With elcctron nlicroscopy it is possible to rccopize and dcscribe the development of the cerltriolc adjunct during spermiogencsis of thc cockroach, Ez~blnberus posticzls, an orthopteran insect. The four stages identificd may be classified as: ( 1 ) presumptive granular stage; (2) endoplasmic reticulum associated stage; ( 3 ) ordered granular and vacuolate stage; and (4) mature stagc.
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