Merodon serrulatus male genitalia. A Epandrium, lateral view B Epandrium, ventral view C, D Posterior surstyle lobe, lateral view E Hypandrium, lateral view F Part of hypandrium, ventral view G Aedeagus, lateral view. Abbreviations: al–anterior surstyle lobe, bp–basolateral protrusion, c–cercus, l–lingula, pl–posterior surstyle lobe, s–lateral sclerite of aedeagus. Scale bar: 0.2 mm.