Abstract
The ancyrocephaline monogenean gill parasite Cichlidogyrus halli typicus has a short oviduct/ovo-vitelline duct separated from the germarium and from the ootype by sphincter muscles. The chamber so-formed contains spermatozoa, the axonemal ends of which appear to be attached in an intimate way between lamellated extensions of the chamber lining. This arrangement may facilitate fertilization by retaining an oocyte temporarily in close contact with the free nucleated ends of the spermatozoa, i.e. the short oviduct/ovo-vitelline duct may serve as a fertilization chamber. There are two distinct types of Mehlis' gland opening at the base of the ootype and the latter has a cellular, non-secretory lining which is not penetrated by gland ducts.
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