Vertigo lilljeborgi
Moor 's whorl snail ( Vertigo lilljeborgi )
The Moor 's whorl snail ( Vertigo lilljeborgi ), also called Moor - whorl snail is a snail of the family of the diaper snails ( Vertiginidae ) from the subordination of terrestrial snails ( gastropod ).
- 5.1 Literature
- 5.2 Notes and references
Features
The right-handed, egg-shaped housing is 1.7 to 2.05 mm high and 1.15 -1.35mm wide. It has 4 to 5 strongly curved, rapidly increasing turns with a deep seam. The last turn is relatively very large and bulbous; it rises towards the mouth only slightly. The aperture rim is hardly thickened, rather sharply tapered and very little extended. The ornamentation consists of weak, but regular growth lines. The mouth is pear-shaped to heart-shaped wrong in the frontal view. It is usually armed with four well-trained, slender teeth: a parietal tooth, a tooth columellarer and two palatal teeth. The teeth sit directly on the inner orifice wall. The neck ridge is poorly developed.
The body is yellowish brown to brown, smooth and shiny. The skin is thin and fragile.
Similar Species
The species is very similar in external habit of the bulbous whorl snail ( Vertigo moulinsiana ). However, it is significantly smaller than this. However, it differs in the genital apparatus. The congregation 's whorl snail ( Vertigo pygmaea ), although similar in size to the Moor 's whorl snail, but clearly schlänker. All three species show a similar reinforcement of the estuary. In the Commons whorl snail and the bulbous whorl snail teeth at the base are connected by a callus.
Geographical distribution and habitat
The distribution area extends from Ireland, Northern England and Scotland over Scandinavia, the Baltic States (Latvia ) to North West Russia. But there are still some isolated populations in Wales, Denmark, Germany (eg the Black Forest, Bavarian Forest, etc.), the Czech Republic, France (Auvergne ) and the French and Spanish Pyrenees. Recently, was discovered in the Altai.
The animals live in open swamps, alder swamps, on pond and stream edges, often in the flood area in moist, decaying plant debris. They prefer mineral- poor, acidic soils more.
Taxonomy
The taxon was described in 1871 by Carl Agardh Westerlund as Pupa lilljeborgi first time.
Endangering
In Germany the species is extremely rare ( hazard category R). In other European countries the species is partially highly vulnerable to drainage and water construction. In England and Ireland as some populations have been destroyed in recent decades. In Ireland, it is classified as "vulnerable " ( "endangered" ) classified. The International Union for Conservation of Nature and Natural Resources ( IUCN) assessed the level of risk overall, with only " Near Threatened " ( Near Threatened ).