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Redescription of Coelorinchus tokiensis (Steindachner and Döderlein 1887) (Actinopterygii: Gadiformes: Macrouridae), with comments on its synonymy

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Abstract

The taxonomic status of two grenadiers, Coelorinchus tokiensis (Steindachner and Döderlein 1887) and Coelorinchus longicephalus Okamura 1982, is revised based on the examination of their types and 42 additional specimens from Japan. Our examinations confirmed the two nominal species to be synonymous and C. longicephalus is herein regarded as a junior synonym of C. tokiensis. Coelorinchus tokiensis is redescribed and compared with similar congeners. The species belongs to the Coelorinchus tokiensis group (herein redefined) and differs from all other congeners in having the following combination of features: ca. six dark saddles on trunk and tail; light organ short, its length shorter than half orbit diameter; underside of head completely naked except for oval scaly patches on lower surfaces of preopercle; snout long (41–46 % of head length; 70–85 % of postrostral length), its dorsal profile almost straight in lateral view; tip of snout bluntly pointed, armed with three modified tubercles; lateral nasal ridge incompletely supported by nasal bone; premaxillary teeth in long tapered band, with outer series prominently enlarged, posterior end of tooth band almost reaching lateral corner of mouth; body scales covered with short, reclined, blade-like spinules in widely divergent, saw-toothed rows; lips usually pale; oral cavity blackish; gular and branchiostegal membranes dusky.

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Acknowledgments

We are deeply indebted to the following researchers and museum specialists who have variously supported this study: K.-T. Shao, M.-Y. Lee, Y.-C. Liao and P.-L. Lin (ASIZP); R. Asaoka (BSKU); T. Iwamoto and D. Catania (CAS); Y. Kai and R. Misawa (FAKU); J. Hashimoto (FFNU); S. Kimura and Y. Hibino (FRLM); K. Amaoka, M. Yabe, H. Imamura and T. Kawai (HUMZ); H. Motomura, M. Meguro and G. Ogihara (KAUM); H. Senou (KPM); S. Tomiyama (MSM); M.-D. Wandhammer (MZS); P. McMillan (NIWA); H.-C. Ho (NMMBP); G. Shinohara, M. Nakae, T. P. Satoh, E. Katayama and K. Matsuura (NSMT); K. Hoshino and M. Okamoto (SNFR); and A. Fukui and M. Takami (Tokai University). Our sincere thanks go to K. Amaoka (HUMZ) who shared his knowledge of the Döderlein’s Collections. Fig. 7j was kindly provided by H. Senou (KPM). We also thank Y. Yamamoto and T. Matsuzaki (Center for Advanced Marine Core Research, Kochi University) for their technical assistance, and G. Yearsley (Hobart) for editing the English text. This study was partly supported by a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science, Tokyo (24370041), a Grant-in-Aid of the “Marine Science Project” of the Natural Science Cluster, Science Unit, Kochi University, the “Kuroshio Sougou Project” of the National Museum of Nature and Science, Tsukuba, and by a grant awarded to the second author from the Mikimoto Fund for Marine Ecology.

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Authors and Affiliations

  1. Laboratory of Marine Biology, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan

    Naohide Nakayama & Hiromitsu Endo

  2. Seikai National Fisheries Research Institute, 1551-8 Taira-machi, Nagasaki, 851-2213, Japan

    Mizuki Matsunuma

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  1. Naohide Nakayama
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  2. Mizuki Matsunuma
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  3. Hiromitsu Endo
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Correspondence to Naohide Nakayama.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as 13B12E78-C1BC-4DA8-8F98-4804783983F8.

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Nakayama, N., Matsunuma, M. & Endo, H. Redescription of Coelorinchus tokiensis (Steindachner and Döderlein 1887) (Actinopterygii: Gadiformes: Macrouridae), with comments on its synonymy. Ichthyol Res 63, 247–259 (2016). https://doi.org/10.1007/s10228-015-0493-4

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