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Pacific Banana Slug
Ariolimax columbianus
16,901 observations
Horned Nudibranch
Hermissenda crassicornis
8,311 observations
Black Slug
Arion ater
3,932 observations
Frilled Dogwinkle
Nucella lamellosa
3,625 observations
Pacific Sideband
Monadenia fidelis
3,354 observations
Monterey Dorid
Doris montereyensis
2,995 observations
Brown-lipped Snail
Cepaea nemoralis
2,958 observations
Lewis's Moon Snail
Neverita lewisii
2,958 observations
Leopard Slug
Limax maximus
2,943 observations
White-lined Dirona
Dirona albolineata
2,422 observations
Garden Snail
Cornu aspersum
2,276 observations
Mossy Chiton
Mopalia muscosa
1,947 observations
Lined Chiton
Tonicella lineata
1,857 observations
Nuttall's Cockle
Clinocardium nuttallii
1,666 observations
Northern Leopard Dorid
Diaulula odonoghuei
1,586 observations
barnacle-eating dorid
Onchidoris bilamellata
1,409 observations
Giant Nudibranch
Dendronotus iris
1,329 observations
Oregon forestsnail
Allogona townsendiana
1,310 observations
Branched Dendronotid
Dendronotus venustus
1,308 observations
Gumboot Chiton
Cryptochiton stelleri
1,187 observations
Woody Chiton
Mopalia lignosa
1,174 observations
Three-lined Aeolid
Orienthella trilineata
1,174 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,106 observations
Red Sponge Dorid
Rostanga pulchra
1,016 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
980 observations
Hooded Nudibranch
Melibe leonina
971 observations
Purple Mahogany Clam
Nuttallia obscurata
949 observations
Milky Slug
Deroceras reticulatum
926 observations
Striped Dogwinkle
Nucella ostrina
903 observations
Modest Clown Dorid
Triopha modesta
898 observations
Black Leather Chiton
Katharina tunicata
846 observations
Robust Lancetooth Snail
Haplotrema vancouverense
845 observations
Noble Dorid
Peltodoris nobilis
744 observations
Green Falsejingle
Pododesmus macrochisma
738 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
712 observations
Rough Keyhole Limpet
Diodora aspera
696 observations
East Pacific Red Octopus
Octopus rubescens
657 observations
Opalescent Inshore Squid
Doryteuthis opalescens
594 observations
Rough Piddock
Zirfaea pilsbryi
561 observations
Northwest Hesperian
Vespericola columbianus
546 observations
Striped Nudibranch
Armina californica
513 observations
Pacific Razor Clam
Siliqua patula
509 observations
Pacific Oyster
Magallana gigas
508 observations
Rocky Aeolid
Eubranchulus rupium
504 observations
Butter Clam
Saxidomus gigantea
495 observations
Festive Tritonid
Tritonia festiva
492 observations
Reticulate Taildropper
Prophysaon andersonii
481 observations
Heath's Dorid
Geitodoris heathi
470 observations
California Mussel
Mytilus californianus
453 observations
Mask Limpet
Lottia persona
427 observations
Frequently Asked Questions
- The 10 most common molluscs in Washington are:
- Pacific Banana Slug (Ariolimax columbianus)
- Horned Nudibranch (Hermissenda crassicornis)
- Black Slug (Arion ater)
- Frilled Dogwinkle (Nucella lamellosa)
- Pacific Sideband (Monadenia fidelis)
- Monterey Dorid (Doris montereyensis)
- Brown-lipped Snail (Cepaea nemoralis)
- Lewis's Moon Snail (Neverita lewisii)
- Leopard Slug (Limax maximus)
- White-lined Dirona (Dirona albolineata)
- The most observed mollusc in Washington is Pacific Banana Slug (Ariolimax columbianus), with 16,901 recorded observations.