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Diplura
The order Diplura is one of the four groups of hexapods, alongside insects, springtails and Protura. They are sometimes called "two-pronged bristletails".〔(【引用サイトリンク】title=Guide to New Zealand Soil Invertebrates )〕 Around 800 species have been described, of which around 70 occur in North America,〔 12 in Great Britain and two in Australia.〔(【引用サイトリンク】title=Diplura )〕
==Anatomy==
Diplurans are mostly long, although some species of ''Japyx'' may reach .〔 They have no eyes and, apart from the darkened cerci in some species, they are unpigmented.〔 They have long antennae with 10 or more bead-like segments projecting forward from the head,〔(【引用サイトリンク】title=Diplura )〕 and a pair of cerci projecting backwards from the last of the 11 abdominal somites.〔(【引用サイトリンク】title=Diplura )〕 These cerci may be long and filamentous or short and pincer-like,〔(【引用サイトリンク】title=Diplura )〕 leading to occasional confusion with earwigs.〔 These cerci give the group its name, from the Greek ''diplo'' ("two") and ''uros'' ("tail").〔 Some diplurans have the ability to shed their cerci if necessary (autotomy); of all terrestrial arthropods, only diplurans have the ability to regenerate these lost appendages over a series of moults.〔 Moulting occurs up to 30 times throughout the life of a dipluran, which is estimated to last up to one year.〔 The abdomens of diplurans bear eversible vesicles, which seem to absorb moisture from the environment and help with the animal's water balance.〔
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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