A New Grenadier Fish of the Genus Lucigadus (Macrouridae, Gadiformes, Teleostei) from the Emperor Seamounts, Northwestern Pacific

摘要

Lucigadus borealis sp. nov. is described from seven specimens collected in 409 m on Koko Guyot of the Emperor Seamounts chain. It represents the seventh and the most-northerly species of the genus. The new species is most similar in overall characters to L. nigromarginatus Smith and Radcliffe, 1912 of the Philippines, but is readily distinguished by the higher counts of pelvic-fin rays and gill rakers. So far as we know, 15 species of grenadiers (in two families and nine genera) are found on the Emperor Seamounts, but the taxonomic status of three of those are yet to be determined. Four of the 15 species are endemic to the seamount chain, two are also found on the Kyushu-Palau Ridge, and one is also found in Hawaii.