Abstract
The spermatheca of the thrips Frankliniella occidentalis (Thysanoptera: Thripidae) is a small brownish-orange organ that adheres to the vagina; the accessory gland is a large structure with an apical bulb and a long duct opening into the vagina separately from the spermatheca. Both organs consist of an epithelium with secretory and duct-forming cells. A dense secretion fills the apical bulb of the accessory gland. The long duct has an epithelium lined by an annular cuticular intima; the spermatheca has duct-forming cells, unexpectedly rich in inclusions that possibly contain pigment. These cells also form the first short part of the spermathecal duct, which is continuous with the part formed by a diverticulum of the vaginal epithelium. This epithelium provides anchorage for the muscle fibers controlling the opening of the duct lumen.
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