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Leopard Slug
Limax maximus
2,404 observations
Asian Clam
Corbicula fluminea
1,112 observations
Brown-lipped Snail
Cepaea nemoralis
592 observations
Eastern Elliptio
Elliptio complanata
566 observations
Milky Slug
Deroceras reticulatum
550 observations
Globose Dome Snail
Ventridens ligera
360 observations
Chinese Mystery Snail
Margarya chinensis
277 observations
Changeable Mantleslug
Megapallifera mutabilis
272 observations
Rounded Snail
Gonyodiscus rotundatus
270 observations
Mucket
Ortmanniana ligamentina
247 observations
Western Dusky Slug
Arion subfuscus
193 observations
Spike
Eurynia dilatata
176 observations
Kidneyshell
Ptychobranchus fasciolaris
151 observations
Meadow Slug
Deroceras laeve
150 observations
Eastern Whitelip
Neohelix albolabris
121 observations
Clubshell Pearly Mussel
Pleurobema clava
118 observations
Northern Riffleshell
Epioblasma rangiana
118 observations
Draparnaud's Glass Snail
Oxychilus draparnaudi
117 observations
White-lip Globe Snail
Mesodon thyroidus
114 observations
Zebra Mussel
Dreissena polymorpha
105 observations
Winding Mantleslug
Philomycus flexuolaris
103 observations
Eastern Floater
Pyganodon cataracta
98 observations
Toga Mantleslug
Philomycus togatus
90 observations
Quick Gloss Snail
Zonitoides arboreus
79 observations
Fatmucket
Lampsilis siliquoidea
66 observations
Japanese Mystery Snail
Heterogen japonica
61 observations
Giant Floater
Pyganodon grandis
60 observations
Marsh Ramshorn
Planorbella trivolvis
60 observations
Hedgehog Slug
Arion intermedius
58 observations
Pointed Campeloma
Campeloma decisum
54 observations
Wavyrayed Lampmussel
Lampsilis fasciola
50 observations
Quagga Mussel
Dreissena bugensis
49 observations
Glossy Pillar
Cochlicopa lubrica
49 observations
Pink Heelsplitter
Potamilus alatus
48 observations
Three-ridge Mussel
Amblema plicata
47 observations
Garden Arion
Arion hortensis
44 observations
Acute Bladder Snail
Physella acuta
39 observations
Black Sandshell
Ligumia recta
38 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
38 observations
Paper Pondshell
Utterbackia imbecillis
37 observations
Rainbow Mussel
Cambarunio iris
37 observations
Black Gloss Snail
Zonitoides nitidus
35 observations
Flutedshell
Lasmigona costata
34 observations
Flamed Tigersnail
Anguispira alternata
34 observations
Plain Pocketbook
Lampsilis cardium
32 observations
Yellow Lampmussel
Lampsilis cariosa
30 observations
Creeper
Strophitus undulatus
27 observations
Alewife Floater
Utterbackiana implicata
22 observations
Round Pigtoe
Pleurobema sintoxia
21 observations
Snuffbox
Epioblasma triquetra
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)
- Eastern Elliptio (Elliptio complanata)
- Milky Slug (Deroceras reticulatum)
- Globose Dome Snail (Ventridens ligera)
- Chinese Mystery Snail (Margarya chinensis)
- Changeable Mantleslug (Megapallifera mutabilis)
- Rounded Snail (Gonyodiscus rotundatus)
- Mucket (Ortmanniana ligamentina)
- The most observed mollusc in Pennsylvania is Leopard Slug (Limax maximus), with 2,404 recorded observations.