M. ergatogyna species is often mistaken for Monomorium minimum as they are similar in appearance.

This ant is a shiny black color and contains only a single worker caste, making them a monomorphic species.

It is also polygyne, meaning a colony contains multiple fertile queens living together.

Argentine ants (Linepithema humile) have been discovered to be actively pushing this species out of its original territory.

A few argue that the mainland species aren't actually ergatogyna but a different species or subspecies, they point to the size difference of island queens and mainland queens.