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Garden Snail
Cornu aspersum
293 observations
Milky Slug
Deroceras reticulatum
174 observations
Asian Clam
Corbicula fluminea
158 observations
Leopard Slug
Limax maximus
82 observations
Giant Floater
Pyganodon grandis
81 observations
Brown-lipped Snail
Cepaea nemoralis
43 observations
Rocky Mountainsnail
Oreohelix strigosa
36 observations
Invasive
Draparnaud's Glass Snail
Oxychilus draparnaudi
36 observations
Glossy Pillar
Cochlicopa lubrica
32 observations
Marsh Ramshorn
Planorbella trivolvis
21 observations
Costate Vallonia
Vallonia costata
17 observations
Pellucid Glass-snail
Vitrina pellucida
17 observations
Acute Bladder Snail
Physella acuta
14 observations
Invasive
New Zealand Mudsnail
Potamopyrgus antipodarum
12 observations
Lovely Vallonia
Vallonia pulchella
10 observations
Meadow Slug
Deroceras laeve
7 observations
Black Slug
Arion ater
5 observations
Striated Fingernailclam
Sphaerium striatinum
5 observations
Paper Pondshell
Utterbackia imbecillis
4 observations
Asian Tramp Snail
Bradybaena similaris
3 observations
Black Gloss Snail
Zonitoides nitidus
3 observations
Invasive
Big-eared Radix
Radix auricularia
2 observations
Southern Flatcoil
Polygyra cereolus
1 observations
Ash Gyro
Gyraulus parvus
1 observations
Invasive
Orange-banded Arion
Arion fasciatus
1 observations
Greenhouse Slug
Milax gagates
1 observations
Pallid Mountainsnail
Oreohelix hendersoni
1 observations
Subalpine Mountainsnail
Oreohelix subrudis
1 observations
White-lip Dagger
Pupoides albilabris
1 observations
Dusky Slugs
Mesarion
1 observations
hortensis-group Arion Slugs
Kobeltia
1 observations
Invasive
Purple-Nacre Clam
Corbicula largillierti
1 observations
Striped Garden Slug
Ambigolimax parvipenis
1 observations
Ridgedbeak Peaclam
Euglesa compressa
1 observations
Frequently Asked Questions
- The 10 most common molluscs in Colorado are:
- Garden Snail (Cornu aspersum)
- Milky Slug (Deroceras reticulatum)
- Asian Clam (Corbicula fluminea)
- Leopard Slug (Limax maximus)
- Giant Floater (Pyganodon grandis)
- Brown-lipped Snail (Cepaea nemoralis)
- Rocky Mountainsnail (Oreohelix strigosa)
- Draparnaud's Glass Snail (Oxychilus draparnaudi)
- Glossy Pillar (Cochlicopa lubrica)
- Marsh Ramshorn (Planorbella trivolvis)
- The most observed mollusc in Colorado is Garden Snail (Cornu aspersum), with 293 recorded observations.
- Some of the most commonly observed invasive molluscs in Colorado include:
- Draparnaud's Glass Snail (Oxychilus draparnaudi)
- New Zealand Mudsnail (Potamopyrgus antipodarum)
- Big-eared Radix (Radix auricularia)
- Orange-banded Arion (Arion fasciatus)
- Purple-Nacre Clam (Corbicula largillierti)