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Invasive
Eastern Heath Snail
Xerolenta obvia
128 observations
Leopard Slug
Limax maximus
104 observations
Milky Slug
Deroceras reticulatum
50 observations
Black Slug
Arion ater
41 observations
Idaho Forestsnail
Allogona ptychophora
22 observations
Fatmucket
Lampsilis siliquoidea
20 observations
Lymnaea jugularis
Lymnaea jugularis
17 observations
Western Pearlshell
Margaritifera falcata
16 observations
Grooved Fingernailclam
Sphaerium simile
15 observations
Giant Floater
Pyganodon grandis
13 observations
Western Banded Tigersnail
Anguispira occidentalis
12 observations
Western Dusky Slug
Arion subfuscus
9 observations
Rocky Mountainsnail
Oreohelix strigosa
7 observations
Invasive
Roman Snail
Helix pomatia
6 observations
Pacific Sideband
Monadenia fidelis
5 observations
Black Sandshell
Ligumia recta
5 observations
Acute Bladder Snail
Physella acuta
5 observations
Reticulate Taildropper
Prophysaon andersonii
5 observations
Mud Bithynia
Bithynia tentaculata
3 observations
Meadow Slug
Deroceras laeve
3 observations
Coeur d'Alene Oregonian
Cryptomastix mullani
3 observations
Mapleleaf
Quadrula quadrula
2 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
2 observations
Marsh Ramshorn
Planorbella trivolvis
2 observations
Red-rimmed Melania
Melanoides tuberculata
2 observations
Pellucid Glass-snail
Vitrina pellucida
2 observations
Marsh Pond Snail
Ladislavella elodes
2 observations
Chinese Mystery Snail
Margarya chinensis
2 observations
Asian Clam
Corbicula fluminea
1 observations
Rocky Mountain Capshell
Acroloxus coloradensis
1 observations
Big-eared Radix
Radix auricularia
1 observations
pond fingernailclam
Musculium securis
1 observations
White Heelsplitter
Lasmigona complanata
1 observations
Forest Disc
Discus whitneyi
1 observations
Robust Lancetooth Snail
Haplotrema vancouverense
1 observations
Magnum Mantleslug
Magnipelta mycophaga
1 observations
Alpine Mountainsnail
Oreohelix alpina
1 observations
Carinate Mountainsnail
Oreohelix elrodi
1 observations
Smoky Taildropper
Prophysaon humile
1 observations
Rhomboid Fingernailclam
Sphaerium rhomboideum
1 observations
Striated Fingernailclam
Sphaerium striatinum
1 observations
Black Gloss Snail
Zonitoides nitidus
1 observations
fasciatus-group Arion Slugs
Carinarion
1 observations
Frequently Asked Questions
- The 10 most common molluscs in Montana are:
- Eastern Heath Snail (Xerolenta obvia)
- Leopard Slug (Limax maximus)
- Milky Slug (Deroceras reticulatum)
- Black Slug (Arion ater)
- Idaho Forestsnail (Allogona ptychophora)
- Fatmucket (Lampsilis siliquoidea)
- Lymnaea jugularis
- Western Pearlshell (Margaritifera falcata)
- Grooved Fingernailclam (Sphaerium simile)
- Giant Floater (Pyganodon grandis)
- The most observed mollusc in Montana is Eastern Heath Snail (Xerolenta obvia), with 128 recorded observations.
- Some of the most commonly observed invasive molluscs in Montana include:
- Eastern Heath Snail (Xerolenta obvia)
- Roman Snail (Helix pomatia)