Ultrastructure of male gametes in Cerataulina compacta

The spermatogenesis of Cerataulina compacta was that the spermatocytes first produced biflagellate cells through miosis and then the biflagellate cells divided into uniflagellate sperms.The flagellar apparatus included flagellar axoneme and basal body.The axoneme consisted of 9 doublet microtubules, lacking central tubules,which was “9+0” frib pattern, paraxial swellings were found in axoneme,their structures were not clear.The basal body attached to nucleus contained 9 doublet microtubules,which were extended from axoneme, and a central structure to construct a “wheel”pattern, it was a focus of microtubules,possibly functioning as a centriole.Within axoneme and basal body there was a basal plate.The composition and structure of organella in spermatocytes、biflagellate cells and sperms was similar to those in vegetative cells,no Golgi body was found in the sexual cells, but containing high electon dense bodies. [WT5F1]