Trochulus biconicus

The Nidwaldner hair worm ( biconicus Trochulus, formerly Trichia biconica ) is a species of snail from the family of deciduous snails.

Features

The housing is screw -shaped, and has a diameter of five to six millimeters and a thickness of 2.5 to 3.5 millimeters. The shell is pale brown.

Geographical occurrence, habitat and behavior

The distribution area of the screw is very limited, it is mainly used in a very small area around the Bannalp (municipality wolf shooting in the canton of Nidwalden ) and Engelberg ( Obwalden ) and partly above the Lake of Uri ago. Specifically, in 2007 populations were found in the following mountains:

• In the canton of Obwalden: on Ruchstock, on a slope Horn, on Huet floor, on the north side of Widderfeld Stocks and on Barglen
• In the canton of Nidwalden: on Schwalmis, on large whales floor, on Laucherenstock, on the north side of the breeze area, above the Münggenstöckli, on the rail mountains, on Laucherengrat, on the rabbit sticks and between the young and chli Sättelistock
• In the Canton of Uri: Uri at Rostock, at chli streaks on Wissberg, on Surenenpass, on the Hoh breezes and the wild Alpeli

The screw can only at an altitude of 2,000 to 2,570 m above sea level. M. survive. Because of the temperature rise due to climate change differs from the Nidwaldner hair worm to higher areas. However, in the area of ​​distribution the peaks are usually only about 300 meters higher, so that the evasive maneuver will end soon. There are no Nidwaldner hair worm be found at the lowermost localities from the 1980s. In the event that the habitat of the hair worm will continue to move up, there are considerations to relocate the animals or to bring some specimens in a zoo.

The land snail lives most of the time hidden under flat stones, especially in static limestone debris, on a slope or hillside edges of crests, ridge and peak positions as well as heads rock and rock stairs.

Synonymy and nomenclature

Was first described in the Nidwaldner hair worm by Leo Eder on Bannalp. After each finds in the years 2004 to 2006, the Nidwaldner biologist Markus Baggenstos has captured the areas of distribution and population density of the snail in a project in 2007.