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Coelorinchus posteromaculatus (Actinopterygii, Gadiformes, Macrouridae), a new species of grenadier from the eastern Indian Ocean

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Abstract

A new species of grenadier, Coelorinchus posteromaculatus, is described from nine specimens collected from the tropical eastern Indian Ocean at depths of 100–323 m. This species belongs to the Coelorinchus argentatus group (defined here to include 13 species), but differs from other members of that group in its unique body markings consisting of a single, prominent, lateral, dark blotch on the anterior part of the tail, and a slightly diagonal, narrow, dark stripe extending from the upper margin of the gill opening to below the first dorsal-fin midbase or beyond. Coelorinchus posteromaculatus is most similar to C. gaesorhynchus Iwamoto and Williams 1999 and C. longissimus Matsubara 1943, but further differs from the former in its much shorter snout (74–91% of postrostral length vs. 93–100% in C. gaesorhynchus), and from the latter in its relatively small mouth (upper-jaw length 38–43% of postrostral length vs. 42–49%).

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Acknowledgements

We thank the following researchers and museum specialists for specimen loans and assistance for this study: M. McGrouther, A. Hay, S. Reader, and K. Graham (AMS); H. Endo, T. Yamakawa, and T. Naito (BSKU); A. Graham, J. Pogonoski, and P. Last (CSIRO); D.A. Astakhov, and S.A. Evseenko (IORAS). We are also grateful to the members of the Japan Deep Sea Trawlers Association (JDSTA), Overseas Fishery Cooperation Foundation, Japan (OFCF), and Research Institute for Marine Fisheries, Indonesia (RIMF), and to the crew of R/V Baruna Jaya IV, for providing an opportunity to sample in Indonesia. Gordon Yearsley (Hobart, Australia) reviewed an early draft of the manuscript and edited the English text. This study was supported by JSPS KAKENHI Grant Number JP16H06896 and JP18K14509 (to NN) and by a grant (19-14-00026) of the Russian Science Foundation (to AMP).

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Authors and Affiliations

  1. Department of Marine Biology, School of Marine Science and Technology, Tokai University, 3-20-1 Orido, Shimizu, Shizuoka, 424-8610, Japan

    Naohide Nakayama

  2. A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii Prospekt 33, Moscow, 119071, Russia

    Artem M. Prokofiev

  3. P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii Prospekt 36, Moscow, 117218, Russia

    Artem M. Prokofiev

  4. Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido, 041-8611, Japan

    Toshio Kawai

Authors
  1. Naohide Nakayama
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  2. Artem M. Prokofiev
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  3. Toshio Kawai
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Correspondence to Naohide Nakayama.

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Nakayama, N., Prokofiev, A.M. & Kawai, T. Coelorinchus posteromaculatus (Actinopterygii, Gadiformes, Macrouridae), a new species of grenadier from the eastern Indian Ocean. Ichthyol Res 67, 465–472 (2020). https://doi.org/10.1007/s10228-020-00741-x

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