Cranium morphology of Eburopone easoana sp. nov. workers, colony Eg17ix19-297, holotype (A–C, E) and nontype (D) A head in lateral view B occipital corners in posterior view C anterior part of cranium in ventrofrontal view D scanning electron microscopic (SEM) photograph of anterior part of cranium in dorsofrontal view, antennae and mandibles removed (left antennal bulbus remains) E torulo-posttorular complex and parafrontal ridges in posterior vertical view against its posterior face. Black arrows in A and C indicate a weak protrusion on lateroclypeal teeth. Abbreviations: ala – atalar acetabulum; oc – occipital carina; fl – frontal line; lct – lateroclypeal teeth; pfr – parafrontal ridge; tptc – torulo-posttorular complex.