Land Snails

Photo(s): Mesodon elevatus © Bill Frank, and views of its shell by Larry Watrous.
Illustration © Kathy Schmidt from her series "Land Snails of New York State."

Click photo(s) to enlarge.

Mesodon elevatus (Say, 1821)

Family: Polygyridae
Common name: Proud Globe

Identification
Width: 20-26 mm
Height: 14-20 mm tall
Whorls: 6+

The shell of Mesodon elevatus is among the tallest of the globe-shaped snails. The shell is sturdy and somewhat small compared to others in its genus. Its whorls are tightly coiled and the aperture may be flat or slightly concave at the basal lip. It has a pronounced tooth and a subtle lamella on the lower edge of the reflected lip (Pilsbry, 1940). The snail is light-colored.

Ecology
Mesodon elevatus is apparently a calciphile, and in Tennessee it was found in small numbers on moderately-sloping, limestone sites, at low elevations (Coney et al, 1982). It may also be found on river bluffs (Hubricht, 1985).

Taxonomy
Mesodon elevatus has also been known as: Helix elevata, H. knoxvillina, H. tennesseensis, Mesodon elevata, Polygyra elevata, and P. elevatus.

Distribution
This snail is a Midwestern native, ranging from Michigan and New York (where it is introduced) in the north, south to Alabama, west to Oklahoma and east to Virginia and North Carolina. In Virginia this species lives in the southwestern counties. Several scattered museum records are in need of verification.

Conservation
NatureServe Global Rank: G5, Secure
NatureServe State Rank: Virginia, S2, Imperiled; not ranked in other Northeastern states
Virginia’s wildlife action plan: Tier IV

 

Ken Hotopp, Meegan Winslow 9/2012

Range Map (click to enlarge)