Jointed appendage

Japanese: 関節肢 - かんせつし（英語表記）jointed appendage

This refers to the appendages divided into segments that develop in arthropods. The segments articulate with each other and with the body segments at the base of the limb. The number of segments is thought to be eight in trilobites, seven in chelicerates, crustaceans, myriapods, and insects, and in trilobites, chelicerates, and crustaceans, numerous segmented limbs (exopods) derive from the basal limb alongside the main limb (endopod). The limbs are further segmented or fused secondarily, producing projections, spines, and bristles, and exopods disappearing, giving each appendage a unique shape according to its specific function.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

節足動物に発達した肢節に分かれた付属肢をいう。肢節は互いに関節するとともに，肢基部では体節とも関節する。肢節の数は三葉虫類では8，鋏角（きようかく）類，甲殻類，多足類，昆虫類では7が基本と考えられ，三葉虫類，鋏角類，甲殻類では基部肢節から主肢(内肢)と並んで多数に分節した枝肢(外肢)が派生する。肢節はさらに二次的に分節あるいは融合し，突起，とげ，剛毛などを生じ，外肢などを消失したりして，各付属肢はそれぞれ特有の役割に応じた独特の形になっている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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