| Abstract from DBPedia | Arachnida (/əˈræknɪdə/) is a class of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. Almost all adult arachnids have eight legs, although the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. The term is derived from the Greek word ἀράχνη (aráchnē, 'spider'), from the myth of the hubristic human weaver Arachne, who was turned into a spider. Almost all extant arachnids are terrestrial, living mainly on land. However, some inhabit freshwater environments and, with the exception of the pelagic zone, marine environments as well. They comprise over 100,000 named species, of which 47,000 are species of spiders.クモ綱（クモこう、学名: Arachnida）、別名クモガタ綱・クモ形綱（クモがたこう）・蛛形綱（しゅけいこう・ちゅけいこう）は、鋏角類に属する節足動物の分類群（綱）の1つ。構成種はクモガタ類・クモ形類・蛛形類（英: arachnid）と総称される。学名は、古代ギリシア語で「クモ」の意があるアラクネ（Ἀράχνη, Aráchnē）に由来するが、本群はクモだけでなく、ダニやサソリなどをも含む、10万種以上に及ぶ大きなグループである。体は前体と後体の2部のみに分かれ、前者に触角と顎はなく、代わり鋏角（きょうかく）、触肢と8本の脚を持つ。 昆虫や多足類などの陸生節足動物と同じく、クモガタ類も一般に「虫」と扱われる動物であるが、昆虫とは別系統である。 (Source: http://dbpedia.org/resource/Arachnid) |
