The vasa deferentia of the male reproductive system of Calpodes ethlius (Hesperiidae, Lepidoptera)

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Abstract
The vasa deferentia of Calpodes ethlius are distinguishable into upper and lower regions, each of which consists of expanded and narrower tubular portions. The expanded region of the upper vas deferens is lined by a phagocytic epithelium while the narrower region is lined by a granular secretory epithelium. The expanded region of the lower vas deferens is a true seminal vesicle since it is always full of sperm bundles; it is lined by a nongranular secretory epithelium which extends to the junction with the duplex ejaculatoris. Distinctly different cells occur at the junctions of the three epithelia with each other. The entire vas deferens is surrounded by one or two thin muscle layers.

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