Ultrastructure of Spermiogenesis and the Spermatozoon of Macracanthorhynchus hirudinaceus (Pallas, 1781) (Acanthocephala: Archiacanthocephala), a Parasite of the Wild Boar Sus scrofa - Foata, Joséphine; Culioli, Julia-Laurence; Marchand, Bernard (The Journal of Parasitology, 2005)