Spermatological characters of the digenean Lecithostaphylus retroflexus (Molin, 1859) (Microphalloidea: Zoogonidae), a parasite of the teleost fish Belone belone gracilis - Kacem, H.; Ndiaye, P.; Neifar, L.; Torres, J.; Miquel, J. (Tissue and Cell, 2015)