Perpolita hammonis has a light brown shell with about 3.5 whorls. The shell is shiny with characteristic regular, radial lines. These help as well to distinguish young N. hammonis from other young snails of the families Oxychilidae and Gastrodontidae.[4]
The 1.9-2.1 x 3.6-4.1 mm (0.075-0.083 x 0.142-0.161 in) shell has 3-3.5 whorls. These are usually reddish brown, with regular radial riblets (9-14 riblets per mm, 7-11 riblets per 1⁄32 in). The umbilicus is open and not deep, and slightly excentric at the last whorl. Fresh shells have very faintly visible spiral lines under high magnification, about 10 spiral lines per radial riblet, 100-150 lines/mm (80-120 lines per 1⁄32 in). The animal is slender and blackish. The tentacles are black. The foot is narrow, and grey in colour with blackish upper sides and black spots on the sides. The mantle is light grey.[5]
Habitat
The species can live in a wide range of habitats with dry to humid conditions. It can as well tolerate acidic soils.[4]Nesiovitrea hammonis can live in open sites, like meadows, but it generally occurs in wooded habitats and is often found in beech forests.[6]
References
^Strøm H. (1765). "Beskrivelse over Norske insecter, første stykke". Det Trondhiemske Selskabs Skrifter3: 376-439, Tab. VI., page 435, Tab. VI, Fig. XVI.
^Welter-Schultes, F.W. 2012. European non-marine molluscs, a guide for species identification: Bestimmungsbuch für europäische Land- und Süsswassermollusken. Planet Poster Editions: Göttingen.
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
