[2] The lack of associated workers, in spite of abundant collecting (including many Winkler samples) at the type locality, raises the possibility that this species is a workerless social parasite.

Alternatively, workers may be subterranean associates of attines and thus not accessible to standard collection techniques.

In contrast, M. reina has a single large apical tooth, which is long and sharp, followed by a relatively uniform series of smaller teeth.

Many socially parasitic ant species have falcate mandibles associated with their ability to attack and subdue hosts.

Perhaps the long apical tooth of M. reina is such an adaptation, strengthening the conjecture that it may be a social parasite.