Potentially painful sting, but not considered a significant pest species.
Diagnosis of worker among Antkey species. Head ovoid. Antenna 10-segmented. Antennal club indistinct. Antennal scrobe lacking. Antennal insertion not surrounded by a raised sharp-edged ridge. Antennal scapes do not extend beyond posterior margin of head. Eyes extremely large (approximately half head length); 3 ocelli present. Mandibles triangular. Propodeum lacking spines or teeth. Either bicolored red and black or uniformly black.
Although Pseudomyrmex gracilis has a 2-segmented waist like myrmicines, it is immediately recognizable Among Antkey species by the combination of its enormous eyes and short antennal scapes. It has a wasp-like behavior, frenetically moving its antennae.