Acestrorhynchus heterolepis is a species of fish in the family Acestrorhynchidae.

[2] It was described by Edward Drinker Cope in 1878, originally under the genus Xiphorhamphus.

[1] It inhabits the Amazon, Negro and Orinoco Rivers.

It reaches a maximum standard length of 40.8 cm (16.1 in).

[2] A. heterolepis feeds on bony fish.