Stilestrongylus azarai. A, B. Female posterior end: A. Ventral view; B. Right lateral view; C, D. Anterior end: C. Curved and wrinkled, right lateral view (male); D. Stretched, left lateral view (female); E. Female synlophe in transverse section at midbody; F, G. Male: F. Genital cone, right lateral view; G. Right lobe of caudal bursa, dorsal view; H, I. Female, posterior end: H. Ventral view; I. Right lateral view. 2r-6r - right bursal rays 2 to 6; p0 - single papilla 0; p7 - paired papillae 7. Scale bars: 50 µm (A–D, G–I); 20 µm (E, F). A–C from paratypes of S. azarai. D from another specimen in A. azarae from the type locality (Balcarce). E, H, and I from a paratype of S. oryzomysi from Campana. F and G from other specimens in A. azarae from Campana.