hemipenes

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hemipenes

paired, vascular, eversible sacs which open into the posterior cloaca in snakes and lizards. The two hemipenes are brought together to act as a penis and are inserted into the cloaca of the female during copulation.
References in periodicals archive ?
We recorded sex of individuals if possible based on external morphological characteristics or cloacal probing for the presence or absence of a hemipenis.
Snakes were weighed to the nearest 1 g with a digital balance and sex was determined by everting the hemipenis or visual inspection.