FIGURE 1: General organisation of parasitid spermatozoon (left) showing superficial and internal organization, as well as spermatozoon internal structure (right) as shown on cross sections through nuclear, postnuclear and posterior regions (based on Witali´nski 1975). Abbreviations: ca – canaliculus running in longitudinal crest, ch – chromatin, cr – longitudinally running crest, gIB – granular inclusion body, m – mitochondrion, n – nucleus, rb – subplasmalemmal longitudinal ribbon, sc – subplasmalemmal cistern, sIB – striated inclusion body