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Leopard Slug
Limax maximus
2,329 observations
Asian Clam
Corbicula fluminea
1,098 observations
Brown-lipped Snail
Cepaea nemoralis
568 observations
Milky Slug
Deroceras reticulatum
534 observations
Eastern Elliptio
Elliptio complanata
395 observations
Globose Dome Snail
Ventridens ligera
359 observations
Chinese Mystery Snail
Margarya chinensis
279 observations
Rounded Snail
Gonyodiscus rotundatus
257 observations
Changeable Mantleslug
Megapallifera mutabilis
255 observations
Mucket
Ortmanniana ligamentina
247 observations
Western Dusky Slug
Arion subfuscus
190 observations
Spike
Eurynia dilatata
172 observations
Meadow Slug
Deroceras laeve
148 observations
Kidneyshell
Ptychobranchus fasciolaris
138 observations
Northern Riffleshell
Epioblasma rangiana
115 observations
Draparnaud's Glass Snail
Oxychilus draparnaudi
114 observations
Eastern Whitelip
Neohelix albolabris
113 observations
White-lip Globe Snail
Mesodon thyroidus
112 observations
Clubshell Pearly Mussel
Pleurobema clava
105 observations
Zebra Mussel
Dreissena polymorpha
105 observations
Eastern Floater
Pyganodon cataracta
98 observations
Winding Mantleslug
Philomycus flexuolaris
83 observations
Toga Mantleslug
Philomycus togatus
79 observations
Quick Gloss Snail
Zonitoides arboreus
79 observations
Fatmucket
Lampsilis siliquoidea
65 observations
Giant Floater
Pyganodon grandis
60 observations
Hedgehog Slug
Arion intermedius
55 observations
Pointed Campeloma
Campeloma decisum
54 observations
Marsh Ramshorn
Planorbella trivolvis
52 observations
Quagga Mussel
Dreissena bugensis
49 observations
Wavyrayed Lampmussel
Lampsilis fasciola
49 observations
Glossy Pillar
Cochlicopa lubrica
49 observations
Japanese Mystery Snail
Heterogen japonica
48 observations
Pink Heelsplitter
Potamilus alatus
47 observations
Three-ridge Mussel
Amblema plicata
47 observations
Acute Bladder Snail
Physella acuta
39 observations
Garden Arion
Arion hortensis
38 observations
Paper Pondshell
Utterbackia imbecillis
37 observations
Black Sandshell
Ligumia recta
36 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
36 observations
Black Gloss Snail
Zonitoides nitidus
35 observations
Flutedshell
Lasmigona costata
34 observations
Flamed Tigersnail
Anguispira alternata
33 observations
Plain Pocketbook
Lampsilis cardium
30 observations
Creeper
Strophitus undulatus
27 observations
Yellow Lampmussel
Lampsilis cariosa
26 observations
Oval Ambersnail
Novisuccinea ovalis
26 observations
Rainbow Mussel
Cambarunio iris
25 observations
Alewife Floater
Utterbackiana implicata
22 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)
- Brown-lipped Snail (Cepaea nemoralis)
- Milky Slug (Deroceras reticulatum)
- Eastern Elliptio (Elliptio complanata)
- Globose Dome Snail (Ventridens ligera)
- Chinese Mystery Snail (Margarya chinensis)
- Rounded Snail (Gonyodiscus rotundatus)
- Changeable Mantleslug (Megapallifera mutabilis)
- Mucket (Ortmanniana ligamentina)
- The most observed mollusc in Pennsylvania is Leopard Slug (Limax maximus), with 2,329 recorded observations.