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Pacific Banana Slug
Ariolimax columbianus
9,888 observations
Pacific Sideband
Monadenia fidelis
4,814 observations
Horned Nudibranch
Hermissenda crassicornis
2,376 observations
Garden Snail
Cornu aspersum
2,024 observations
Monterey Dorid
Doris montereyensis
1,620 observations
Leopard Slug
Limax maximus
1,491 observations
California Mussel
Mytilus californianus
1,319 observations
Striped Dogwinkle
Nucella ostrina
1,281 observations
Robust Lancetooth Snail
Haplotrema vancouverense
1,158 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,110 observations
Pleated Juga
Juga plicifera
947 observations
Black Slug
Arion ater
942 observations
Milky Slug
Deroceras reticulatum
882 observations
Gumboot Chiton
Cryptochiton stelleri
856 observations
Black Leather Chiton
Katharina tunicata
838 observations
Red Sponge Dorid
Rostanga pulchra
791 observations
Three-lined Aeolid
Orienthella trilineata
788 observations
Western Pearlshell
Margaritifera falcata
785 observations
Frilled Dogwinkle
Nucella lamellosa
758 observations
Northern Leopard Dorid
Diaulula odonoghuei
682 observations
Branched Dendronotid
Dendronotus venustus
660 observations
Black Tegula
Tegula funebralis
609 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
607 observations
Yellow Cellar Slug
Limacus flavus
594 observations
Northwest Hesperian
Vespericola columbianus
572 observations
Asian Clam
Corbicula fluminea
545 observations
Lined Chiton
Tonicella lineata
510 observations
Pacific Razor Clam
Siliqua patula
509 observations
Oregon forestsnail
Allogona townsendiana
473 observations
Mossy Chiton
Mopalia muscosa
462 observations
Noble Dorid
Peltodoris nobilis
444 observations
Reticulate Taildropper
Prophysaon andersonii
363 observations
Chocolate Aeolid
Margina cocoachroma
344 observations
White-lined Dirona
Dirona albolineata
311 observations
Fingered Limpet
Lottia digitalis
308 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
288 observations
Rough Keyhole Limpet
Diodora aspera
285 observations
Hammerhead Doto
Doto amyra
279 observations
Purple Olive Snail
Callianax biplicata
267 observations
Hind's Chiton
Mopalia hindsii
253 observations
barnacle-eating dorid
Onchidoris bilamellata
248 observations
Fisher's Aeolid
Orienthella piunca
245 observations
Opalescent Inshore Squid
Doryteuthis opalescens
242 observations
Invasive
Purple Mahogany Clam
Nuttallia obscurata
234 observations
Nuttall's Cockle
Clinocardium nuttallii
232 observations
White Dendronotus
Dendronotus albus
224 observations
Clown Dorid
Triopha catalinae
211 observations
Opalescent Nudibranch
Hermissenda opalescens
208 observations
Channeled Basket Snail
Caesia fossata
185 observations
Beaded Lancetooth Snail
Ancotrema sportella
174 observations
Frequently Asked Questions
- The 10 most common molluscs in Oregon are:
- Pacific Banana Slug (Ariolimax columbianus)
- Pacific Sideband (Monadenia fidelis)
- Horned Nudibranch (Hermissenda crassicornis)
- Garden Snail (Cornu aspersum)
- Monterey Dorid (Doris montereyensis)
- Leopard Slug (Limax maximus)
- California Mussel (Mytilus californianus)
- Striped Dogwinkle (Nucella ostrina)
- Robust Lancetooth Snail (Haplotrema vancouverense)
- White-and-orange-tipped Nudibranch (Antiopella fusca)
- The most observed mollusc in Oregon is Pacific Banana Slug (Ariolimax columbianus), with 9,888 recorded observations.
- Some of the most commonly observed invasive molluscs in Oregon include:
- Purple Mahogany Clam (Nuttallia obscurata)