A generic classification of Xenidae (Strepsiptera) based on the morphology of the female cephalothorax and male cephalotheca with a preliminary checklist of species

Macroxenos cf. piercei, female, cephalothorax, SEM micrographs A anterior part of cephalothorax, ventral side B anterior part of cephalothorax, dorsal side C mouthparts, ventral side D detail of anterior border of cephalothorax, ventral side E right mandible and maxilla, ventral side F left mandible and maxilla, ventral side. Abbreviations: dlf – dorsal field of labral area, fr – frontal region, md – mandible, mx – vestige of maxilla, mxp – vestige of maxillary palp, sbcl – segmental border between clypeus and labrum, smxg – submaxillary groove, ssf – supra-antennal sensillary field.