Megalomyrmex acauna is a Neotropical species of ants in the subfamily Myrmicinae.

It is similar to M. leoninus-group.

Its head width (HW) is 1.45—1.63 mm and head length (HL) is 1.68—1.75 mm.

Its scapus length (SL) is 2.13—2.28 mm.

[1][2][3] This Myrmicinae-related article is a stub.