Ultrastructure of the spermatozoon of the digenean Tergestia acanthocephala (Stossich, 1887) (Gymnophalloidea: Fellodistomidae): An intestinal parasite of Belone belone gracilis (Pisces: Teleostei) - Kacem, H.; Ndiaye, P.; Neifar, L.; Torres, J.; Miquel, J. (Tissue and Cell, 2015)