Cepobroticus Wheeler, 1925[2] Wheelerimyrmex Mann, 1922[2] Megalomyrmex is a genus of ant in the subfamily Myrmicinae.

The tribal characters include a bicarinate clypeus and a median clypeal seta.

Nevertheless, the genus has a distinctive habitus: the antenna is 12-segmented with a 3-segmented club; the general integument is smooth and shiny without coarse sculpture or dull areas; the promesonotum is evenly arched, without promesonotal groove; the propodeum is usually smoothly curved between dorsal and posterior faces, at most with blunt, broad-based tubercles, and never with spines; and the hind tibial spur is simple.

[3] The hypothesis that alkaloids act at a distance converges with what is known for the genera Solenopsis, Monomorium and Megalomyrmex when workers release volatile venom alkaloids by waving their stingers (i.e., gaster flagging) during interspecific encounters causing their enemies to flee.

[5] Although widespread in the Neotropics, from southern Mexico to northern Argentina, Megalomyrmex species are never abundant.