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Garden Snail
Cornu aspersum
32,964 observations
Opalescent Nudibranch
Hermissenda opalescens
21,149 observations
Button's Banana Slug
Ariolimax buttoni
17,037 observations
California Mussel
Mytilus californianus
14,512 observations
Spotted Dorid
Triopha maculata
11,849 observations
Milk Snail
Otala lactea
11,293 observations
Pacific Banana Slug
Ariolimax columbianus
10,670 observations
Hopkins' Rose Nudibranch
Ceratodoris rosacea
10,549 observations
San Diego Dorid
Diaulula sandiegensis
9,389 observations
Black Tegula
Tegula funebralis
9,021 observations
California Seahare
Aplysia californica
9,014 observations
Monterey Dorid
Doris montereyensis
7,923 observations
Wavy Turban
Megastraea undosa
7,340 observations
Slender Banana Slug
Ariolimax dolichophallus
6,943 observations
Mossy Chiton
Mopalia muscosa
6,406 observations
Gumboot Chiton
Cryptochiton stelleri
6,392 observations
Hilton's Aeolid
Phidiana hiltoni
5,452 observations
California Spiny Chiton
Nuttallina californica
5,413 observations
Owl Limpet
Lottia gigantea
5,395 observations
Noble Dorid
Peltodoris nobilis
5,308 observations
California Aglaja
Navanax inermis
5,134 observations
California Banana Slug
Ariolimax californicus
4,858 observations
Clown Dorid
Triopha catalinae
4,825 observations
Red Sponge Dorid
Rostanga pulchra
4,746 observations
Giant Keyhole Limpet
Megathura crenulata
4,714 observations
White-speckled Dorid
Doriopsilla fulva
4,693 observations
Spanish Shawl
Flabellinopsis iodinea
4,564 observations
White-spotted Sea Goddess
Doriopsilla albopunctata
4,469 observations
Salt-and-pepper Doris
Aegires albopunctatus
4,420 observations
Sorcerer's Dorid
Polycera atra
4,252 observations
Giant Rock Scallop
Crassadoma gigantea
4,007 observations
Fisher's Aeolid
Orienthella piunca
3,892 observations
Branched Dendronotid
Dendronotus venustus
3,857 observations
Decollate Snail
Rumina decollata
3,788 observations
Black Seahare
Aplysia vaccaria
3,589 observations
Norris's Topsnail
Norrisia norrisii
3,478 observations
Gould Beanclam
Donax gouldii
3,454 observations
Red Abalone
Haliotis rufescens
3,439 observations
Milky Slug
Deroceras reticulatum
3,336 observations
Yellow Cellar Slug
Limacus flavus
3,299 observations
Colorful Dirona
Dirona picta
3,206 observations
Lesser Two-spot Octopus
Octopus bimaculoides
3,171 observations
Pismo Clam
Tivela stultorum
3,097 observations
McDonald's Dorid
Limacia mcdonaldi
3,016 observations
Purple Olive Snail
Callianax biplicata
3,014 observations
Rough Limpet
Lottia scabra
2,806 observations
California Cone
Californiconus californicus
2,727 observations
Kellet's Whelk
Kelletia kelletii
2,718 observations
Stubby Dendronotid
Dendronotus subramosus
2,647 observations
Volcano Keyhole Limpet
Fissurella volcano
2,645 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)
- San Diego Dorid (Diaulula sandiegensis)
- Black Tegula (Tegula funebralis)
- The most observed mollusc in California is Garden Snail (Cornu aspersum), with 32,964 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)