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Invasive
Common Periwinkle
Littorina littorea
2,928 observations
Common Atlantic Slippersnail
Crepidula fornicata
2,566 observations
Brown-lipped Snail
Cepaea nemoralis
2,141 observations
Blue Mussel
Mytilus edulis
1,727 observations
West Atlantic Surfclam
Spisula solidissima
1,675 observations
Northern Quahog
Mercenaria mercenaria
1,472 observations
Eastern Oyster
Crassostrea virginica
1,256 observations
Atlantic Jackknife
Ensis leei
1,171 observations
Atlantic Bay Scallop
Argopecten irradians
1,161 observations
Northern Moonsnail
Euspira heros
1,116 observations
Atlantic Ribbed Mussel
Geukensia demissa
1,035 observations
Invasive
European Flat Oyster
Ostrea edulis
815 observations
Knobbed Whelk
Busycon carica
772 observations
Leopard Slug
Limax maximus
731 observations
Eastern Elliptio
Elliptio complanata
696 observations
Soft-shelled Clam
Mya arenaria
687 observations
Channeled Whelk
Busycotypus canaliculatus
656 observations
Common Jingle
Anomia simplex
647 observations
Eastern Mudsnail
Ilyanassa obsoleta
613 observations
Invasive
Rounded Snail
Gonyodiscus rotundatus
549 observations
Atlantic Dogwhelk
Nucella lapillus
520 observations
Blood Ark
Lunarca ovalis
499 observations
Flat Periwinkle
Littorina obtusata
405 observations
Longfin Inshore Squid
Doryteuthis pealeii
405 observations
Shark Eye
Neverita duplicata
393 observations
Threeline Mudsnail
Ilyanassa trivittata
346 observations
Tortoiseshell Limpet
Testudinalia testudinalis
343 observations
Chinese Mystery Snail
Margarya chinensis
339 observations
Asian Clam
Corbicula fluminea
313 observations
Invasive
Japanese Littleneck
Ruditapes philippinarum
284 observations
Milky Slug
Deroceras reticulatum
274 observations
Northern Horse Mussel
Modiolus modiolus
258 observations
Common Whelk
Buccinum undatum
253 observations
Changeable Mantleslug
Megapallifera mutabilis
235 observations
False Angelwing
Petricolaria pholadiformis
234 observations
Eastern Oyster Drill
Urosalpinx cinerea
208 observations
Eastern Floater
Pyganodon cataracta
204 observations
Rough Periwinkle
Littorina saxatilis
179 observations
Transverse Ark
Anadara transversa
176 observations
Western Dusky Slug
Arion subfuscus
171 observations
Eastern Whitelip
Neohelix albolabris
152 observations
Eastern White Slippersnail
Crepidula plana
140 observations
Stout Tagelus
Tagelus plebeius
139 observations
Atlantic Razor
Siliqua costata
136 observations
Ocean Quahog
Arctica islandica
129 observations
Wedgeclam
Mesodesma arctatum
129 observations
Freshwater Pearl Mussel
Margaritifera margaritifera
128 observations
Atlantic deep-sea scallop
Placopecten magellanicus
127 observations
Two-toothed Marsh Snail
Melampus bidentatus
126 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 2,928 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)