Spermatogenesis in free living mite, Pergamasus viator Halaŝ (Parasitidae, Mesostigmata). I. Fine structure of spermatozoa.
The spermatozoa of Pergamasus viator Halaŝ. from Parasitidae family (Acarina, Mesostigmata) were studied in light and electron microscopy. The spermatozoa are motionless (in vitro) rod-shaped cells 110 mum long, in which six morphologically different zones can be distinguished: acrosomal zone, mitochondrial zone, zone of granular bodies, zone of striated bodies, nuclear zone and retronuclear zone. The acrosomal zone filled with the granular subacrosomal material contains at the top the acrosomal vesicle. Plasmalemma forms 19--21 folds running longitudinally along the spermatozoon. Within each fold there is a flattened canaliculus, and under each fold is found a stoff band. Between the stiff bands flattened cisternae are observed. Apart from the above structures the spermatozoon contains: the nucleus, striated bodies, granular bodies and mitochondria. The flagella-like structures or centrioles were not found. A possible origin and role of the structures decribed in spermatozoa of P. viator are discussed.
D000177:Acrosome / Q000648:ultrastructure; D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D006801:Humans; D002479:Inclusion Bodies / Q000648:ultrastructure; D008297:Male; D008925:Mites / Q000502:physiology / Q000648:ultrastructure*; D008928:Mitochondria / Q000648:ultrastructure; D013091:Spermatogenesis; D013094:Spermatozoa / Q000648:ultrastructure*