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Invasive
Common Periwinkle
Littorina littorea
2,775 observations
Common Atlantic Slippersnail
Crepidula fornicata
2,438 observations
Brown-lipped Snail
Cepaea nemoralis
1,940 observations
Blue Mussel
Mytilus edulis
1,688 observations
West Atlantic Surfclam
Spisula solidissima
1,597 observations
Northern Quahog
Mercenaria mercenaria
1,410 observations
Eastern Oyster
Crassostrea virginica
1,157 observations
Atlantic Jackknife
Ensis leei
1,112 observations
Atlantic Bay Scallop
Argopecten irradians
1,084 observations
Northern Moonsnail
Euspira heros
1,043 observations
Atlantic Ribbed Mussel
Geukensia demissa
984 observations
Invasive
European Flat Oyster
Ostrea edulis
798 observations
Knobbed Whelk
Busycon carica
715 observations
Leopard Slug
Limax maximus
709 observations
Soft-shelled Clam
Mya arenaria
657 observations
Eastern Elliptio
Elliptio complanata
654 observations
Channeled Whelk
Busycotypus canaliculatus
609 observations
Common Jingle
Anomia simplex
607 observations
Eastern Mudsnail
Ilyanassa obsoleta
587 observations
Invasive
Rounded Snail
Gonyodiscus rotundatus
515 observations
Atlantic Dogwhelk
Nucella lapillus
491 observations
Blood Ark
Lunarca ovalis
477 observations
Flat Periwinkle
Littorina obtusata
381 observations
Longfin Inshore Squid
Doryteuthis pealeii
376 observations
Shark Eye
Neverita duplicata
365 observations
Chinese Mystery Snail
Margarya chinensis
331 observations
Threeline Mudsnail
Ilyanassa trivittata
330 observations
Tortoiseshell Limpet
Testudinalia testudinalis
317 observations
Asian Clam
Corbicula fluminea
305 observations
Milky Slug
Deroceras reticulatum
271 observations
Northern Horse Mussel
Modiolus modiolus
248 observations
Common Whelk
Buccinum undatum
243 observations
False Angelwing
Petricolaria pholadiformis
228 observations
Changeable Mantleslug
Megapallifera mutabilis
227 observations
Invasive
Japanese Littleneck
Ruditapes philippinarum
211 observations
Eastern Oyster Drill
Urosalpinx cinerea
195 observations
Eastern Floater
Pyganodon cataracta
187 observations
Rough Periwinkle
Littorina saxatilis
171 observations
Transverse Ark
Anadara transversa
165 observations
Western Dusky Slug
Arion subfuscus
159 observations
Eastern Whitelip
Neohelix albolabris
137 observations
Stout Tagelus
Tagelus plebeius
136 observations
Eastern White Slippersnail
Crepidula plana
135 observations
Atlantic Razor
Siliqua costata
135 observations
Wedgeclam
Mesodesma arctatum
127 observations
Ocean Quahog
Arctica islandica
123 observations
Atlantic deep-sea scallop
Placopecten magellanicus
120 observations
Two-toothed Marsh Snail
Melampus bidentatus
117 observations
Meadow Slug
Deroceras laeve
115 observations
Freshwater Pearl Mussel
Margaritifera margaritifera
114 observations
Frequently Asked Questions
- The 10 most common molluscs in Massachusetts are:
- Common Periwinkle (Littorina littorea)
- Common Atlantic Slippersnail (Crepidula fornicata)
- Brown-lipped Snail (Cepaea nemoralis)
- Blue Mussel (Mytilus edulis)
- West Atlantic Surfclam (Spisula solidissima)
- Northern Quahog (Mercenaria mercenaria)
- Eastern Oyster (Crassostrea virginica)
- Atlantic Jackknife (Ensis leei)
- Atlantic Bay Scallop (Argopecten irradians)
- Northern Moonsnail (Euspira heros)
- The most observed mollusc in Massachusetts is Common Periwinkle (Littorina littorea), with 2,775 recorded observations.
- Some of the most commonly observed invasive molluscs in Massachusetts include:
- Common Periwinkle (Littorina littorea)
- European Flat Oyster (Ostrea edulis)
- Rounded Snail (Gonyodiscus rotundatus)
- Japanese Littleneck (Ruditapes philippinarum)