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red slug
The red slug (''Arion rufus''), also known as the large red slug,〔(''Arion'' (''Arion'') ''rufus'' (Linnaeus 1758), Large red slug ) MolluscIreland. National Museums Northern Ireland. 2010.〕 chocolate arion〔(''Arion rufus''. ) Integrated Taxonomic Information System (ITIS).〕 and European red slug,〔Rosetta, R. (European red slug. ) Pacific Northwest Nursery IPM. Oregon State University.〕 is a species of land slug in the family Arionidae, the roundback slugs.
==Description==
This slug is distinguished from similar species by the position of its respiratory pore toward the front of its mantle, the lack of a keel on its back, and a wrinkled surface. It varies in color from orange or red to brown or black. The fringe of its foot is red-striped and its tentacles are dark.〔 It is 7 to 14 centimeters long.〔 Its mucus is sticky.〔Pearce, T. A., et al. (''Arion rufus'' (Linnaeus, 1758), Chocolate Arion. ) Identification Guide to Land Snails and Slugs of Western Washington.〕
The eggs are about half a centimeter long and are whitish when new, turning yellow-brown.〔
It is very similar to the black slug, ''A. ater''. The two can only be distinguished with certainty by dissection or molecular analysis.〔 It has been treated as a subspecies of ''A. ater'' in the past.〔(''Arion rufus''. ) NatureServe. 2012.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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