フデイシ綱こう

noun

Graptolithina (extinct class of hemichordates)

Scientific taxonomic term for an extinct class of colonial marine organisms known as graptolites, used in paleontology and biology.

• フデイシ綱こうは古こ生せい代だいの示し準じゅん化か石せきとして重じゅう要ようである。

  Graptolithina are important as index fossils of the Paleozoic era.