A new species of nematode found in the intestine of Eupsophus calcaratus
(Anura: Leptodactylidae) from Yaldad, Chile (45 degrees 5'S; 73 degrees
43'W) is described. This new nematode is compared with other South American
species of the genus. Aplectana artigasi differs from the only known
Chilean species, Aplectana chilensis, as the former has a greater number of
postanal papillae and a double papilla in the ventral region of the tail.