Vilhelmsen, L., N. Isidoro, R. Romani, H. H. Basibuyuk, and D. L. J. Quicke. 2001. Host location and oviposition in a basal group of parasitic wasps: the subgenual organ, ovipositor apparatus, and associated structures in the Orussidae (Hymenoptera, Insecta). Zoomorphology [was Zeitschrift für Morphologie der Tiere] 121:63-84.