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A woodlouse (plural woodlice), also known by many common names (see below), is an isopod crustacean with a rigid, segmented, long exoskeleton and fourteen jointed limbs. Woodlice form the suborder Oniscidea within the order Isopoda, with over 5,000 known species. Woodlice in the genus ''Armadillidium'' and in the family Armadillidae can roll up into an almost perfect sphere as a defensive mechanism, hence some of the common names such as pill bug or roly-poly. Most woodlice, however, cannot do this.〔(【引用サイトリンク】title=Suborder Oniscidea )〕 ==Common names== Common names for woodlice vary throughout the English-speaking world. A number of common names make reference to the fact that some species of woodlice can roll up into a ball. Other names compare the woodlouse to a pig. Names include: *"armadillo bug" *"boat-builder" (Newfoundland, Canada)〔(【引用サイトリンク】title=Dictionary of Newfoundland English - boat n )〕 *"carpenter" or "cafner" (Newfoundland and Labrador, Canada)〔(【引用サイトリンク】title=Dictionary of Newfoundland English - carpenter n )〕 *"cheeselog" (Reading, England) *"doodlebug" (also used for the larva of an antlion) *"pill bug" (usually applied only to the genus ''Armadillidium'') *"potato bug"〔 *"roly-poly" *"sow bug"〔 *"roll up bug" *"chiggy pig" (Devon, England)〔(【引用サイトリンク】publisher=BBC Devon )〕〔(【引用サイトリンク】publisher=The Urban Pantheist )〕 *"slater" (Scotland, Northern Ireland, New Zealand and Australia) *"gramersow" (Cornwall, England) *"butcher boy" or "butchy boy" (Australia, mostly around Melbourne) *"wood bug" (British Columbia, Canada)〔(【引用サイトリンク】title=Wood Bug )〕 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「woodlouse」の詳細全文を読む スポンサード リンク
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