1. Department of Veterinary Parasitology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt.
2. Faculty of Applied Biological Science, Gifu University, Gifu 501-1193, Japan.
3. Department of Veterinary Pathology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt.
4. Hone-Hone Dan, Osaka Museum of Natural History, Osaka 546-0034, Japan.
5. Department of Anatomy and Cell Biology, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea.