Descriptions of Two New Species of Valenciniidae (Nemertea) from Japanese Waters
2026 年 31 巻 1 号 p. 141-147
詳細
2026 年 31 巻 1 号 p. 141-147
I describe two new species of the nemertean family Valenciniidae from Japanese waters: Baseodiscus jimii sp. nov. from subtidal habitats and Cephalomastax fujiwarai sp. nov. from a piece of deep-sea sunken wood. The new species in Baseodiscus Diesing, 1850 is clearly distinguishable from its congeners by unique external coloration patterns and head morphology, whereas C. fujiwarai sp. nov. is readily separated from the only previously known congener, C. brevis Iwata, 1957, by its uniform body coloration. In addition, a new record of B. aff. marmoratus (Bürger, 1890) from Japanese waters is provided in this study. Phylogenetic analyses based on a concatenated dataset of partial sequences of two mitochondrial and three nuclear genes recovered their phylogenetic positions among Valenciniidae.
