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Garden Snail
Cornu aspersum
33,638 observations
Opalescent Nudibranch
Hermissenda opalescens
21,660 observations
California Mussel
Mytilus californianus
18,568 observations
Button's Banana Slug
Ariolimax buttoni
17,400 observations
Spotted Dorid
Triopha maculata
12,194 observations
Milk Snail
Otala lactea
11,490 observations
Pacific Banana Slug
Ariolimax columbianus
11,041 observations
Hopkins' Rose Nudibranch
Ceratodoris rosacea
10,983 observations
San Diego Dorid
Diaulula sandiegensis
9,686 observations
Black Tegula
Tegula funebralis
9,489 observations
California Seahare
Aplysia californica
9,309 observations
Monterey Dorid
Doris montereyensis
8,211 observations
Wavy Turban
Megastraea undosa
7,570 observations
Slender Banana Slug
Ariolimax dolichophallus
7,055 observations
Mossy Chiton
Mopalia muscosa
6,557 observations
Gumboot Chiton
Cryptochiton stelleri
6,539 observations
Owl Limpet
Lottia gigantea
5,580 observations
Hilton's Aeolid
Phidiana hiltoni
5,567 observations
Noble Dorid
Peltodoris nobilis
5,469 observations
California Spiny Chiton
Nuttallina californica
5,451 observations
California Aglaja
Navanax inermis
5,295 observations
California Banana Slug
Ariolimax californicus
4,961 observations
Clown Dorid
Triopha catalinae
4,921 observations
White-speckled Dorid
Doriopsilla fulva
4,802 observations
Giant Keyhole Limpet
Megathura crenulata
4,787 observations
Red Sponge Dorid
Rostanga pulchra
4,785 observations
Sorcerer's Dorid
Polycera atra
4,685 observations
Spanish Shawl
Flabellinopsis iodinea
4,651 observations
White-spotted Sea Goddess
Doriopsilla albopunctata
4,510 observations
Salt-and-pepper Doris
Aegires albopunctatus
4,496 observations
Giant Rock Scallop
Crassadoma gigantea
4,188 observations
Fisher's Aeolid
Orienthella piunca
3,970 observations
Decollate Snail
Rumina decollata
3,924 observations
Branched Dendronotid
Dendronotus venustus
3,910 observations
Black Seahare
Aplysia vaccaria
3,639 observations
Norris's Topsnail
Norrisia norrisii
3,620 observations
Gould Beanclam
Donax gouldii
3,605 observations
Red Abalone
Haliotis rufescens
3,564 observations
Yellow Cellar Slug
Limacus flavus
3,356 observations
Milky Slug
Deroceras reticulatum
3,347 observations
Pismo Clam
Tivela stultorum
3,347 observations
Colorful Dirona
Dirona picta
3,284 observations
Lesser Two-spot Octopus
Octopus bimaculoides
3,257 observations
Purple Olive Snail
Callianax biplicata
3,076 observations
Rough Limpet
Lottia scabra
3,044 observations
McDonald's Dorid
Limacia mcdonaldi
3,043 observations
California Cone
Californiconus californicus
2,821 observations
Kellet's Whelk
Kelletia kelletii
2,778 observations
Volcano Keyhole Limpet
Fissurella volcano
2,707 observations
Heath's Dorid
Geitodoris heathi
2,682 observations
Frequently Asked Questions
- The 10 most common molluscs in California are:
- Garden Snail (Cornu aspersum)
- Opalescent Nudibranch (Hermissenda opalescens)
- California Mussel (Mytilus californianus)
- Button's Banana Slug (Ariolimax buttoni)
- 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 33,638 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)
- Owl Limpet (Lottia gigantea)