Marine Biodiversity

, Volume 49, Issue 2, pp 905–911 | Cite as

A new bathyal species of Cestoplana (Polycladida: Cotylea) from the West Pacific Ocean

  • Yuki OyaEmail author
  • Hiroshi Kajihara
Original Paper


We describe Cestoplana nopperabo sp. nov. from 292- to 439-m depths in Sagami Bay, Japan. This is the eighth member of the genus, representing the first report of a bathyal polyclad from the Indo-West Pacific. Cestoplana nopperabo sp. nov. is characterized by lacking eyespots; it shows no color pattern on the dorsal surface of the body, unlike other congeners. Based on partial 28S rDNA sequence, we infer the phylogenetic position of this species among other polyclads, for which sequences were available in public databases. The molecular phylogeny demonstrates that Cestoplana nopperabo sp. nov. is sister to the rest of the cestoplanids included in the analysis.


Deep sea Marine flatworm Maximum likelihood Platyhelminthes 



We thank Mr. Mamoru Sekifuji and Mr. Hisanori Kohtsuka (University of Tokyo), Dr. Akihito Omori (Niigata University), Dr. Hiroaki Nakano and Mr. Yasutaka Tsuchiya (University of Tsukuba), staff of the Misaki Marine Biological Station (University of Tokyo), and all participants in the 12th Japanese Association for Marine Biology (JAMBIO) Coastal Organism Joint Survey conducted at Misaki for the assistance in collecting specimen; Dr. Kevin C. Wakeman (Hokkaido University) for editing an earlier version of the manuscript; two anonymous reviewers for providing us constructive comments.


This study was funded by the Japanese Association for Marine Biology (JAMBIO) and Research Institute of Marine Invertebrates (No. 2017 IKU-3).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.

Sampling and field studies

All necessary permits for sampling and observational field studies have been obtained by the Japanese Association for Marine Biology from the competent authorities.


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Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of ScienceHokkaido UniversitySapporoJapan
  2. 2.Faculty of ScienceHokkaido UniversitySapporoJapan

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