[7] Yoshimura and Fisher (2014) described six new Malagasy species and synonymized two existing names, Mystrium fallax and M. stadelmanni with M. voeltzkowi and M. mysticum, respectively.

[3] In December 2018, researchers from the University of Illinois, North Carolina State University and the Smithsonian Museum of Natural History conducted studies which found that ants of the species Mystrium camillae (also known as Dracula ants) can snap their jaws at speeds of up to 200 mph, making it the fastest recorded animal movement.

[9] Their research, published in the peer-reviewed Royal Society Open Science journal,[10] noted that the jaw structure was different from other strong-jawed ants in that "instead of using three different parts for the spring, latch and lever arm, all three are combined in the mandible."

Molet et al. (2006) demonstrated that, in some species of Mystrium known from Madagascar, normal queens are replaced by wingless reproductives which are smaller than workers.

In colonies of other species winged queens are missing and half of the female adults belong to wingless reproductives which are smaller and allometrically distinct from workers.