土つちボタル

noun

glowworm

Refers to the larval or larviform female of certain firefly species that live in soil and emit light. In Japanese, it often specifically means the larvae of the Genji or Heike fireflies, or the wingless female glowworm.

• 夏なつの夜よる、土ど手てで土つちボタルが光ひかっていた。

  On a summer night, glowworms were glowing on the embankment.

• 土つちボタルは幼よう虫ちゅうのまま光ひかる。

  Glowworms glow while still in their larval stage.