peanut worm; sipunculid
Any worm of the phylum Sipuncula. A biological term, but also encountered in general contexts such as tide-pool guides.
See also: 星口動物
I found a peanut worm on the rocks at low tide.
Peanut worms are classified under Sipuncula.
Katakana spelling is common for this organism name; usually written in kana.
Kanji spelling is possible but uncommon; the word is usually written in kana.
From 星 (hoshi, 'star') + 虫 (mushi, 'worm'), referring to the star-like introvert tentacles of these worms.