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Garden Snail
Cornu aspersum
31,081 observations
Opalescent Nudibranch
Hermissenda opalescens
17,895 observations
Button's Banana Slug
Ariolimax buttoni
15,496 observations
California Mussel
Mytilus californianus
13,848 observations
Spotted Dorid
Triopha maculata
10,599 observations
Milk Snail
Otala lactea
10,413 observations
Pacific Banana Slug
Ariolimax columbianus
9,288 observations
Hopkins' Rose Nudibranch
Ceratodoris rosacea
8,675 observations
California Seahare
Aplysia californica
8,558 observations
San Diego Dorid
Diaulula sandiegensis
8,317 observations
Black Tegula
Tegula funebralis
8,155 observations
Monterey Dorid
Doris montereyensis
7,292 observations
Wavy Turban
Megastraea undosa
6,964 observations
Slender Banana Slug
Ariolimax dolichophallus
6,373 observations
Mossy Chiton
Mopalia muscosa
6,039 observations
Gumboot Chiton
Cryptochiton stelleri
5,885 observations
California Spiny Chiton
Nuttallina californica
5,274 observations
Owl Limpet
Lottia gigantea
5,099 observations
Hilton's Aeolid
Phidiana hiltoni
5,056 observations
Noble Dorid
Peltodoris nobilis
4,833 observations
California Aglaja
Navanax inermis
4,765 observations
Clown Dorid
Triopha catalinae
4,436 observations
Giant Keyhole Limpet
Megathura crenulata
4,410 observations
White-speckled Dorid
Doriopsilla fulva
4,075 observations
Red Sponge Dorid
Rostanga pulchra
4,058 observations
Spanish Shawl
Flabellinopsis iodinea
3,935 observations
Giant Rock Scallop
Crassadoma gigantea
3,865 observations
White-spotted Sea Goddess
Doriopsilla albopunctata
3,703 observations
Decollate Snail
Rumina decollata
3,702 observations
Salt-and-pepper Doris
Aegires albopunctatus
3,687 observations
Black Seahare
Aplysia vaccaria
3,418 observations
Norris's Topsnail
Norrisia norrisii
3,286 observations
Gould Beanclam
Donax gouldii
3,284 observations
Sorcerer's Dorid
Polycera atra
3,198 observations
Branched Dendronotid
Dendronotus venustus
3,190 observations
Milky Slug
Deroceras reticulatum
3,021 observations
Purple Olive Snail
Callianax biplicata
2,908 observations
Pismo Clam
Tivela stultorum
2,871 observations
Red Abalone
Haliotis rufescens
2,833 observations
Yellow Cellar Slug
Limacus flavus
2,827 observations
Colorful Dirona
Dirona picta
2,821 observations
Fisher's Aeolid
Orienthella piunca
2,763 observations
Rough Limpet
Lottia scabra
2,625 observations
McDonald's Dorid
Limacia mcdonaldi
2,599 observations
Kellet's Whelk
Kelletia kelletii
2,584 observations
California Cone
Californiconus californicus
2,529 observations
California Banana Slug
Ariolimax californicus
2,518 observations
Lesser Two-spot Octopus
Octopus bimaculoides
2,507 observations
Volcano Keyhole Limpet
Fissurella volcano
2,458 observations
Stubby Dendronotid
Dendronotus subramosus
2,384 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)
- Pacific Banana Slug (Ariolimax columbianus)
- Hopkins' Rose Nudibranch (Ceratodoris rosacea)
- California Seahare (Aplysia californica)
- San Diego Dorid (Diaulula sandiegensis)
- The most observed mollusc in California is Garden Snail (Cornu aspersum), with 31,081 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)
- California Spiny Chiton (Nuttallina californica)