On Fourteen Monostiliferous Hoplonemerteans from the Izu Peninsula, Middle Japan

Abstract

Of the fourteen species dealt with in this paper, two (Amphiporus cervicalis, Nipponnemertes punctatulus) have previously been reported from Japan; three others (A. imparispinosus, N. pulchra, Tetrastemma melanocephalum) are added to the fauna. Four species (Emplectonema mitsuii, Paranemertes katoi, N. ogumai, T. roseocephalum) have been discussed by Crandall, Kajihara, Mawatari, and Iwata (2001). Three of the nemerteans (A cervicalis, A. imparispinosus, N. punctatulus) are known to occur in the eastern North Pacific, and two were originally found in Europe. Five species, belonging to the genera Paranemertes, Amphiporus, Nipponnemertes, and Tetrastemma, though long known from the Japanese fauna, have not yet been given specific names.