SEM micrographs of genitalia. A, C, E, F: Abaycosa nanica (Mello-Leitão). B, D, G, H: Abaycosa paraguensis (Gertsch & Wallace). A, B: Epigyne, ventral view, in top right corner detail of the posterior margin. C, D: Vulva, dorsal view. E, H: Male bulb ventral view. F, G: Male bulb ventral view, detail of the median apophysis. Abbreviations: FD fertilization ducts, HS head of spermatheca, MA median apophysis, PA palea, T tegulum, TA terminal apophysis, VC vulval chamber. Scale bars, A, B, D, E, H 0.10 mm, C 0.05 mm.