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Garden Snail
Cornu aspersum
32,127 observations
Opalescent Nudibranch
Hermissenda opalescens
19,809 observations
Button's Banana Slug
Ariolimax buttoni
16,382 observations
California Mussel
Mytilus californianus
14,157 observations
Spotted Dorid
Triopha maculata
11,291 observations
Milk Snail
Otala lactea
10,929 observations
Pacific Banana Slug
Ariolimax columbianus
9,765 observations
Hopkins' Rose Nudibranch
Ceratodoris rosacea
9,661 observations
California Seahare
Aplysia californica
8,821 observations
San Diego Dorid
Diaulula sandiegensis
8,807 observations
Black Tegula
Tegula funebralis
8,771 observations
Monterey Dorid
Doris montereyensis
7,653 observations
Wavy Turban
Megastraea undosa
7,129 observations
Slender Banana Slug
Ariolimax dolichophallus
6,781 observations
Mossy Chiton
Mopalia muscosa
6,208 observations
Gumboot Chiton
Cryptochiton stelleri
6,169 observations
California Spiny Chiton
Nuttallina californica
5,367 observations
Hilton's Aeolid
Phidiana hiltoni
5,290 observations
Owl Limpet
Lottia gigantea
5,184 observations
Noble Dorid
Peltodoris nobilis
5,118 observations
California Aglaja
Navanax inermis
4,934 observations
California Banana Slug
Ariolimax californicus
4,669 observations
Clown Dorid
Triopha catalinae
4,606 observations
Giant Keyhole Limpet
Megathura crenulata
4,565 observations
Red Sponge Dorid
Rostanga pulchra
4,523 observations
White-speckled Dorid
Doriopsilla fulva
4,377 observations
Spanish Shawl
Flabellinopsis iodinea
4,301 observations
White-spotted Sea Goddess
Doriopsilla albopunctata
4,159 observations
Salt-and-pepper Doris
Aegires albopunctatus
4,100 observations
Giant Rock Scallop
Crassadoma gigantea
3,929 observations
Decollate Snail
Rumina decollata
3,760 observations
Sorcerer's Dorid
Polycera atra
3,742 observations
Branched Dendronotid
Dendronotus venustus
3,592 observations
Black Seahare
Aplysia vaccaria
3,500 observations
Fisher's Aeolid
Orienthella piunca
3,452 observations
Norris's Topsnail
Norrisia norrisii
3,380 observations
Gould Beanclam
Donax gouldii
3,373 observations
Yellow Cellar Slug
Limacus flavus
3,169 observations
Milky Slug
Deroceras reticulatum
3,097 observations
Red Abalone
Haliotis rufescens
3,052 observations
Colorful Dirona
Dirona picta
2,984 observations
Pismo Clam
Tivela stultorum
2,960 observations
Purple Olive Snail
Callianax biplicata
2,960 observations
McDonald's Dorid
Limacia mcdonaldi
2,759 observations
Rough Limpet
Lottia scabra
2,678 observations
Kellet's Whelk
Kelletia kelletii
2,645 observations
California Cone
Californiconus californicus
2,641 observations
Stubby Dendronotid
Dendronotus subramosus
2,570 observations
Lesser Two-spot Octopus
Octopus bimaculoides
2,570 observations
Volcano Keyhole Limpet
Fissurella volcano
2,539 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 32,127 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)