Vertigo (Vertigo) antivertigo (DRAPARNAUD, 1801)

Shell: Dextrous, whorls 4-5, most often 4.5. Shape short to elongate ovate, spire tapered. Whorls most often moderately convex, suture moderately deep. Aperture distinctly heart-shaped, with a deep palatal incision. Teeth 6-11: columellar, fold-like; parietal and angular, both high, lamellate; upper and lower palatal; basal, knob-like, large; subcolumellar, knob-shaped; infraparietal, low, short, roll-like; supraangular, knob-shaped, very small; 1-2 suprapalatals, knob-shaped, small. Umbilicus shallow, closed. Surface sculpture of very weak and irregular, poorly visible striae. Shell shiny, semitransparent, uniformly reddish-brown of varying hue, teeth lighter.
Dimensions: Height 1.70-2.30 mm, breadth 1.20-1.40 mm, aperture height 0.45-0.65 mm, aperture breadth 0.63-0.88, body whorl height 1.10-1.35.
Ecology: A higrophile, found even in regularly flooded areas, inhabits marshes, open and alder fens, beds of sedge or reed on lake shores and river banks where it is common and abundant.
Distribution: A Eurosiberian species, inhabiting nearly entire Europe: in the south to Portugal, in the north of Scandinavia to 63°, in the west to Ireland. Its eastern range comprises a large area of Asia including the Transbaical lands, in the north of Asia it penetrates the tundra zone. The species appears to be common in all the studied regions of Poland, in the mountains reaching ca. 900 m a.sl.