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Leopard Slug
Limax maximus
2,251 observations
Asian Clam
Corbicula fluminea
1,067 observations
Brown-lipped Snail
Cepaea nemoralis
527 observations
Milky Slug
Deroceras reticulatum
448 observations
Eastern Elliptio
Elliptio complanata
390 observations
Globose Dome Snail
Ventridens ligera
275 observations
Chinese Mystery Snail
Margarya chinensis
274 observations
Mucket
Ortmanniana ligamentina
246 observations
Changeable Mantleslug
Megapallifera mutabilis
219 observations
Rounded Snail
Gonyodiscus rotundatus
195 observations
Western Dusky Slug
Arion subfuscus
187 observations
Spike
Eurynia dilatata
168 observations
Kidneyshell
Ptychobranchus fasciolaris
138 observations
Northern Riffleshell
Epioblasma rangiana
113 observations
Meadow Slug
Deroceras laeve
110 observations
Clubshell Pearly Mussel
Pleurobema clava
104 observations
Zebra Mussel
Dreissena polymorpha
104 observations
White-lip Globe Snail
Mesodon thyroidus
104 observations
Eastern Whitelip
Neohelix albolabris
99 observations
Eastern Floater
Pyganodon cataracta
96 observations
Draparnaud's Glass Snail
Oxychilus draparnaudi
84 observations
Winding Mantleslug
Philomycus flexuolaris
77 observations
Quick Gloss Snail
Zonitoides arboreus
76 observations
Toga Mantleslug
Philomycus togatus
70 observations
Fatmucket
Lampsilis siliquoidea
61 observations
Giant Floater
Pyganodon grandis
58 observations
Pointed Campeloma
Campeloma decisum
52 observations
Marsh Ramshorn
Planorbella trivolvis
48 observations
Quagga Mussel
Dreissena bugensis
48 observations
Wavyrayed Lampmussel
Lampsilis fasciola
48 observations
Glossy Pillar
Cochlicopa lubrica
48 observations
Pink Heelsplitter
Potamilus alatus
45 observations
Three-ridge Mussel
Amblema plicata
45 observations
Hedgehog Slug
Arion intermedius
45 observations
Garden Arion
Arion hortensis
37 observations
Paper Pondshell
Utterbackia imbecillis
37 observations
Japanese Mystery Snail
Heterogen japonica
37 observations
Black Sandshell
Ligumia recta
36 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
36 observations
Flutedshell
Lasmigona costata
34 observations
Acute Bladder Snail
Physella acuta
33 observations
Black Gloss Snail
Zonitoides nitidus
31 observations
Plain Pocketbook
Lampsilis cardium
30 observations
Creeper
Strophitus undulatus
27 observations
Flamed Tigersnail
Anguispira alternata
25 observations
Rainbow Mussel
Cambarunio iris
25 observations
Yellow Lampmussel
Lampsilis cariosa
22 observations
Round Pigtoe
Pleurobema sintoxia
21 observations
Snuffbox
Epioblasma triquetra
21 observations
Alewife Floater
Utterbackiana implicata
21 observations
Frequently Asked Questions
- The 10 most common molluscs in Pennsylvania are:
- Leopard Slug (Limax maximus)
- Asian Clam (Corbicula fluminea)
- Brown-lipped Snail (Cepaea nemoralis)
- Milky Slug (Deroceras reticulatum)
- Eastern Elliptio (Elliptio complanata)
- Globose Dome Snail (Ventridens ligera)
- Chinese Mystery Snail (Margarya chinensis)
- Mucket (Ortmanniana ligamentina)
- Changeable Mantleslug (Megapallifera mutabilis)
- Rounded Snail (Gonyodiscus rotundatus)
- The most observed mollusc in Pennsylvania is Leopard Slug (Limax maximus), with 2,251 recorded observations.