Synonymy, redescription, molecular characterisation, and new distribution data of species of Stilestrongylus and Guerrerostrongylus (Nematoda, Heligmonellidae) parasitic in sigmodontine rodents from Argentina and Uruguay: a collection-based survey

Stilestrongylus azarai. A, B. Synlophe in transverse section at midbody: A. Male; B. Female; C. Male caudal bursa, ventral view showing papillae 2; D. Right lobe of bursa, dorsal view; E. Left lobe of bursa, dorsal view; F. Dorsal lobe of bursa, dorsal view; G. Genital cone, left lateral view. 2l-6l - left bursal rays 2 to 6; 8l - left ray 8; 2r-6r - right bursal rays 2 to 6; 8r - right ray 8; p0 - single papilla 0; p7 - paired papillae 7. Scale bars: 20 µm (A, B, E); 50 µm (C, D, F, G). C, G from paratypes. A, B, and D–F from other specimens in A. azarae from the type locality (Balcarce).