Studies on the liver fluke fasciola in Egypt: III. spermatogenesis

The spermatogenesis of the liver fluke Fasciola gigantica isolated from Egypt was studied using electron microscopy. It begins with primary spermatogonium, which undergoes 3 mitotic and 2 meiotic divisions to give rise to 32 spermatids. The microtubule organizing center [MTOC] was clearly described in the present trematode. Spermatids become morphologically transformed into spermatozoa. The spermatozoon possesses two axonemes, each of 9 + [1] pattern of microtubules and two mitochondria. Phylogenetic relationships between Fasciola and other Platyhelminthes was also discussed

Abnormal acrosomal invagination during spermiogenesis in hystricognate rodents

Se describe una invaginación anormal del acrosoma en espermátidas de roedores histricognatos. Probablemente esta anormalidad es causada por una alteración en la formación del acrosoma antes del inicio de la condensación nuclear