Vertigo moulinsiana and V. modesta
Vertigo moulinsiana (Dupuy, 1849)
Description: Shell broadly oval; the body whorl accounts for nearly two-thirds of the total height; aperture relatively large and triangular with an indented outer margin; 4 - 5 well-defined apertural teeth, 1 parietal, 1 columella, and 2 palatal, the palatals linked by a callus.Shell yellowish- or reddish-brown, glossy and tranlucent.
Habitat: Calcareous fens and marshes; often on Phragmites at the edges of lowland rivers and lakes.
Vertigo modesta (Say, 1824) (Syn: V. arctica)
Description: Shell more cylindrical; aperture relatively smaller and rounded. 3 - 4 very small deeply-set apertural teeth, 1 parietal, 1 columellar, 1 lower palatal (sometimes absent, and sometimes an additional upper palatal). Mouth edge simple and scarcely thickened. Shell pale yellowish-brown, translucent, not glossy, but with a silky sheen due to many reguler fine growth lines.
Habitat: Damp shaded places in calcareous mountain areas.