ultrastructural studies of the spermatogenesis and spermiogenesis of the caryophyllidean cestode wenyonia virilis (woodland, 1923).spermatogenesis and spermiogenesis of the monozoic caryophyllidean cestode wenyonia virilis (woodland, 1923), an intestinal parasite of synodontis schall (pisces: siluridae), have been investigated by means of transmission electron microscopy for the first time in egypt. spermatogenesis is of a rosette type; each spermatogonium undergoes four mitotic and two meiotic divisions resulting in the formation of sixty four spermatids. these spermatids undergo spermiogenesis and transform into mature sp ...200818568447
discordant population histories of host and its parasite: a role for ecological permeability of extreme environment?biogeographical and ecological barriers strongly affect the course of micro-evolutionary processes in free living organisms. here we assess the impact of a recently emerged barrier on populations of limnic fauna. genetic diversity and population structure in a host-parasite system (wenyonia virilis tapeworm, synodontis schall catfish) are analyzed in the recently divided turkana and nile basins. the two basins, were repeatedly connected during the holocene wet/dry climatic oscillations, followin ...201728394904
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