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Leopard Slug
Limax maximus
2,560 observations
Asian Clam
Corbicula fluminea
1,127 observations
Eastern Elliptio
Elliptio complanata
738 observations
Brown-lipped Snail
Cepaea nemoralis
628 observations
Milky Slug
Deroceras reticulatum
560 observations
Globose Dome Snail
Ventridens ligera
361 observations
Changeable Mantleslug
Megapallifera mutabilis
287 observations
Rounded Snail
Gonyodiscus rotundatus
279 observations
Chinese Mystery Snail
Margarya chinensis
279 observations
Mucket
Ortmanniana ligamentina
248 observations
Western Dusky Slug
Arion subfuscus
207 observations
Spike
Eurynia dilatata
178 observations
Meadow Slug
Deroceras laeve
152 observations
Kidneyshell
Ptychobranchus fasciolaris
151 observations
Eastern Whitelip
Neohelix albolabris
126 observations
Winding Mantleslug
Philomycus flexuolaris
122 observations
Clubshell Pearly Mussel
Pleurobema clava
121 observations
Northern Riffleshell
Epioblasma rangiana
119 observations
Draparnaud's Glass Snail
Oxychilus draparnaudi
118 observations
White-lip Globe Snail
Mesodon thyroidus
114 observations
Zebra Mussel
Dreissena polymorpha
105 observations
Eastern Floater
Pyganodon cataracta
99 observations
Toga Mantleslug
Philomycus togatus
98 observations
Quick Gloss Snail
Zonitoides arboreus
79 observations
Japanese Mystery Snail
Heterogen japonica
74 observations
Fatmucket
Lampsilis siliquoidea
67 observations
Marsh Ramshorn
Planorbella trivolvis
63 observations
Hedgehog Slug
Arion intermedius
62 observations
Giant Floater
Pyganodon grandis
61 observations
Pointed Campeloma
Campeloma decisum
55 observations
Wavyrayed Lampmussel
Lampsilis fasciola
54 observations
Glossy Pillar
Cochlicopa lubrica
52 observations
Quagga Mussel
Dreissena bugensis
50 observations
Three-ridge Mussel
Amblema plicata
49 observations
Pink Heelsplitter
Potamilus alatus
48 observations
Garden Arion
Arion hortensis
45 observations
Acute Bladder Snail
Physella acuta
41 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
40 observations
Black Sandshell
Ligumia recta
39 observations
Rainbow Mussel
Cambarunio iris
39 observations
Paper Pondshell
Utterbackia imbecillis
38 observations
Flamed Tigersnail
Anguispira alternata
36 observations
Black Gloss Snail
Zonitoides nitidus
35 observations
Flutedshell
Lasmigona costata
34 observations
Plain Pocketbook
Lampsilis cardium
32 observations
Yellow Lampmussel
Lampsilis cariosa
32 observations
Creeper
Strophitus undulatus
27 observations
Snuffbox
Epioblasma triquetra
23 observations
Alewife Floater
Utterbackiana implicata
23 observations
Round Pigtoe
Pleurobema sintoxia
21 observations
Frequently Asked Questions
- The 10 most common molluscs in Pennsylvania are:
- Leopard Slug (Limax maximus)
- Asian Clam (Corbicula fluminea)
- Eastern Elliptio (Elliptio complanata)
- Brown-lipped Snail (Cepaea nemoralis)
- Milky Slug (Deroceras reticulatum)
- Globose Dome Snail (Ventridens ligera)
- Changeable Mantleslug (Megapallifera mutabilis)
- Rounded Snail (Gonyodiscus rotundatus)
- Chinese Mystery Snail (Margarya chinensis)
- Mucket (Ortmanniana ligamentina)
- The most observed mollusc in Pennsylvania is Leopard Slug (Limax maximus), with 2,560 recorded observations.