Virginia Land Snails
Photo(s): Shells of Triodopsis vulgata by Bill Frank (1) ©, and Larry Watrous (3) ©.
Click photo(s) to enlarge.
Triodopsis vulgata Pilsbry, 1940
Common name: Dished Threetooth
Width: 13.5-15 mm
Height: 7-10 mm
One of many variations on the three-tooth theme, Triodopsis vulgata’s shell has a recessed outer (palatal) tooth. It has a heavy parietal tooth that is smaller than occurs in T. fraudulenta, a peg-like basal tooth, and the usual sculpture of tiny radial ridges over its shell. The umbilicus is open.
Triodopsis vulgata prefers mature or late-successional, mesic forests, inhabiting ravines and wooded hillsides (Hubricht, 1985). In Tennessee it can be found on very steep slopes in leaf litter and woody debris (Coney et al, 1982).
Synonyms for this species are Helix tridentata, H. fallax, Polygyra fraudulenta, Triodopsis fallax, and T. fraudulenta vulgata.
From southern Michigan, southeastern Canada and New York in the north, T. vulgata’s range extends south in the Appalachians to Alabama, and west to Mississippi and Illinois (Pilsbry, 1940; Hubricht, 1985). In Virginia it is found mainly in the western counties.
NatureServe Global Rank: G5
NatureServe State Rank: S3S4
Ken Hotopp, Meegan Winslow 11/2012Range Map