one of the paired grooved copulatory organs found in male lizards and snakes which can be everted (extruded by turning inside out) when mating or when pressure is applied
on of a pair of copulatory organs present in male snakes.
one of a pair of male sexual organs heterogeneous the reference to scales that are different in size and shape homogeneous referring to scales that are similar in shape and size
A hemipenis (plural hemipenes) is one of a pair of reproductive organs of male squamata (snakes, lizards and amphisbaenia). Hemipenes are usually held inverted, within the body, and are everted for reproduction via erectile tissue like that in the human penis. Only one is used at a time, and some evidence indicates males alternate use between copulations.