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Invasive
Common Periwinkle
Littorina littorea
2,862 observations
Common Atlantic Slippersnail
Crepidula fornicata
2,507 observations
Brown-lipped Snail
Cepaea nemoralis
2,053 observations
Blue Mussel
Mytilus edulis
1,709 observations
West Atlantic Surfclam
Spisula solidissima
1,630 observations
Northern Quahog
Mercenaria mercenaria
1,441 observations
Eastern Oyster
Crassostrea virginica
1,192 observations
Atlantic Jackknife
Ensis leei
1,140 observations
Atlantic Bay Scallop
Argopecten irradians
1,125 observations
Northern Moonsnail
Euspira heros
1,087 observations
Atlantic Ribbed Mussel
Geukensia demissa
1,009 observations
Invasive
European Flat Oyster
Ostrea edulis
811 observations
Knobbed Whelk
Busycon carica
744 observations
Leopard Slug
Limax maximus
715 observations
Eastern Elliptio
Elliptio complanata
676 observations
Soft-shelled Clam
Mya arenaria
672 observations
Channeled Whelk
Busycotypus canaliculatus
632 observations
Common Jingle
Anomia simplex
626 observations
Eastern Mudsnail
Ilyanassa obsoleta
602 observations
Invasive
Rounded Snail
Gonyodiscus rotundatus
532 observations
Atlantic Dogwhelk
Nucella lapillus
510 observations
Blood Ark
Lunarca ovalis
486 observations
Flat Periwinkle
Littorina obtusata
394 observations
Longfin Inshore Squid
Doryteuthis pealeii
391 observations
Shark Eye
Neverita duplicata
380 observations
Threeline Mudsnail
Ilyanassa trivittata
337 observations
Tortoiseshell Limpet
Testudinalia testudinalis
337 observations
Chinese Mystery Snail
Margarya chinensis
337 observations
Asian Clam
Corbicula fluminea
311 observations
Milky Slug
Deroceras reticulatum
273 observations
Invasive
Japanese Littleneck
Ruditapes philippinarum
263 observations
Common Whelk
Buccinum undatum
251 observations
Northern Horse Mussel
Modiolus modiolus
249 observations
Changeable Mantleslug
Megapallifera mutabilis
232 observations
False Angelwing
Petricolaria pholadiformis
231 observations
Eastern Oyster Drill
Urosalpinx cinerea
199 observations
Eastern Floater
Pyganodon cataracta
199 observations
Rough Periwinkle
Littorina saxatilis
175 observations
Transverse Ark
Anadara transversa
167 observations
Western Dusky Slug
Arion subfuscus
161 observations
Eastern Whitelip
Neohelix albolabris
148 observations
Stout Tagelus
Tagelus plebeius
139 observations
Eastern White Slippersnail
Crepidula plana
136 observations
Atlantic Razor
Siliqua costata
136 observations
Wedgeclam
Mesodesma arctatum
128 observations
Ocean Quahog
Arctica islandica
126 observations
Freshwater Pearl Mussel
Margaritifera margaritifera
123 observations
Two-toothed Marsh Snail
Melampus bidentatus
122 observations
Atlantic deep-sea scallop
Placopecten magellanicus
122 observations
Meadow Slug
Deroceras laeve
115 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 2,862 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)
- Some of the most commonly observed native molluscs in Massachusetts include:
- Soft-shelled Clam (Mya arenaria)