陥かん入にゅう吻ふん

noun

introvert; eversible proboscis

A biological term for a retractable, tube-like feeding structure found in certain invertebrates, especially sipunculans (peanut worms).

• ホシムシの陥かん入にゅう吻ふんは、餌えさを捕とらえるために体たい外がいに伸のばされる。

  The introvert of a peanut worm is extended outside the body to capture food.