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Abstract
The present study deals with some studies on some helminth parasites infecting birds in Egypt. The majority of individuals that were used in the present study caught from Abo-Rawash area at Giza, El-fayium and Sharkia Governorates, and these individuals are of two species (Columba livia and Streptopelia senegalensis). It was found that the rate of infection with helminth parasites (Cestodes only) was 58.5% (117 out of 200 individuals). And it was found that Columba livia and Streptopelia senegalensis infected with two species of cestodes, Cotugnia polycantha and killigrewia delafondi. Also, the present data investigated the effect of bird sex on the prevalence of these cestodes. In the present study, the ultrastructure of spermiogenesis of the cestodes C. polycantha and K. delafondi of the two hosts C. livia and S. senegalensis was described and it was found that the type of spermiogenesis of these cestodes belongs to the type IV of the cestode spermiogenesis according to the classification of Bâ and Marchand (1995). Also, the ultrastructure of spermatozoon of C. polycantha and K. delafondi of the both hosts C. livia and S. senegalensis was demonstrated in the present work, and it was found that the spermatozoon of C. polycantha of C. livia consists of five regions (I-V), while the spermatozoon of C. polycantha of S. senegalensis consists of four regions (I-IV), and the spermatozoon of K. delafondi of C. livia consists of four regions, while the spermatozoon of K. delafondi of S. senegalensis consists of five regions without any clear morphological discontinuity between them, but exhibiting distinctive ultrastructural characters.