Coelorinchus posteromaculatus (Actinopterygii, Gadiformes, Macrouridae), a new species of grenadier from the eastern Ind
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Coelorinchus posteromaculatus (Actinopterygii, Gadiformes, Macrouridae), a new species of grenadier from the eastern Indian Ocean Naohide Nakayama1 · Artem M. Prokofiev2,3 · Toshio Kawai4 Received: 17 December 2019 / Revised: 4 March 2020 / Accepted: 5 March 2020 © The Ichthyological Society of Japan 2020
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%). Keywords Taxonomy · Description · Pisces · Quincuncia · Coelorinchus argentatus group
Introduction Coelorinchus Giorna 1809 is the largest genus among the order Gadiformes, with about 120 valid species worldwide (Iwamoto and Williams 1999; Iwamoto et al. 2006, 2015; This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as EAFB041D-5A6A-4404B43D-130918194A4C. This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number. * Naohide Nakayama [email protected] 1
Department of Marine Biology, School of Marine Science and Technology, Tokai University, 3‑20‑1 Orido, Shimizu, Shizuoka 424‑8610, Japan
2
A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii Prospekt 33, Moscow 119071, Russia
3
P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii Prospekt 36, Moscow 117218, Russia
4
Faculty of Fisheries Sciences, Hokkaido University, 3‑1‑1 Minato‑cho, Hakodate, Hokkaido 041‑8611, Japan
Nakayama and Endo 2017). The species of the genus are typically found on continental shelves and slopes in tropical and temperate waters of the world’s oceans (Merrett and Iwamoto 2000; Iwamoto and Graham 2008; Nakayama and Endo 2017). Although its highest diversity lies in Southeast Asia, only a few recent works have attempted to establish the inventory of the deep-sea fish fauna in the region (e.g., Gloerfelt-Tarp and Kailola 1984; White et al. 2013). In their book on the demersal fishes trawled from eastern Indian Ocean between southern Indonesia and northwestern Australia, Gloerfelt-Tarp and Kailola (1984) provided a color photograph of a unique Coelorinchus with a prominent dark bl
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