Abstract
External genital organs and genital suckers of Tyrophagus dimidiatus were studied by using the scanning electron microscope.The female has two genital openings, one is the gonopore and the other is the copulatory orifice. The copulatory opening is situated behind the anus, which measured about 5μ in diameter. Near the opening there are several short spines measuring about 0.5μ in length. The male has a penis. It is S-shaped, and is measured about 25μ in length. The tip of the penis measures about 1μ in diameter and the elliptical base has diameters of about 5×10μ.Both sexes have two pairs of genital suckers, which are found near the external genital organ. They are not used for copulation, when the internal pressure of the body fluid is raised, in males, the tips of these organs may be extended on both sides of the genital organ.
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