原げん索さく動どう物ぶつ

noun

protochordate

A zoological term for primitive chordates, including tunicates and lancelets. Used in academic and biological contexts.

• 原げん索さく動どう物ぶつは脊せき索さく動どう物ぶつの一いち群ぐんで、ホヤやナメクジウオが含ふくまれる。

  Protochordates are a group of chordates that includes sea squirts and lancelets.