Monday, April 24, 2017

[Ichthyology • 2017] Coelorinchus okamurai • A New Species of the Grenadier Genus Coelorinchus (Gadiformes: Macrouridae) from the Timor Sea, Eastern Indian

Coelorinchus okamurai  
Nakayama & Endo, 2017 

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.

Keywords: Taxonomy, Morphology, Deep-sea fish, Indonesia 

Fig. 1 Coelorinchus okamurai sp. nov. MZB 23338, holotype, 121 mm HL, 457+ mm TL.
a Lateral, b dorsal, and c ventral views of the entire specimen, preserved condition 

Etymology. The specific epithet, okamurai, is named in honor of Dr. Osamu Okamura (Professor Emeritus of Kochi University, deceased), who collected the type specimens of the new species.

Naohide Nakayama and Hiromitsu Endo. 2017. A New Species of the Grenadier Genus Coelorinchus (Actinopterygii: Gadiformes: Macrouridae) from the Timor Sea, Eastern Indian Ocean.
Ichthyological Research. 1–9.  DOI: 10.1007/s10228-017-0585-4

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