|Brown-banded arion (Arion circumscriptus), partially retracted|
informal group Sigmurethra
Slug is up to 40mm when mature. 50 mm long in Welter-Schultes  It is a roundback slug. In colour it is dark grey (sometimes with bluish hue) or brown.The mantle has dark spots, the sides are usually lighter near the foot-fringe and have one dark longitudinal band on each side, running above pneumostome. The dorsum often has a very slight keel and the slug is bell-shaped in transverse section when contracted. The sole is whitish and the mucus colourless. Genitalia:Atrium large, epiphallus heavily pigmented and wider than vas deferens, oviduct short and not narrow, spermatheca elongate.
Arion circumscriptus is found mainly in middle and northern latitudes in Europe.The distribution type is European Temperate This species occurs in countries and islands including:
It has been introduced in:
Parasites of Arion circumscriptus include:
The original description of the three slugs in the subgenus Carinarion, Arion (Carinarion) fasciatus, Arion (Carinarion) silvaticus and Arion (Carinarion) circumscriptus was based on small differences in body pigmentation and details of the genital anatomy. A recent study of these morphospecies (typological species) claims that previous studies had shown that body colour in these slugs may be influenced by their diet, and the genital differences were not confirmed by subsequent multivariate morphometric analyses.Analysis of alloenzyme and albumen gland proteins had given conflicting results.Also that evidence of interspecific hybridization in places where these predominantly self-fertilizing slugs apparently outcross contradicted their status as biological species. Molecular studies led to the conclusion that the three members of Carinarion are a single species-level taxon. The name Arion fasciatus has priority.
- "Arion fasciatus group: Arion circumscriptus". Terrestrial Mollusc Tool. University of Florida. Retrieved 20 February 2013.
- "Arion circumscriptus Johnston, 1828 Brown-banded Arion". Evergreen State College. Retrieved 20 February 2013.
- Animalbase (Welter-Schultes).
- Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109.
- Land Snails of Pennsylvania Archived 2009-01-23 at the Wayback Machine.. accessed 20 January 2009.
- Michigan Department of Natural Resources and Environment. "Brainworm". accessed 14 December 2010.
- Sofie Geenen, Kurt Jordaens, Thierry Backeljau: Molecular systematics of the Carinarion complex (Mollusca: Gastropoda: Pulmonata): a taxonomic riddle caused by a mixed breeding system. Biological Journal of the Linnean Society, 89(4): 589–604, London 2006 doi:10.1111/j.1095-8312.2006.00693.x
|Wikimedia Commons has media related to Arion circumscriptus.|
- Arion circumscriptus at Animalbase taxonomy,short description, distribution, biology,status (threats), images
- Arion circumscriptus on the UF / IFAS Featured Creatures Web site
- Arion circumscriptus at the Encyclopedia of Life
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