Ultrastructural observation on spermatocytogenesis in Taeniid cestodes.
OBJECTIVE
To study the spermatocytogenesis of taeniid cestodes at the ultrastructural leaves.


METHODS
Transmission electron microscopy.


RESULTS
The ultrastructural observation on spermatocytogenesis in Taenia solium, T. saginata and T. pisiformis were made by TEM. Two types of spermatogonia; type A and B, as well as the supporting cells surrounding the peripheral of spermatogonia are recognized. The type A spermatogonia are stem cells and the type B are mother cells which produce 16 primary spermatocytes by mitosis for 4 times with the cells unseparated. The primary spermatocytes are characterized by the ribosome masses in the cytoplasm. 32 secondary spermatocytes arranged in roselike were produced by reductive division of primary spermatocytes. The secondary spermatocytes become the spermatid quickly by short time development.


CONCLUSIONS
The dividing mode of spermatogonia in Taeniid cestodes is mitosis with cells unseparated.
Tian
X
X
Department of Parasitology, North China Coal Medical College, Tangshan, 063000.
Yuan
L
L
Li
Y
Y
Huo
X
X
Han
X
X
Xu
M
M
Lu
M
M
Dai
J
J
Dong
L
L
D000818:Animals; D003552:Cysticercus / Q000648:ultrastructure; D008297:Male; D008854:Microscopy, Electron; D013090:Spermatocytes / Q000254:growth & development / Q000648:ultrastructure*; D013093:Spermatogonia / Q000254:growth & development / Q000648:ultrastructure*; D013621:Taenia / Q000145:classification / Q000648:ultrastructure*