Rhabdosargus niger, the blackish stumpnose, is a species of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies.

The three type specimens were purchased in the Jagalchi Fish Market in Pusan where they had been imported to after being captured off the western coast of Kalimantan, the Indonesian part of Borneo.

[3] Rhabdosargus niger belongs to the genus Rhabdosargus, a name which is a refixes rhabdos, meaning "stick" or "rod", an allusion to the yellow abdominal band of Sargus auriventris, its type species, to Sargos, a name used for Sparid fish in ancient Greek at least as long ago as Aristotle but in this case is a reference to Sargus as a synonym of Diplodus.

This is the smallest of the species in the genus Rhabdosargus with a maximum published standard length of 28.9 cm (11.4 in).

[6] Rhabdosargus niger is known only from the type specimens and the precise location at which these were captured is not known, it was somewhere of the western coast of Kalimantan, Indonesia.