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Invasive
Common Periwinkle
Littorina littorea
3,192 observations
Common Atlantic Slippersnail
Crepidula fornicata
2,700 observations
Brown-lipped Snail
Cepaea nemoralis
2,245 observations
Blue Mussel
Mytilus edulis
1,745 observations
West Atlantic Surfclam
Spisula solidissima
1,742 observations
Northern Quahog
Mercenaria mercenaria
1,545 observations
Eastern Oyster
Crassostrea virginica
1,283 observations
Atlantic Bay Scallop
Argopecten irradians
1,227 observations
Atlantic Jackknife
Ensis leei
1,210 observations
Northern Moonsnail
Euspira heros
1,159 observations
Atlantic Ribbed Mussel
Geukensia demissa
1,102 observations
Invasive
European Flat Oyster
Ostrea edulis
821 observations
Knobbed Whelk
Busycon carica
806 observations
Leopard Slug
Limax maximus
770 observations
Eastern Elliptio
Elliptio complanata
723 observations
Soft-shelled Clam
Mya arenaria
712 observations
Common Jingle
Anomia simplex
695 observations
Channeled Whelk
Busycotypus canaliculatus
685 observations
Eastern Mudsnail
Ilyanassa obsoleta
660 observations
Invasive
Rounded Snail
Gonyodiscus rotundatus
562 observations
Atlantic Dogwhelk
Nucella lapillus
534 observations
Blood Ark
Lunarca ovalis
517 observations
Longfin Inshore Squid
Doryteuthis pealeii
423 observations
Shark Eye
Neverita duplicata
420 observations
Flat Periwinkle
Littorina obtusata
410 observations
Threeline Mudsnail
Ilyanassa trivittata
364 observations
Tortoiseshell Limpet
Testudinalia testudinalis
350 observations
Chinese Mystery Snail
Margarya chinensis
340 observations
Asian Clam
Corbicula fluminea
322 observations
Invasive
Japanese Littleneck
Ruditapes philippinarum
321 observations
Eastern Oyster Drill
Urosalpinx cinerea
282 observations
Milky Slug
Deroceras reticulatum
274 observations
Northern Horse Mussel
Modiolus modiolus
269 observations
Common Whelk
Buccinum undatum
255 observations
False Angelwing
Petricolaria pholadiformis
245 observations
Changeable Mantleslug
Megapallifera mutabilis
242 observations
Eastern Floater
Pyganodon cataracta
207 observations
Western Dusky Slug
Arion subfuscus
189 observations
Transverse Ark
Anadara transversa
188 observations
Rough Periwinkle
Littorina saxatilis
182 observations
Eastern Whitelip
Neohelix albolabris
155 observations
Eastern White Slippersnail
Crepidula plana
151 observations
Stout Tagelus
Tagelus plebeius
148 observations
Atlantic Razor
Siliqua costata
137 observations
Wedgeclam
Mesodesma arctatum
134 observations
Freshwater Pearl Mussel
Margaritifera margaritifera
132 observations
Ocean Quahog
Arctica islandica
131 observations
Two-toothed Marsh Snail
Melampus bidentatus
130 observations
Atlantic deep-sea scallop
Placopecten magellanicus
130 observations
Well-ribbed Dove Snail
Costoanachis translirata
119 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 Bay Scallop (Argopecten irradians)
- Atlantic Jackknife (Ensis leei)
- Northern Moonsnail (Euspira heros)
- The most observed mollusc in Massachusetts is Common Periwinkle (Littorina littorea), with 3,192 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)