastraea undosa)
- Hilton's Aeolid (Phidiana hiltoni)