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Asian Clam
Corbicula fluminea
691 observations
Giant Floater
Pyganodon grandis
514 observations
Leopard Slug
Limax maximus
479 observations
Plain Pocketbook
Lampsilis cardium
265 observations
Chinese Mystery Snail
Margarya chinensis
262 observations
Milky Slug
Deroceras reticulatum
201 observations
Mucket
Ortmanniana ligamentina
162 observations
Fatmucket
Lampsilis siliquoidea
161 observations
White Heelsplitter
Lasmigona complanata
159 observations
Pimpleback
Pustulosa pustulosa
156 observations
Three-ridge Mussel
Amblema plicata
148 observations
Zebra Mussel
Dreissena polymorpha
147 observations
Fragile Papershell
Potamilus fragilis
135 observations
Quagga Mussel
Dreissena bugensis
112 observations
Paper Pondshell
Utterbackia imbecillis
110 observations
Flamed Tigersnail
Anguispira alternata
102 observations
Mapleleaf
Quadrula quadrula
95 observations
Pink Heelsplitter
Potamilus alatus
91 observations
Wabash Pigtoe
Fusconaia flava
90 observations
Black Sandshell
Ligumia recta
82 observations
Lilliput
Toxolasma parvum
76 observations
Marsh Ramshorn
Planorbella trivolvis
73 observations
Brown-lipped Snail
Cepaea nemoralis
65 observations
Pistolgrip
Quadrula verrucosa
64 observations
Elktoe
Alasmidonta marginata
60 observations
Western Dusky Slug
Arion subfuscus
56 observations
Round Pigtoe
Pleurobema sintoxia
51 observations
Acute Bladder Snail
Physella acuta
48 observations
Sharp Hornsnail
Pleurocera acuta
45 observations
Pink Papershell
Potamilus ohiensis
44 observations
Meadow Slug
Deroceras laeve
44 observations
Carthusian Nun Snail
Monacha cartusiana
43 observations
Spike
Eurynia dilatata
43 observations
Creeper
Strophitus undulatus
42 observations
Carolina Mantleslug
Philomycus carolinianus
42 observations
Marsh Pond Snail
Ladislavella elodes
42 observations
Fawnsfoot
Truncilla donaciformis
41 observations
Changeable Mantleslug
Megapallifera mutabilis
41 observations
Purple Wartyback
Cyclonaias tuberculata
40 observations
Yellow Sandshell
Lampsilis teres
39 observations
Flutedshell
Lasmigona costata
37 observations
Striped Whitelip
Webbhelix multilineata
36 observations
Garden Arion
Arion hortensis
34 observations
White-lip Globe Snail
Mesodon thyroidus
33 observations
Cylindrical Papershell
Anodontoides ferussacianus
32 observations
Three-horn Wartyback
Obliquaria reflexa
31 observations
Deertoe Mussel
Truncilla truncata
31 observations
Ellipse
Venustaconcha ellipsiformis
30 observations
Lake Fingernailclam
Musculium lacustre
30 observations
Swamp Fingernailclam
Musculium partumeium
28 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 691 recorded observations.
- Some of the most commonly observed native molluscs in Illinois include:
- Swamp Fingernailclam (Musculium partumeium)