Abstract
The testis of O. latipes is composed of cysts containing germinal elements Tn various stages of spermatogenesis (Fig. 1). The simple epithelial cells of the cyst wall are the Sertoli cell (SC) homologs. When the contained germinal elements have matured, the cyst epithelium fuses with that of the terminal divisions of the efferent duct system. In the connective tissue stroma surrounding the cysts and ducts, the Leydig cell (LC) homologs are found.The LC (Fig. 2) contains a central vesicular nucleus with a distinct nucleolus. Flattened cisternae of rough ER are distributed throughout the cytoplasm; smooth ER, usual in steroidogenic cells, is not present.
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