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Common Periwinkle
Littorina littorea
474 observations
Common Atlantic Slippersnail
Crepidula fornicata
434 observations
Brown-lipped Snail
Cepaea nemoralis
362 observations
Atlantic Ribbed Mussel
Geukensia demissa
286 observations
Northern Quahog
Mercenaria mercenaria
276 observations
Blue Mussel
Mytilus edulis
210 observations
Channeled Whelk
Busycotypus canaliculatus
177 observations
Atlantic Bay Scallop
Argopecten irradians
166 observations
West Atlantic Surfclam
Spisula solidissima
139 observations
Eastern Oyster
Crassostrea virginica
136 observations
Eastern Oyster Drill
Urosalpinx cinerea
127 observations
Common Jingle
Anomia simplex
123 observations
Eastern Mudsnail
Ilyanassa obsoleta
108 observations
Knobbed Whelk
Busycon carica
95 observations
Leopard Slug
Limax maximus
93 observations
Changeable Mantleslug
Megapallifera mutabilis
63 observations
Shark Eye
Neverita duplicata
59 observations
Soft-shelled Clam
Mya arenaria
59 observations
Threeline Mudsnail
Ilyanassa trivittata
51 observations
Common Whelk
Buccinum undatum
49 observations
Northern Lacuna
Lacuna vincta
48 observations
Atlantic Jackknife
Ensis leei
47 observations
Blood Ark
Lunarca ovalis
43 observations
Flat Periwinkle
Littorina obtusata
42 observations
Transverse Ark
Anadara transversa
41 observations
Naked Sea Butterfly
Clione limacina
37 observations
Northern Moonsnail
Euspira heros
32 observations
Stout Tagelus
Tagelus plebeius
29 observations
Atlantic Dogwhelk
Nucella lapillus
29 observations
Well-ribbed Dove Snail
Costoanachis translirata
28 observations
Rough Periwinkle
Littorina saxatilis
26 observations
Eastern Whitelip
Neohelix albolabris
26 observations
Longfin Inshore Squid
Doryteuthis pealeii
25 observations
Chinese Mystery Snail
Margarya chinensis
25 observations
Meadow Slug
Deroceras laeve
24 observations
False Angelwing
Petricolaria pholadiformis
24 observations
Eastern Elliptio
Elliptio complanata
23 observations
Rounded Snail
Gonyodiscus rotundatus
23 observations
Asian Clam
Corbicula fluminea
21 observations
Milky Slug
Deroceras reticulatum
20 observations
Chestnut Clam
Isocrassina castanea
19 observations
Western Dusky Slug
Arion subfuscus
18 observations
Lunate Dove Shell
Astyris lunata
17 observations
Tortoiseshell Limpet
Testudinalia testudinalis
17 observations
Northern Horse Mussel
Modiolus modiolus
15 observations
Spotted Moonsnail
Euspira triseriata
15 observations
Cross-hatched Lucine
Divalinga quadrisulcata
15 observations
Bushy-backed Nudibranch
Dendronotus frondosus
14 observations
Northern Cardita
Cyclocardia borealis
14 observations
Toga Mantleslug
Philomycus togatus
13 observations
Frequently Asked Questions
- The 10 most common molluscs in Rhode Island are:
- Common Periwinkle (Littorina littorea)
- Common Atlantic Slippersnail (Crepidula fornicata)
- Brown-lipped Snail (Cepaea nemoralis)
- Atlantic Ribbed Mussel (Geukensia demissa)
- Northern Quahog (Mercenaria mercenaria)
- Blue Mussel (Mytilus edulis)
- Channeled Whelk (Busycotypus canaliculatus)
- Atlantic Bay Scallop (Argopecten irradians)
- West Atlantic Surfclam (Spisula solidissima)
- Eastern Oyster (Crassostrea virginica)
- The most observed mollusc in Rhode Island is Common Periwinkle (Littorina littorea), with 474 recorded observations.