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Asian Clam
Corbicula fluminea
688 observations
Giant Floater
Pyganodon grandis
503 observations
Leopard Slug
Limax maximus
466 observations
Chinese Mystery Snail
Margarya chinensis
263 observations
Plain Pocketbook
Lampsilis cardium
253 observations
Milky Slug
Deroceras reticulatum
199 observations
Mucket
Ortmanniana ligamentina
161 observations
Fatmucket
Lampsilis siliquoidea
158 observations
White Heelsplitter
Lasmigona complanata
152 observations
Pimpleback
Pustulosa pustulosa
150 observations
Zebra Mussel
Dreissena polymorpha
146 observations
Three-ridge Mussel
Amblema plicata
139 observations
Fragile Papershell
Potamilus fragilis
130 observations
Quagga Mussel
Dreissena bugensis
112 observations
Paper Pondshell
Utterbackia imbecillis
109 observations
Mapleleaf
Quadrula quadrula
94 observations
Flamed Tigersnail
Anguispira alternata
92 observations
Pink Heelsplitter
Potamilus alatus
88 observations
Wabash Pigtoe
Fusconaia flava
87 observations
Black Sandshell
Ligumia recta
78 observations
Lilliput
Toxolasma parvum
75 observations
Marsh Ramshorn
Planorbella trivolvis
73 observations
Brown-lipped Snail
Cepaea nemoralis
62 observations
Pistolgrip
Quadrula verrucosa
61 observations
Elktoe
Alasmidonta marginata
57 observations
Western Dusky Slug
Arion subfuscus
56 observations
Round Pigtoe
Pleurobema sintoxia
49 observations
Acute Bladder Snail
Physella acuta
48 observations
Pink Papershell
Potamilus ohiensis
44 observations
Carthusian Nun Snail
Monacha cartusiana
43 observations
Meadow Slug
Deroceras laeve
43 observations
Spike
Eurynia dilatata
41 observations
Fawnsfoot
Truncilla donaciformis
40 observations
Changeable Mantleslug
Megapallifera mutabilis
40 observations
Creeper
Strophitus undulatus
39 observations
Yellow Sandshell
Lampsilis teres
39 observations
Carolina Mantleslug
Philomycus carolinianus
39 observations
Marsh Pond Snail
Ladislavella elodes
39 observations
Sharp Hornsnail
Pleurocera acuta
38 observations
Purple Wartyback
Cyclonaias tuberculata
37 observations
Flutedshell
Lasmigona costata
36 observations
Striped Whitelip
Webbhelix multilineata
36 observations
White-lip Globe Snail
Mesodon thyroidus
33 observations
Garden Arion
Arion hortensis
33 observations
Deertoe Mussel
Truncilla truncata
31 observations
Lake Fingernailclam
Musculium lacustre
30 observations
Ellipse
Venustaconcha ellipsiformis
29 observations
Swamp Fingernailclam
Musculium partumeium
28 observations
Three-horn Wartyback
Obliquaria reflexa
28 observations
Cylindrical Papershell
Anodontoides ferussacianus
27 observations
Frequently Asked Questions
- The 10 most common molluscs in Illinois are:
- Asian Clam (Corbicula fluminea)
- Giant Floater (Pyganodon grandis)
- Leopard Slug (Limax maximus)
- Chinese Mystery Snail (Margarya chinensis)
- Plain Pocketbook (Lampsilis cardium)
- 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 688 recorded observations.
- Some of the most commonly observed native molluscs in Illinois include:
- Swamp Fingernailclam (Musculium partumeium)