The genus was described in 2014 based on the workers of a single species, K. inusualis, originally described by Fernández (2007) and provisionally placed in Monomorium awaiting a better understanding of the internal relationships in Myrmicinae.

Given that these aforementioned taxa are not closely related to Kempfidris, their structures are probably not homologous, but perhaps convergent evolution could be considered, especially in the case of the dacetine ant.

Other specialized pygidial structures found in ants are the denticles or spines of Cerapachyinae (now Dorylinae) and the large, upward-curving teeth in Pachycondyla crassinoda workers, but their position and form are very different.

Specimens from Rondônia, Brazil, differ from other conspecific workers by their darker color (almost black) and more prominent propodeal crests that form small denticles.

All things considered, this could also be a collecting artifact, as the aforementioned period approximately coincides with academic holidays in many universities and represents a lower probability of conflict between lectures and field trips.