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Invasive
Common Periwinkle
Littorina littorea
3,269 observations
Common Atlantic Slippersnail
Crepidula fornicata
2,833 observations
Brown-lipped Snail
Cepaea nemoralis
2,447 observations
West Atlantic Surfclam
Spisula solidissima
1,779 observations
Blue Mussel
Mytilus edulis
1,751 observations
Northern Quahog
Mercenaria mercenaria
1,615 observations
Eastern Oyster
Crassostrea virginica
1,318 observations
Atlantic Bay Scallop
Argopecten irradians
1,304 observations
Atlantic Jackknife
Ensis leei
1,249 observations
Northern Moonsnail
Euspira heros
1,217 observations
Atlantic Ribbed Mussel
Geukensia demissa
1,165 observations
Knobbed Whelk
Busycon carica
840 observations
Invasive
European Flat Oyster
Ostrea edulis
827 observations
Leopard Slug
Limax maximus
792 observations
Eastern Elliptio
Elliptio complanata
750 observations
Common Jingle
Anomia simplex
740 observations
Soft-shelled Clam
Mya arenaria
729 observations
Channeled Whelk
Busycotypus canaliculatus
713 observations
Eastern Mudsnail
Ilyanassa obsoleta
684 observations
Invasive
Rounded Snail
Gonyodiscus rotundatus
568 observations
Atlantic Dogwhelk
Nucella lapillus
546 observations
Blood Ark
Lunarca ovalis
526 observations
Flat Periwinkle
Littorina obtusata
439 observations
Shark Eye
Neverita duplicata
438 observations
Longfin Inshore Squid
Doryteuthis pealeii
438 observations
Threeline Mudsnail
Ilyanassa trivittata
376 observations
Chinese Mystery Snail
Margarya chinensis
354 observations
Common Tortoiseshell Limpet
Testudinalia testudinalis
352 observations
Asian Clam
Corbicula fluminea
333 observations
Invasive
Japanese Littleneck
Ruditapes philippinarum
330 observations
Eastern Oyster Drill
Urosalpinx cinerea
293 observations
Milky Slug
Deroceras reticulatum
276 observations
Northern Horse Mussel
Modiolus modiolus
275 observations
Common Whelk
Buccinum undatum
265 observations
False Angelwing
Petricolaria pholadiformis
255 observations
Changeable Mantleslug
Megapallifera mutabilis
243 observations
Eastern Floater
Pyganodon cataracta
213 observations
Western Dusky Slug
Arion subfuscus
201 observations
Transverse Ark
Anadara transversa
197 observations
Rough Periwinkle
Littorina saxatilis
190 observations
Eastern White Slippersnail
Crepidula plana
157 observations
Eastern Whitelip
Neohelix albolabris
157 observations
Stout Tagelus
Tagelus plebeius
152 observations
Atlantic Razor
Siliqua costata
143 observations
Two-toothed Marsh Snail
Melampus bidentatus
139 observations
Ocean Quahog
Arctica islandica
137 observations
Atlantic deep-sea scallop
Placopecten magellanicus
137 observations
Wedgeclam
Mesodesma arctatum
137 observations
Well-ribbed Dove Snail
Costoanachis translirata
135 observations
Freshwater Pearl Mussel
Margaritifera margaritifera
133 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)
- West Atlantic Surfclam (Spisula solidissima)
- Blue Mussel (Mytilus edulis)
- Northern Quahog (Mercenaria mercenaria)
- Eastern Oyster (Crassostrea virginica)
- Atlantic Bay Scallop (Argopecten irradians)
- Atlantic Jackknife (Ensis leei)
- Northern Moonsnail (Euspira heros)
- The most observed mollusc in Massachusetts is Common Periwinkle (Littorina littorea), with 3,269 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)