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Harvestmen are an order of arachnids often confused with spiders, though the two orders are not closely related. Research on harvestman phylogeny is in a state of flux. While some families are clearly monophyletic, that is share a common ancestor, others are not, and the relationships between families are often not well understood. ==Position in Arachnida== The relationship of harvestmen with other arachnid orders is still not sufficiently resolved. }} }} }} }} Up until the 1980s they were thought to be closely related to mites (Acari). In 1990, Shultz proposed grouping them with scorpions, pseudoscorpions and Solifugae ("camel spiders"); he named this clade Dromopoda. This view is currently widely accepted. However, the relationships of the orders within Dromopoda are not yet sufficiently resolved. When only considering recent taxa, the harvestmen appear as a sister group to Novogenuata (Scorpions, Pseudoscorpions, Solifugae).〔 When also considering fossils, the harvestmen are sister to Haplocnemata (Pseudoscorpions and Solifugae). Recent analyses have also recovered the Opiliones as sister-group to the extinct Phalangiotarbids, although this has low support. 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「Harvestman phylogeny」の詳細全文を読む スポンサード リンク
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