 "M. rettenmeyeri", named after entomologist Carl Rettenmeyer, has an unusual longitudinal band of black hairs extending along the midline of the cephalothorax, enhancing its resemblance to "Camponotus sericeiventris", an ant it shares a habitat with.The black hairs correspond to the solid longitudinal keel-like dorsal extensions of the posterior sections of the ant's thorax.it contains ten species in North, Central, and South America