| 词条 | Arion circumscriptus |
| 释义 |
| name= Brown-banded arion | image = Arion.circumscriptus.jpg | image_width = 240px | image_caption = Brown-banded arion (Arion circumscriptus), partially retracted | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia= clade Heterobranchia clade Euthyneura clade Eupulmonata clade Stylommatophora informal group Sigmurethra | superfamilia = Arionoidea | familia = Arionidae | subfamilia = | genus = Arion | subgenus = | species = A. circumscriptus | binomial = Arion circumscriptus | binomial_authority = Johnston, 1828 | synonyms = }} Arion circumscriptus, common name Brown-banded arion, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae. DescriptionThis slug species is up to 40mm when mature.[1][2] It is listed as 50 mm long in Welter-Schultes [3] It is a roundback slug. Its color 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; the one on the right runs above the pneumostome. The dorsum often has a very slight keel and the slug is bell-shaped in transverse section when it is contracted. The sole is whitish, and the mucus colourless. Genitalia: the atrium is large; the epiphallus is heavily pigmented and wider than the vas deferens; the oviduct is short and not narrow; the spermatheca is elongate.[3] DistributionArion circumscriptus is found mainly in the mid and northern latitudes in Europe. The distribution type is European Temperate. This species occurs in countries and islands including:
This species has been introduced in:
ParasitesParasites of Arion circumscriptus include:
TaxonomyThe original description of the three slug species 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 2006 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 that the putative genital differences were not confirmed by subsequent multivariate morphometric analyses. Analysis of alloenzyme and albumen gland proteins gave conflicting results. Also there was evidence of interspecific hybridization in places where these predominantly self-fertilizing slugs apparently outcross, contradicting their status as biological species. Molecular studies led to the conclusion that the three members of Carinarion are a single species-level taxon.[7] The name Arion fasciatus has priority. References1. ^{{cite web|title=Arion fasciatus group: Arion circumscriptus|url=http://idtools.org/id/mollusc/factsheet.php?name=Arion%20fasciatus%20group:%20Arion%20circumscriptus|work=Terrestrial Mollusc Tool|publisher=University of Florida|accessdate=20 February 2013}} 2. ^{{cite web|title=Arion circumscriptus Johnston, 1828 Brown-banded Arion|url=http://academic.evergreen.edu/projects/ants/TESCBiota/mollusc/key/ari_cir/ari_cir.htm|publisher=Evergreen State College|accessdate=20 February 2013}} 3. ^1 Animalbase (Welter-Schultes). 4. ^Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109. 5. ^Land Snails of Pennsylvania {{webarchive|url=https://web.archive.org/web/20090123102545/http://carnegiemnh.org/mollusks/palandsnails/systematic.htm |date=2009-01-23 }}. accessed 20 January 2009. 6. ^Michigan Department of Natural Resources and Environment. "Brainworm". accessed 14 December 2010. 7. ^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 External links{{commonscat|Arion circumscriptus}}
2 : Arion (gastropod)|Gastropods described in 1828 |
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