Three new species in Tetrastemma Ehrenberg, 1828 (Nemertea, Monostilifera) from sublittoral to upper bathyal zones of the northwestern Pacific.

ABSTRACT: Monostiliferous nemerteans in the genus Tetrastemma Ehrenberg, 1828 are generally characterized as having four eyes, and they occur worldwide, from the intertidal zone to the deep-sea bottom. Recent extensive sampling of Tetrastemma has explored the high species diversity, including many undescribed forms, but phylogenic analysis has revealed non-monophyly of the genus. We herein describe three new species of the genus (T.albumsp. nov., T.personasp. nov., and T.shohoensesp. nov.) from northwestern Pacific waters based on specimens collected by dredging or by use of a remotely operated vehicle at depths of 116-455 m. Since anatomical and histological characters traditionally used in systematics of the genus are sometimes interspecifica

SUBMITTER: Hookabe N 

PROVIDER: S-EPMC10208440 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature