Résumé
Passalurus ambiguus (Rudolphi, 1819) is one of the most common oxyurid nematodes to be found in domestic and wild rabbits worldwide. In order to identify and determine the morphological characteristics of this pinworm, the current research was conducted as a microscopic study, using a scanning electron microscope (SEM). Adult P. ambiguus were collected from naturally infected domestic rabbits in Egypt. Identification was made primarily by ordinary microscope, and subsequently, the morphological features were evaluated by SEM. Results indicate that SEM is a powerful tool to identify in detail the morphological characteristics such as the head, male cloacal area, female tail and the female copulatory plugs. All these features confirm the species is P. ambiguus and show the effectiveness of the SEM to differentiate P. ambiguus from related oxyurid species.