Belt screw

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Belt screw
Belt snail (Helicodonta obvoluta)

Belt snail ( Helicodonta obvoluta )

Systematics
Order : Lung snails (pulmonata)
Subordination : Land snails (Stylommatophora)
Superfamily : Helicoidea
Family : Belt snails (Helicodontidae)
Genre : Helicodonta
Type : Belt screw
Scientific name
Helicodonta obvoluta
( OV Müller , 1774)

The belt snail ( Helicodonta obvoluta ) is a type of snail of the family of the belt snail (Helicodontidae) from the suborder of the land snail (Stylommatophora). It is the only type of family that is native to Central Europe.

features

The housings are thick disk-shaped with five to six evenly increasing turns. Only the last half turn descends from the turn axis of the previous turns. The adult diameter is 11 to 15 mm with a height of 5 to 7 mm. The mouth is turned over in the area of ​​the outer and lower edge and z. T. thickened tooth-like. As a result, the mouth edge is divided into three shallow bays. The navel is wide and open. The reddish brown housing is wrinkled and striped and covered with hair about 1 mm long. The soft body is black-brown with a lighter sole. The antennae are relatively long, the foot relatively narrow.

Occurrence, way of life and distribution

The belt snail lives in forests under leaves, fallen wood as well as under and between stones. In some places it also occurs in rows of hedges, swamp forests and on springy slopes. The animals probably live on withered and fresh leaves, possibly also on mushroom mycelia. The distribution area extends from the Pyrenees, across southern and central France to Belgium, the German low mountain ranges to the western Carpathians. In the south, the distribution area extends to Tuscany and the northwestern Balkans. Small occurrences in the south-east of England (Kent) and in Schleswig-Holstein are interpreted as relict occurrences of the post-glacial warm period.

Systematics

The species was first described in 1774 by Otto Friedrich Müller under the name Helix obvoluta . It is the type species of the genus Helicodonta Férussac, 1821.

literature

  • Rosina Fechter and Gerhard Falkner: molluscs. 287 pp., Mosaik-Verlag, Munich 1990 (Steinbach's Nature Guide 10) ISBN 3-570-03414-3
  • Jürgen H. Jungbluth and Dietrich von Knorre: Common names of land and freshwater mollusks in Germany (Gastropoda et Bivalvia). Mollusca, 26 (1): 105-156, Dresden 2008 ISSN  1864-5127 PDF
  • Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg & Berlin 1983 ISBN 3-490-17918-8
  • Ewald Frömming: Biology of the Central European Landgastropods. 404 p., Duncker & Humblot, Berlin 1954.

Web links