the oviducts of Crotalus viridis viridis females. Saint Girons(1962) and Fox (1963) reported the first studies of suchsperm storage in lizards in the 1960s.Evidence for sperm storage is based on the observa-tion that female fertilization occurs even when the femalesare separated from males and is related to the pres-ence of agglomerates of spermatozoa in specific regionsof the oviducts (Adams and Cooper, 1988). However, theexistence of these spermatozoa agglomerates does notguarantee sperm storage. Phagocytosis sites are observedin the reptilian oviduct where a large amount of spermato-zoa could be present. Additionally, phagocytosis occurswithin the storage sites themselves in lizards