Eine neue Ophryotrocha-Art (Polychaeta, Eunicidae) aus Japan

Abstract

A new Japanese species of Ophryotrocha is described. It is characterized by oblong cells forming star-shaped glands of unknown function on the 6th to 12th of the youngest segments. Ophryotrocha notoglandulata n. sp. is closely related to Ophryotrocha labronicaBacci &La Greca; both have the same chromosome number (2 n=6). The new species is gonochoristic with a sex ratio of approximately 1.5:1. In mass culture as well as in couples, no mutual influence on sex determination was found. It is impossible to obtain hybrids between O. labronica and the new species. © 1972 Biologischen Anstalt Helgoland.