Megalothorax sanguineus sp. n. Chaetotaxy of head A dorso-posterior side B dorso-anterior side C ventral side; anterior process of labrum D posterior side E anterior side; maxillary outer lobe F dorsal side G ventral side; labium H focused on ventral chaetae and basolateral field I focused on distal chaetae J hypostomal papilla. Legend: blf = basolateral field of labium, of = oral fold.