Omphalina laevigata perlaevis
perlaevis = left "latin"
Whorls more convex beneath than in typical Iaevigata, the last whorl much smoother above, not rib-striate, its width at the aperture (measured above) less than one-third the diameter of the shell. Aperture rounded-lunate, almost as high as wide. Alt. 9 1/2, diam. 17 mm. This is from Tallassee ford of the Little Tennessee river, Monroe county, Tenn.
Original Description Citation:
Pilsbry, H. A. (1900). Mollusca of the Great Smoky Mountains. Proceedings of the Academy of Natural Sciences of Philadelphia. 52: 110-150., available online at https://www.biodiversitylibrary.org/page/24693990
Nature Serve Conservation Status:
G4: Apparently Secure