CONICET | Buscador de Institutos y Recursos Humanos

Cranifera robustum n. sp. (Nematoda, Thelastomathidae) a parasite of larvae of Cyclocephala signaticollis (Coleoptera, Scarabaeidae) from Buenos Aires province, Argentina is described and illustrated. C. robustum n. sp. is characterized by having the cuticle striated more prominent near the anterior end, the intestine caecum lacking, the stoma is small, the oesophagus is long, thin with irregular walls in male and regular one in female, with a basal bulb rounded and valvated, the nerve ring is in the middle of the corpus of the oesophagus, the excretory pore located at the base of oesophagus in bothsexes, vulva is not protruding near posterior middle of the body, vagina is short, two ovaries didelphic, amphidelphic, eggs ellipsoidal, tail appendage short and conical in both sexes, male with one spicule slightly curved, the gubernaculum is absent, and the genital papillae in male arranged as follow: three pairs of genital papillae, which two large ventral preanal papillae and one ventral pair postanal papillae.