Abstract
The vas deferens, seminal vesicle, penis and common genital atrium of the monogenean, Diclidophora merlangi are lined by a very flat, lamellate epithelium. The structure is apparently syncytical, although nuclei or perikaryons have not been observed. The epithelium extends to just inside the gonopore where a septate desmosome marks the union with body tegument. There is minor regional variation in structure. The terminal portion of the seminal vesicle and the penis lumen are lined in part by the luminal cytoplasm of the prostate gland which surrounds this part of the reproductive tract. The prostate gland cells are synthetically active and produce a characteristic secretory body that is released either singly by exocytosis, involving membrane fusion, or in bulk via apocrine secretion. The secretion is acidophilic, PAS-positive and reactive for protein. The penis is sucker-like in structure and armed with a ring of 16 genital hooklets. Cilia have not been observed in any part of the male reproductive tract, and sense receptors are not apparent in the tegument surrounding the gonopore.
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