Spider - Spider

Japanese: クモ(蜘蛛) - クモ

A general term for the arthropod order Araneae. The body consists of a cephalothorax and abdomen, and usually does not show body segments. They have modified palps instead of antennae. They do not have compound eyes, but usually have eight simple eyes. They have four pairs of walking legs. A poison gland opens at the end of the mandible, and in addition to a trachea, they have a unique lung as a respiratory system. In addition, there are usually three pairs of spinnerets at the rear of the abdomen, and at the end of these many thin tube-like spinnerets open. The type and number of spinnerets connecting to the spinnerets vary depending on the spider's species and gender, and the silk that comes out of these glands is used for different purposes (spider webs). All are carnivorous. They inject venom into their prey to weaken it, then digest it outside their mouths with enzymes released from their mouths, and absorb it in their pump-type stomachs. There are not only spiders that spin webs, but also trapdoor spiders that do not spin webs but build special webs instead, and wandering wolf spiders, and about 1,200 species are known in Japan.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

節足動物クモ目の総称。体は頭胸部と腹部からなり，普通，体節を示さない。触角の代りに肢の変形した触肢をもつ。複眼はなく，普通，単眼が８個。歩脚は４対。大顎の先には毒腺が開口，呼吸器として気管のほかに特有の書肺をもつ。また腹部後方には，普通３対の出糸（紡績）突起があり，その先端には多数の細管状の吐糸口が開く。吐糸口と連絡する出糸腺の種類や数はクモの種類・雌雄などによって違い，これから出る糸は用途に応じて使い分けられる（クモの巣）。いずれも肉食性。毒液を注射して弱らせた獲物を口から出した酵素で口外消化し，ポンプ式の胃で吸収する。網を張るものばかりでなく，網は張らないで特殊な巣を作るトタテグモ，徘徊(はいかい)性のコモリグモなどがあり，日本には約1200種が知られる。

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