SEM showing mouth parts of Neonrosella vitiata (Darwin, 1854) A–C maxilla A overview of maxilla morphology B serrulated setae on upper lobe C serrulated setae on lower lobe D–E maxillule D overview E spines and serrulated setae on inferior angle F–H mandible F overview of mandible morphology and inset showing close-up of lower margin G bidentate 2nd teeth H tridentate 3rd teeth, quadri-dentate 4th teeth and single 5th teeth I–L labrum I overview of labrum morphology of interior labrum and inset showing close-up of teeth on labrum J close-up of teeth on right side of labrum K close-up on teeth on left side of labrum L exterior side of labrum M–N mandibular palp M overview of mandibular palp morphology N serrulated setae on superior margin O–Q penis O overview of whole penis on side view and inset showing basi-dorsal point (arrow head) on base of the penis P close-up on apex of penis Q annulation along penis. Abbreviations: ul, upper lobe of maxilla; ll, lower lobe of maxilla. Scale bars in µm.