Nicon sinica WU and SUN, 1979, a Newly Recorded Polychaete from Japan

Abstract

Nicon sinica WU and SUN, 1979 (Nereididae, Polychaeta) is newly recorded from Japan. More than 50 specimens of the species were captured by one catch of a beam trawl, off Daio-zaki at a depth of 425 m. Their morphological variability and the sexual modification of parapodia are described. As a result of the examination on parapodial modification associated with the sexual stage, Sinonereis heteropoda WU and SUN, 1979 is thought to be possibly referred to Nicon sinica.