…The terminal segment is a movable finger that interlocks with the blade-like fixed finger at the end of the next segment, and the inner edges of the fingers that face each other often have tooth-like projections. The first walking leg (cheliped) of crabs and crayfish and the second leg (pedipalp) of scorpions often form particularly powerful pincers. Different species form pincers with different appendages: the first leg (chelicera) and the second to fifth legs (walking legs) of horseshoe crabs, the first leg (chelicera) of spiders and scorpions, the second thoracic leg of tanaids, and the first to third walking legs of shrimps. … *Some of the terminology that mentions "forceps" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…末端節は可動指となり,次節の末端部が伸長した刀状の不動指との間でかみ合うようになっているもので,両指の対面する内縁には歯状の突起を備えていることが多い。カニ類,ザリガニ類の第1歩脚(鉗脚(かんきやく)cheliped)やサソリ類の第2肢(脚鬚(きやくしゆ)pedipalp)は,とくに強大なはさみを形成することが多い。カブトガニ類では第1肢(鋏角(きようかく)chelicera)および第2~5肢(歩脚),クモ類,サソリ類でも第1肢(鋏角),タナイス類では第2胸肢,クルマエビ類では第1~3歩脚がはさみになるなど,種類により異なる付属肢ではさみが形成されている。… ※「鉗脚」について言及している用語解説の一部を掲載しています。 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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