Arion fasciatus
Gelbstreifige slug ( Arion fasciatus )
The Gelbstreifige slug ( Arion fasciatus ) is a nudibranch of the family of slugs ( Arionidae ) that is provided to the subordination of terrestrial snails ( gastropod ).
Description
The Gelbstreifige slug measures extended about 4 to 5 cm, exceptionally, to 70 mm. The back is yellow-brown to gray-brown; the colors are on the sides towards the foot pale, whitish at the base. The sides have faded, slightly darker Lateralbänder which is bounded towards the foot by a yellowish zone. The right Lateralband runs above the breathing hole. The sole is gray-white, the mucus colorless. The back shows a very weak keel. The young animals are light gray to light brown with dark Lateralbändern and a somewhat more noticeable keel. The atrium of the genital apparatus is relatively large, the epiphallus further than the vas deferens. The oviduct is relatively narrow and about as long as the epiphallus. The sperm is elongated bar.
Life, the occurrence and distribution
The species prefers to live in open, cultivated areas, gardens, parks, but also in Badlands. She eats preferably fresh plant material. The distribution area extends across Western, Central and Northern Europe.
System
The independence of the three species Arion fasciatus ( Nilsson, 1823) ( Gelbstreifige slug ), Arion silvaticus Lohmander, 1937 (forest slug ) and Arion circumscriptus Johnston, 1828 ( Grey Slug ) was provided by Sofie Geenen and co-authors in question in 2006. They found no consistent features in the genital anatomy still sufficient differences in DNA studies. The differences in coloration they lead to the establishment of color options back through long periods of self-fertilization. If confirmed, these results would Arion silvaticus Lohmander, 1937 and Arion circumscriptus Johnston, 1828 junior synonyms of Arion fasciatus ( Nilsson, 1823). All three species are found in which some authors did not use sub-genus Arion ( Arion Carin ) Hesse, 1926.
Differences
The two closely related species A. circumscriptus and A. silvaticus distinguished by the absence of the yellowish background color of the body. Usually these species are smaller than A. fasciatus.