The genital plate is located in the abdominal region of the male and female flies, but in the males the genital plate is more prominent and used as a copulatory pad. It is also called the epandrium. The genital plate is horseshoe-shaped, and it is bent in the posterior region. It is divided into 2 parts, the heel and the toe.
Inside the arch, a pair of anal plates and a pair of primary claspersis are present. On the primary claspers, 6–19 dark spines, or bristles are present, which are very thick. Their number is species-specific. The main function of the genital plate is to hold the female to transfer the sperm into her genital organ during copulation.
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