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Asian Clam
Corbicula fluminea
716 observations
Giant Floater
Pyganodon grandis
532 observations
Leopard Slug
Limax maximus
489 observations
Plain Pocketbook
Lampsilis cardium
290 observations
Chinese Mystery Snail
Margarya chinensis
261 observations
Milky Slug
Deroceras reticulatum
204 observations
Mucket
Ortmanniana ligamentina
181 observations
Fatmucket
Lampsilis siliquoidea
173 observations
White Heelsplitter
Lasmigona complanata
172 observations
Pimpleback
Pustulosa pustulosa
161 observations
Three-ridge Mussel
Amblema plicata
156 observations
Fragile Papershell
Potamilus fragilis
148 observations
Zebra Mussel
Dreissena polymorpha
147 observations
Paper Pondshell
Utterbackia imbecillis
115 observations
Quagga Mussel
Dreissena bugensis
113 observations
Flamed Tigersnail
Anguispira alternata
113 observations
Wabash Pigtoe
Fusconaia flava
99 observations
Mapleleaf
Quadrula quadrula
98 observations
Pink Heelsplitter
Potamilus alatus
95 observations
Black Sandshell
Ligumia recta
85 observations
Lilliput
Toxolasma parvum
78 observations
Marsh Ramshorn
Planorbella trivolvis
74 observations
Brown-lipped Snail
Cepaea nemoralis
70 observations
Elktoe
Alasmidonta marginata
69 observations
Pistolgrip
Quadrula verrucosa
68 observations
Western Dusky Slug
Arion subfuscus
58 observations
Sharp Hornsnail
Pleurocera acuta
54 observations
Round Pigtoe
Pleurobema sintoxia
51 observations
Pink Papershell
Potamilus ohiensis
48 observations
Acute Bladder Snail
Physella acuta
48 observations
Spike
Eurynia dilatata
46 observations
Creeper
Strophitus undulatus
44 observations
Meadow Slug
Deroceras laeve
44 observations
Carthusian Nun Snail
Monacha cartusiana
43 observations
Changeable Mantleslug
Megapallifera mutabilis
43 observations
Carolina Mantleslug
Philomycus carolinianus
43 observations
Fawnsfoot
Truncilla donaciformis
42 observations
Marsh Pond Snail
Ladislavella elodes
42 observations
Flutedshell
Lasmigona costata
41 observations
Yellow Sandshell
Lampsilis teres
41 observations
Purple Wartyback
Cyclonaias tuberculata
40 observations
Striped Whitelip
Webbhelix multilineata
39 observations
Garden Arion
Arion hortensis
35 observations
White-lip Globe Snail
Mesodon thyroidus
34 observations
Deertoe Mussel
Truncilla truncata
34 observations
Cylindrical Papershell
Anodontoides ferussacianus
34 observations
Three-horn Wartyback
Obliquaria reflexa
32 observations
Ellipse
Venustaconcha ellipsiformis
31 observations
Glossy Pillar
Cochlicopa lubrica
31 observations
Lake Fingernailclam
Musculium lacustre
30 observations
Frequently Asked Questions
- The 10 most common molluscs in Illinois are:
- Asian Clam (Corbicula fluminea)
- Giant Floater (Pyganodon grandis)
- Leopard Slug (Limax maximus)
- Plain Pocketbook (Lampsilis cardium)
- Chinese Mystery Snail (Margarya chinensis)
- Milky Slug (Deroceras reticulatum)
- Mucket (Ortmanniana ligamentina)
- Fatmucket (Lampsilis siliquoidea)
- White Heelsplitter (Lasmigona complanata)
- Pimpleback (Pustulosa pustulosa)
- The most observed mollusc in Illinois is Asian Clam (Corbicula fluminea), with 716 recorded observations.