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The nut weevil (''Curculio nucum'') is a medium-sized beetle, with an especially elongated snout, characteristic of the Curculionini tribe of the weevil family (Curculionidae). Its larvae develop in hazel nuts ''Corylus avellana'', being a serious pest in hazenut orchards. It occurs in most of Europe, from south Sweden, Finland and Great Britain to the Mediterranean. ==Description== This weevil ranges from 6 to 8.5 mm.〔() http://www.kerbtier.de/〕 The female's snout is as long as the rest of the body, with a reddish end. The male snout is about 1/3 shorter. The body cover is usually light brown, similar to the colour of mature hazelnuts. This species is often confused with another commonly occurring weevil of the same genera – the gland weevil, ''Curculio glandium'', which lives on oaks. Despite overall similarity, the weevils differ in some morphological details. ''Curculio nucum'' has broader segments of flagellum and the segments are covered with semi-erect hairs which in ''C. glandium'' are adpressed.〔() http://coleoptera.ksib.pl/search.php?l=en〕〔() http://www.colpolon.biol.uni.wroc.pl/curculio%20nucum.htm〕 ''Curculio glandium'' is considered as closely related to ''C. nucum'' and as ''C. undulatus'', all of which are grouped together in the "glandium clade". ''C. cameliae'' from Japan is also related to this group. Other similar species in Europe that live on oaks, such as ''Curculio pellitus'', ''C. venosus'' and ''C. elephas'' are gathered in the "elephas clade". Species in the elephas clade have convex elytra and a dense vestiture hiding the line of the first ventral segment, whereas the glandium clade weevils have flattened elytra and the first ventral segment clearly visible through the sparse scales. Tribe Curculionini differes from other weevils, and from other Coleoptera, by the unique cone-shaped mandibles that move vertically instead of horizontally.〔LeConte, J.L. & Horn, G.H. 1876. The Rhynchophora of America, North of Mexico. ''Proceedings of the American Philosophical Society'',15: i-xvi, 1-455〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Curculio nucum」の詳細全文を読む スポンサード リンク
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