Zebrina detrita Muller, 1774
Common names: Large Bulin, Zebra Snail [En], Bulime zébré [Fr], Märzenschnecke [De]
Uzundere, ERZURUM ● Turkey
Description: The shell is widely oval with a blunt tip, almost smooth and shining. The shell with its firm wall is opaquely white, hint towards the fact that this is a warmth-loving species. There are dark stripes running across the whorls, giving the snail its zebra-like appearance. But those stripes can also be missing so the snail is purely white. The aperture is light brownish, umbilicus open and partly covered.
The size is 12-30 x 8-12 mm, the egg diameter 2.0-2.4 mm.
At the periphery of the range of this species in central Albania, isolated from the main populations, Fehér & Erőss 2009 found a consistently sinistral population and classified it as a new subspecies Z. detrita sallake.
Biology: The snail is described as sociable, it does appear in large numbers. In central Europe, the animals hibernate in 3-5 cm depth in the soil. In the summer the animals escape bottom heat by climbing up grasses.
The reproduction (in Germany) occurs in two periods April/May and August/September. The copulation only at rainy days takes about 1 hour in which both partners exchange spermatophores. Snails can copulate various times. 10-20 days after copulation, the eggs (2.0-2.4 mm) are laid in clutches of 15-70 eggs. Juveniles hatch after 27-36 days, the full size is reached after 2 years. The maximum age is 4-5 years.
Habitat: Meadows of warm and dry slopes, rocky grasslands. In Switzerland in up to 1800 m, in Bulgaria 2500 m.
Distribution: From NE Spain to Germany, W Ukraine and Turkey
Threats : The species is threatened by agricultural activities, especially by cutting of grasses in the summer season. It is endangered in Austria, Czech Republic and Germany, vulnerable in Switzerland.
The living world of Molluscs