(Described as Isthmia corpulenta) The shell is rimate perforate, elongate ovate, finely striated, polished, translucent, dark olive brown. The apex is round and obtuse. The shell contains four whorls, convex, tumid, wider at the base. The aperture is large, subcircular, with four obtuse teeth, one on the parietal margin, one on the columellar margin, and two on the outer lip. The peristome is slightly thickened and reflected.[2]
Distribution
This species is known to occur in a number of countries and islands including:
^"Vertigo modesta". Utah Division of Wildlife Resources. Archived from the original on December 29, 2016. Retrieved May 18, 2017.
Gould, A. A. (1847). [Description] of a new species of Physa, together with two other new species of North American shells. Proceedings of the Boston Society of Natural History. 2: 262–263.
Ancey, C. F. (1887). Description of North American shells. The Conchologists' Exchange. 2(6): 79–80.
Bank, R. A.; Neubert, E. (2017). Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16, 2017.
Sysoev, A. V. & Schileyko, A. A. (2009). Land snails and slugs of Russia and adjacent countries. Sofia/Moskva (Pensoft). 312 pp., 142 plates.
