about 396 Antichthonidris Nothidris Phacota others Monomorium is a genus of ants in the subfamily Myrmicinae.

[3] This genus is very diverse in morphology, with species of many shapes and sizes that "do not necessarily even remotely resemble one another" at first glance.

[4] The exact boundaries of the genus are still to be determined: it has no distinct morphological traits that set it apart from other genera in the tribe Solenopsidini.

If cladistics were strictly applied, all Solenopsidini would be grouped in the single genus Solenopsis, but the tribe lacks a strong synapomorphy.

A 2015 study resurrected the previously synonymised genus Syllophopsis (including Ireneidris) from within Monomorium.