Fossil Arthropods - Fossil Arthropods

Japanese: 化石節足動物 - かせきせっそくどうぶつ
Fossil Arthropods - Fossil Arthropods

...The Swedish fossil fauna also includes nauplius fossils, and various previously unknown microarthropods have been discovered. The phylogenetic analysis of fossil arthropods requires anatomical findings of a precision comparable to that of extant organisms, but the degree of preservation of fossil specimens is generally far below that, and they often rely on external morphology. However, with recent advances in ultra-soft X-ray photography, it has become possible to analyze the appendages of various extinct organisms, such as trilobites, as well as the arrangement and structure of muscles and nervous systems, and the accuracy of phylogenetic analysis is improving.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また,このスウェーデンの化石動物群中には,ノープリウス期の化石が含まれ,さらに旧来知られていなかった種々の微小節足動物も検出されている。 化石節足動物の系統論には,現生生物と見合った精度の解剖学的所見を必要とするが,化石資料の保存度は一般にそれをはるかに下回り,外部形態に依存することが多い。しかし,最近では超軟X線写真技術が進歩し,三葉虫など各種絶滅生物の各部位付属肢をはじめ,筋の配列・構造,神経系なども解析できるようになってきたので,系統論の精度は高められつつある。…

※「化石節足動物」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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