Megalothorax potapovi sp. n. Chaetotaxy of head A dorsal side B ventral side; chaetotaxy of antenna C anterior side D posterior side; labrum and maxillary outer lobe E anterior side F posterior side; palp of labium G focused on ventral chaetae H focused on distal chaetae I hypostomal papillate chaeta. * indicates a supplementary chaeta, absent in other specimens.