On 15 April 1998, a single specimen of an agonid fish (153 mm SL, sex unknown) was collected from the western North Pacific, 37°59'N, 142°09'E (off Miyagi Pref., Honshu, Japan), at 700 m depth (3.4° bottom temperature).This specimen is identified with
Bathyagonus nigripinnis Gilbert, owing to the agreement of following characters with diagnosis of the species: first preopercular spine with a supplementary spine, no barbels on mandible, lower jaw projecting forward beyond upper jaw, lachrymal with serrated ridge and margins, 45 lateral line plates and all fins being bluish black, although the minor differences, which can be regarded as the intraspecific variation, between present specimen and previous descriptions of
B. nigripinnis were also recognized in the numbers of the dorsal fin ray, caudal fin ray and middorsal plate, and lengths of head and pectoral fin.This record represents a first occurrence of this species from Japan.
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