Oxychilus - Glass-snails (Family Oxychilidae) 

Three species are in the databases: the Cellar Glass-snail Oxychilus cellarius, the Dark-bodied Glass-snail Oxychilus draparnaudi, and the Garlic Glass-snail Oxychilus alliarius. All are European species introduced into the US.

Characters and Comparison:  These species are uncommon in the state. They are heliciform, simple lip, subglobose to depressed, and narrowly umbilicate, They may be confused with smaller Mesomphix

The Cellar Glass-snail runs 9-14 mm in diameter and the animal is blue-gray in color. The Dark-bodied Glass-snail runs 12-17 mm in diameter and dark blue in color.  Hotopp et al. 2013 suggest that the shell of Oxychilus cellarius is also more opaque and relatively flatter than O. cellarius. The Garlic Glass-snail is smaller (maybe 5-8 mm in diameter), the body is dark blue-gray, and it releases a garlic smell when irritated (NatureSpot). 

For more information and images on the first two species, see Dourson (2015) or Hotopp et al. 2013.

Habitat: These western European species tend to be found in degraded urban habitats (Dourson 2010, 2015) including yards and gardens. They may be transported in the landscaping plant trade (Bergey et al. 2014). The Dark-bodied Glass-snail Oxychilus draparnaudi is an omnivore and has been observed preying on native land snails (Hotopp et al. 2013).

Status: may be more common that the maps indicate.

Cellar Glass-snail
Oxychilus cellarius (Muller, 1774)

Dark-bodied Glass-snail
Oxychilus draparnaudi (Beck, 1837)  

Garlic Glass-snail
Oxychilus allarius (J.S. Miller, 1822)