British Vertigos » Family: Vertiginidae » Direction of coiling » Is the mouth lip thickened? » Truncatellina or Vertigo?
The black and white illustrations of shells are reproduced by kind permission of the publisher, Harley Books (B.H. & A. Harley Ltd.), from "Atlas of Land and Freshwater Molluscs of Britain and Ireland" by Dr. Michael Kerney, published in 1999.
Separating Truncatellina species from Vertigo species.
Shell minute and very narrow (0.9 mm. wide); almost cylindrical. (Truncatellina sp.) Click on the image to the left to continue.
Shell wider (1.0 - 1.5 mm. wide); ovoid. (Vertigo – dextral species) Click on the image to the right to continue.