Acrosome formation and the centriolar complex in the spermatozoa of Sabella penicillum (Polychaeta): an electron microscopical study.

The acrosomal vesicle of Sabella penicillum spermatids consists of an electrondense core and a more transparent surrounding zone. During subsequent differentiation the vesicle membrane forms several invaginations in the juxtanuclear area. These invaginations later establish contact with the core. In the mature spermatozoon the spaces between the invaginations appear as electron-dense "tubules"; this is probably due to a shift of material from core to periphery. The ultrastructure of the centriolar complex is described in detail.