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Asian Clam
Corbicula fluminea
681 observations
Giant Floater
Pyganodon grandis
489 observations
Leopard Slug
Limax maximus
453 observations
Chinese Mystery Snail
Margarya chinensis
266 observations
Plain Pocketbook
Lampsilis cardium
243 observations
Milky Slug
Deroceras reticulatum
196 observations
Mucket
Ortmanniana ligamentina
158 observations
Fatmucket
Lampsilis siliquoidea
154 observations
Zebra Mussel
Dreissena polymorpha
145 observations
White Heelsplitter
Lasmigona complanata
145 observations
Pimpleback
Pustulosa pustulosa
139 observations
Three-ridge Mussel
Amblema plicata
127 observations
Fragile Papershell
Potamilus fragilis
126 observations
Quagga Mussel
Dreissena bugensis
112 observations
Paper Pondshell
Utterbackia imbecillis
107 observations
Flamed Tigersnail
Anguispira alternata
88 observations
Mapleleaf
Quadrula quadrula
87 observations
Wabash Pigtoe
Fusconaia flava
83 observations
Pink Heelsplitter
Potamilus alatus
82 observations
Black Sandshell
Ligumia recta
77 observations
Marsh Ramshorn
Planorbella trivolvis
71 observations
Lilliput
Toxolasma parvum
71 observations
Elktoe
Alasmidonta marginata
56 observations
Pistolgrip
Quadrula verrucosa
55 observations
Brown-lipped Snail
Cepaea nemoralis
52 observations
Western Dusky Slug
Arion subfuscus
50 observations
Round Pigtoe
Pleurobema sintoxia
48 observations
Acute Bladder Snail
Physella acuta
48 observations
Carthusian Nun Snail
Monacha cartusiana
41 observations
Pink Papershell
Potamilus ohiensis
41 observations
Meadow Slug
Deroceras laeve
41 observations
Spike
Eurynia dilatata
40 observations
Fawnsfoot
Truncilla donaciformis
39 observations
Creeper
Strophitus undulatus
39 observations
Changeable Mantleslug
Megapallifera mutabilis
38 observations
Carolina Mantleslug
Philomycus carolinianus
38 observations
Purple Wartyback
Cyclonaias tuberculata
36 observations
Flutedshell
Lasmigona costata
36 observations
Yellow Sandshell
Lampsilis teres
36 observations
Garden Arion
Arion hortensis
33 observations
Striped Whitelip
Webbhelix multilineata
33 observations
White-lip Globe Snail
Mesodon thyroidus
31 observations
Sharp Hornsnail
Pleurocera acuta
31 observations
Deertoe Mussel
Truncilla truncata
30 observations
Lake Fingernailclam
Musculium lacustre
30 observations
Marsh Pond Snail
Ladislavella elodes
29 observations
Swamp Fingernailclam
Musculium partumeium
28 observations
Ellipse
Venustaconcha ellipsiformis
27 observations
Three-horn Wartyback
Obliquaria reflexa
26 observations
Cylindrical Papershell
Anodontoides ferussacianus
26 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)
- Zebra Mussel (Dreissena polymorpha)
- White Heelsplitter (Lasmigona complanata)
- The most observed mollusc in Illinois is Asian Clam (Corbicula fluminea), with 681 recorded observations.
- Some of the most commonly observed native molluscs in Illinois include:
- Swamp Fingernailclam (Musculium partumeium)