Xiphosurida

Japanese: Xiphosurida
Xiphosurida

…a general term for arthropods belonging to the order Xiphosurida. The only extant species are horseshoe crabs; the rest are known as fossils, dating back to the Ordovician period of the Paleozoic era, but species closely related to this genus have also been found in the Cambrian period.

*Some of the terminology explanations that mention "Xiphosurida" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…剣尾綱剣尾目Xiphosuridaに属する節足動物の総称。現生種はカブトガニ類だけで,その他は化石として知られ,古生代のオルドビス紀までさかのぼることができるが,さらにこの類と深い類縁関係にあるものはカンブリア紀からも発見されている。…

※「Xiphosurida」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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