Abstract
A new species of acropomatid fish, Acropoma profundum, is described based on a single specimen, 40.1 mm in standard length, from the Solomon Islands (depth 1169-1203 m). It is distinguished from congeneric species by its unique long, U-shaped luminous gland, which extends from the throat to just in front of the anal-fin origin. The new species is further distinguished from its congeners by the following combination of characters: anus situated nearer to the pelvic-fin base origin than to that of the anal fin, proximal radial of first anal-fin pterygiophore with a trough-like recess, body depth 29.1% SL, and pectoral-fin rays 15. Acropoma profundum is the deepest-living species of its genus, and the smallest in size at sexual maturity.
