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Leopard Slug
Limax maximus
2,668 observations
Asian Clam
Corbicula fluminea
1,142 observations
Eastern Elliptio
Elliptio complanata
878 observations
Brown-lipped Snail
Cepaea nemoralis
670 observations
Milky Slug
Deroceras reticulatum
582 observations
Globose Dome Snail
Ventridens ligera
361 observations
Changeable Mantleslug
Megapallifera mutabilis
301 observations
Rounded Snail
Gonyodiscus rotundatus
285 observations
Chinese Mystery Snail
Margarya chinensis
281 observations
Mucket
Ortmanniana ligamentina
250 observations
Western Dusky Slug
Arion subfuscus
210 observations
Spike
Eurynia dilatata
181 observations
Meadow Slug
Deroceras laeve
157 observations
Kidneyshell
Ptychobranchus fasciolaris
152 observations
Eastern Whitelip
Neohelix albolabris
130 observations
Winding Mantleslug
Philomycus flexuolaris
124 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
117 observations
Toga Mantleslug
Philomycus togatus
108 observations
Zebra Mussel
Dreissena polymorpha
107 observations
Eastern Floater
Pyganodon cataracta
99 observations
Quick Gloss Snail
Zonitoides arboreus
77 observations
Japanese Mystery Snail
Heterogen japonica
75 observations
Fatmucket
Lampsilis siliquoidea
69 observations
Marsh Ramshorn
Planorbella trivolvis
67 observations
Hedgehog Slug
Arion intermedius
65 observations
Giant Floater
Pyganodon grandis
62 observations
Wavyrayed Lampmussel
Lampsilis fasciola
55 observations
Pointed Campeloma
Campeloma decisum
55 observations
Glossy Pillar
Cochlicopa lubrica
54 observations
Three-ridge Mussel
Amblema plicata
50 observations
Quagga Mussel
Dreissena bugensis
50 observations
Pink Heelsplitter
Potamilus alatus
48 observations
Garden Arion
Arion hortensis
46 observations
Acute Bladder Snail
Physella acuta
42 observations
Rainbow Mussel
Cambarunio iris
41 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
40 observations
Black Sandshell
Ligumia recta
39 observations
Black Gloss Snail
Zonitoides nitidus
39 observations
Paper Pondshell
Utterbackia imbecillis
38 observations
Flutedshell
Lasmigona costata
36 observations
Flamed Tigersnail
Anguispira alternata
36 observations
Yellow Lampmussel
Lampsilis cariosa
34 observations
Plain Pocketbook
Lampsilis cardium
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 2,668 recorded observations.