Mask snail

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Mask snail
Mask snail (Isognomostoma isognomostomos)

Mask snail ( Isognomostoma isognomostomos )

Systematics
Subordination : Land snails (Stylommatophora)
Superfamily : Helicoidea
Family : Schnirkelschnecken (Helicidae)
Subfamily : Ariantinae
Genre : Isognomostoma
Type : Mask snail
Scientific name
Isognomostoma isognomostomos
( Schröter , 1784)

The mask screw ( Isognomostoma isognomostomos ) is a Landschneckenart from the family of Helicid (Helicidae) in the subordination of terrestrial snails is provided (gastropod). The name mask snail comes from the mouth of the shell, which is reminiscent of a grinning mouth.

features

The housing is flat-cone-shaped and measures 4-7 × 11-14 mm. It has 5 to 6 turns with moderately arched whorls. The periphery of the passage is rounded, the underside is flattened. The navel is slit and sometimes covered by the edge of the mouth. The basal edge and the outer edge of the mouth are thickened on the inside like a lamella, the outer edge and basal edge are tooth-like. The case mouth is rounded-triangular. The shell is relatively thin and translucent; it is horn-brown in color. The top is finely grained and covered with fine, relatively long hairs.

The back, head and antennae of the animal are almost black in color, the sole is gray.

Way of life, occurrence and distribution

The mask snail prefers to live in the rock debris of relatively moist deciduous forests in the mountains or in the hill country. In the vertical it occurs from about 300 m to about 1800 m height. It feeds on rotted parts of plants, but also mushrooms. For the winter rest, the housing is closed with a chalky epiphragm .

The mask snail occurs in the central part of Central Europe. The distribution area extends from the Spanish Pyrenees in the west, through central France and southeastern Belgium, through Switzerland, the southern half of Germany, the Czech Republic, Austria to Poland, Latvia, further in the south via Hungary to southern Russia. But it occurs only very scattered within this area.

Reproduction

Like all land snails, the mask snail is a hermaphrodite. The animals fertilize each other; the partner is stimulated with a 2.2 mm long, chalky love arrow . The eggs are laid at the end of June / beginning of July. Otherwise, little is known about reproduction. The animals can live up to five years.

Systematics

The species was first described in 1784 by the naturalist Johann Samuel Schröter under the name Helix isognomostomos . The species was later described under the name Helix personata Lamarck, 1792. This name is a more recent synonym for Isognomostoma isognomostomos .

Danger

The occurrences of the mask snail are very scattered; the mask snail is therefore not a common animal. However, they are still relatively numerous in suitable habitats. It is therefore not considered endangered in Germany.

Mollusk of the year

The mask snail was 2007 mollusk of the year . "The title is awarded by a board of trustees that has set itself the task of informing the public about selected species and, in this way, to make molluscological topics and nature conservation problems known."

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literature

  • Klaus Bogon: Land snails biology, ecology, biotope protection. 404 p., Natur Verlag, Augsburg 1990 ISBN 3-89440-002-1
  • Rosina Fechter / Gerhard Falkner: Mollusks . Mosaik-Verlag, Munich 1990, ISBN 3-570-03414-3 , ( Steinbach's natural guide 10).
  • 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

Individual evidence

  1. ↑ a b c Karl-Heinz Beckmann and H. Kobialka: Molluscs of the year 2007. Flyer PDF online

Web links