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Asian Clam
Corbicula fluminea
682 observations
Giant Floater
Pyganodon grandis
495 observations
Leopard Slug
Limax maximus
454 observations
Chinese Mystery Snail
Margarya chinensis
266 observations
Plain Pocketbook
Lampsilis cardium
246 observations
Milky Slug
Deroceras reticulatum
198 observations
Mucket
Ortmanniana ligamentina
161 observations
Fatmucket
Lampsilis siliquoidea
156 observations
Pimpleback
Pustulosa pustulosa
148 observations
White Heelsplitter
Lasmigona complanata
147 observations
Zebra Mussel
Dreissena polymorpha
146 observations
Three-ridge Mussel
Amblema plicata
135 observations
Fragile Papershell
Potamilus fragilis
129 observations
Quagga Mussel
Dreissena bugensis
112 observations
Paper Pondshell
Utterbackia imbecillis
109 observations
Mapleleaf
Quadrula quadrula
93 observations
Flamed Tigersnail
Anguispira alternata
91 observations
Pink Heelsplitter
Potamilus alatus
86 observations
Wabash Pigtoe
Fusconaia flava
86 observations
Black Sandshell
Ligumia recta
77 observations
Lilliput
Toxolasma parvum
73 observations
Marsh Ramshorn
Planorbella trivolvis
72 observations
Pistolgrip
Quadrula verrucosa
58 observations
Elktoe
Alasmidonta marginata
57 observations
Brown-lipped Snail
Cepaea nemoralis
53 observations
Western Dusky Slug
Arion subfuscus
51 observations
Round Pigtoe
Pleurobema sintoxia
48 observations
Acute Bladder Snail
Physella acuta
48 observations
Pink Papershell
Potamilus ohiensis
42 observations
Meadow Slug
Deroceras laeve
42 observations
Carthusian Nun Snail
Monacha cartusiana
41 observations
Carolina Mantleslug
Philomycus carolinianus
41 observations
Changeable Mantleslug
Megapallifera mutabilis
40 observations
Spike
Eurynia dilatata
40 observations
Fawnsfoot
Truncilla donaciformis
39 observations
Creeper
Strophitus undulatus
39 observations
Marsh Pond Snail
Ladislavella elodes
39 observations
Purple Wartyback
Cyclonaias tuberculata
37 observations
Yellow Sandshell
Lampsilis teres
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
Sharp Hornsnail
Pleurocera acuta
33 observations
Deertoe Mussel
Truncilla truncata
31 observations
Lake Fingernailclam
Musculium lacustre
30 observations
Swamp Fingernailclam
Musculium partumeium
28 observations
Ellipse
Venustaconcha ellipsiformis
28 observations
Three-horn Wartyback
Obliquaria reflexa
27 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)
- Pimpleback (Pustulosa pustulosa)
- White Heelsplitter (Lasmigona complanata)
- The most observed mollusc in Illinois is Asian Clam (Corbicula fluminea), with 682 recorded observations.
- Some of the most commonly observed native molluscs in Illinois include:
- Swamp Fingernailclam (Musculium partumeium)