Abstract / Introduction / Summary:
A dense population of chaetopterid tubes of Mesochaetopterus japonicus (Fujiwara, 1934) is found from the tidal flat of Hitotsuba Inlet, Miyazaki city. A porcelain crab, Polyonyx sinensis Stimpson, 1858, is known to live in the chaetopterid tube. While numerous studies have been conducted on the occurrence of the crab, there is little research on its ecology and life cycle. Therefore, we tried a three-year observation for clarifying their life history characteristics.
