半はん索さく動どう物ぶつ

noun

hemichordate

A worm-like marine invertebrate of the phylum Hemichordata; a technical zoological term.

• 半はん索さく動どう物ぶつは、ギボシムシやフサカツギを含ふくむ海かい産さん無む脊せき椎つい動どう物ぶつの一いち群ぐんです。

  Hemichordates are a group of marine invertebrates that includes acorn worms and pterobranchs.