| ultrastructure of sperm and spermatogenesis of rugogaster hydrolagi, schell 1973 (platyhelminthes, trematoda, aspidogastrea, rugogastridae). | mature sperm of rugogaster hydrolagi exhibit the structure typical of trematoda, with 2 axonemes of the 9+ "1" pattern being incorporated into the sperm body, dorsal and ventral microtubules occurring in the principal region that contains the nucleus and mitochondrion, and a complete row of peripheral microtubules lying in the proximal region surrounding the two axonemes. during spermiogenesis, a zone of differentiation develops that comprises a row of microtubules along the cell membrane and an ... | 1992 | 1438139 |
| vitellogenesis of basal trematode aspidogaster limacoides(aspidogastrea: aspidogastridae). | the vitellogenesis of the trematode aspidogaster limacoides (aspidogastrea: aspidogastridae), a parasite of cyprinid fishes, is described here using transmission electron microscopy. four different stages of vitellocytes are differentiated: immature vitellocytes, early maturing vitellocytes, advanced maturing vitellocytes and mature vitellocytes. the process follows the same general pattern already described in other free-living neoophorans and parasitic flatworms (i.e. trematoda, monogenea and ... | 2010 | 20620223 |