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Issus (genus) : ウィキペディア英語版 | Issus (genus)
''Issus'' is a genus of 'planthoppers' belonging to the family Issidae of infraorder Fulgoromorpha of suborder Auchenorrhyncha of order Hemiptera. Like most members of the order Hemiptera (popularly known as the "bug" or "true bugs" order) they live on phloem sap that they extract with their piercing, sucking mouth parts. Planthoppers are the only animals known to possess a locomotive gear mechanism, and ''Issus coleoptratus'' is the first type of planthopper to have the mechanism formally described.〔 The gears in the insect legs are not connected to power ratios, and only synchronise the action of the jumping legs. == Description == The genus ''Issus'' includes small insects generally flightless with a stocky body, a brown body and forewings with strong pronounced ribs. They feed on phloem. Species of this genus are present in most of Europe, in the Near East and in North Africa. They typically live on European climbing ivy.〔
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