Spermatogenesis and spermiogenesis in Didymocystis wedli Ariola, 1902 (Didymozoidae, Digenea)

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

“…In other studies of Digenea spermiogenesis, the intercentriolar body can be totally absent (Justine and Mattei 1983;Pamplona-Basilio et al 2001), or may contain fewer electron-dense layers (Robinson and Halton 1982;Gracenea et al 1997Gracenea et al , 2000Levron et al 2003). In most cases, however, this structure is not mentioned.…”

“…Several studies have been performed, particularly concerning the Eucestoda (Baˆand Marchand 1995;Justine 2001). In the Digenea, sperm ultrastructure has been described for only 48 genera (Justine 1995; Gracenea et al 1997;Tang et al 1998;Miquel et al 2000;Baptista-Farias et al 2001;Pamplona-Basilio et al 2001;Ndiaye et al 2002Ndiaye et al , 2003aLevron et al 2003). A strong phylogenetic model has not been established in the Digenea because of this lack of data.…”

Sperm ultrastructure of the gall bladder fluke Anisocoelium capitellatum (Digenea: Cryptogonimidae), a parasite of Uranoscopus scaber (Pisces: Uranoscopidae)

“…This disposition is described in all the Digenean species with exception for Pronoprymna ventricosa (Quilichini et al 2007b), Didymozoon sp. (Justine and Mattei 1983), and Didymocystis wedli (Pamplona-Basilio et al 2001). As in some species, e.g., O. furcatus (Miquel et al 2000), Helicometra fasciata (Levron et al 2003), and M. parvus (Levron et al 2004a), cortical microtubules in the gamete of A. capitellatum increase in number from the anterior extremity of the spermatozoon to the anterior part of the nuclear region and decrease thereafter until their complete disappearance in the posterior extremity.…”

Ultrastructure of the male gamete of Brachylecithum eliomydis (Digenea, Dicrocoeliidae)—A parasite of Eliomys quercinus (Rodentia, Gliridae)

“…This is the case of the faustulid Pronoprymna ventricosa (Quilichini et al, 2007a), the hemiurids L. excisum and P. merus (Ndiaye et al, 2012a(Ndiaye et al, , 2013 and the lecithasterid A. laguncula (Quilichini et al, 2010a). Moreover, the absence of cortical microtubules was reported in the mature spermatozoon of schistosomes and some didymozoids (Justine and Mattei, 1984a;Justine et al, 1993;Pamplona-Basilio et al, 2001).…”