Comparisons of MI among Strumigenys spp. A accounts of 961 species and morphospecies globally representing all species groups B MI of 52 Strumigenys identified as not smooth and shining cuticular surface of the head in full frontal view. Light yellow points are species without trap-jaws, dark red points are those with trap-jaws. Strumigenys ayersthey sp. nov. is marked with an open black circle and possesses trap-jaw mandible morphology.