 In general, the body structure of all "Nothomyrmecia" castes demonstrates the primitive nature of the species.Notable derived features include vestigial ocelli on workers, brachypterous queens, and the mesoscutal structure on males.The morphology of the abdomen, mandibles, gonoforceps (a sclerite, serving as the base of the ovipositors sheath) and basal hamuli show it is more primitive than "Myrmecia".