Ichthyological Research

, Volume 65, Issue 1, pp 12–20 | Cite as

A new species of the grenadier genus Coelorinchus (Actinopterygii: Gadiformes: Macrouridae) from the Timor Sea, Eastern Indian Ocean

  • Naohide Nakayama
  • Hiromitsu Endo
Full Paper


Coelorinchus okamurai sp. nov. is described from five specimens collected in the Timor Sea at a depth of 610–690 m. The new species belongs to the Coelorinchus japonicus group (redefined in this study), and differs from all other congeners in having the following combination of features: snout moderately long, sharply pointed in lateral and dorsal views, length 39–42% of head length; lateral nasal ridge completely supported by nasal bone; light organ short, length less than 1/2 orbit diameter, its anterior margin falling far short of pelvic-fin bases; premaxillary teeth in short, uniformly wide band, with posterior end of the tooth band not reaching lateral corner of mouth; no teeth greatly enlarged; body scales covered with short, reclined, narrowly blade-like spinules in widely divergent rows; buttresses of body scale spinules scarcely developed; occipital scales between parietal ridges armed with divergent rows of long, erect, needle-like spinules; nasal fossa usually naked (a few small scales rarely present anteroventrally); patches of small scales sparsely distributed on ventral surface of head; scales on underside of head armed with 1–3 rows of short, erect, needle-like to knife-like spinules; interdorsal space longer than first dorsal-fin base length; subopercle terminating as a long, slender flap; body dark overall without prominent markings; fins uniformly blackish.


Taxonomy Morphology Deep-sea fish Indonesia 



We are deeply indebted to M. Motokawa (Kyoto University Museum) for his encouragement and generous help throughout this study. Our sincere thanks go to R.K. Hadiaty (MZB) and A. Mori (Kyoto University) who helped us to transfer the holotype from Japan to Indonesia. We also thank the following researchers and museum specialists for specimen loans and assistance during the first author’s visits to their institutions: K.-T. Shao and P.-L. Lin (ASIZP); J. Maclain and O. Crimmen (BMNH); M. Matsunuma and T. Naito (BSKU); T. Iwamoto and D. Catania (CAS); A. Graham and P. Last (CSIRO); S. Kimura, Y. Hibino, and D. Sasaki (FRLM); M. Yabe, H. Imamura, and T. Kawai (HUMZ); H. Motomura and O. Ogihara (KAUM); H. Senou (KPM); R. Causse (MNHN); J. Hashimoto (formerly Nagasaki University); M.-Y. Lee (National Taiwan University, formerly ASIZP); G. Shinohara, E. Katayama, M. Nakae, and K. Matsuura (NSMT); K. Hoshino and M. Okamoto (SNFR); and J.T. Williams, A. Nonaka, and G.D. Johnson (USNM). SEM images in Fig. 4 were provided by G. Shinohara and E. Katayama (NSMT). 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 16H06896 and JSPS Core-to-Core Program B. Asia-Africa Science Platforms.

Supplementary material

10228_2017_585_MOESM1_ESM.pdf (131 kb)
Supplementary material 1 (PDF 130 kb)


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Copyright information

© The Ichthyological Society of Japan 2017

Authors and Affiliations

  1. 1.The Kyoto University MuseumKyoto UniversityKyotoJapan
  2. 2.Laboratory of Marine Biology, Faculty of ScienceKochi UniversityKochiJapan

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