The Opecoelidae sperm model and its contribution to phylogeny: Spermatozoon ultrastructural particularities of Allopodocotyle pedicellata (Plagioporinae, Digenea, Platyhelminthes) - Bakhoum, A. J.; Kacem, H.; Neifar, L.; Miquel, J. (Zoologischer Anzeiger, 2017)