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The globular part is covered with spines, which may help in retaining the male and female in copula.
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These alternate males are incapable of flight and lack the air-filled abdominal bladder used in long-range acoustic communication; but may be found in copula with mature females in the field.
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the argument for the existence of an 'atemporal copula', adequately performs this task; but is rejected by Albert.
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However, sterile males require at least a day longer to mature (day 4 instead of day 3) and remained in copula for longer period but they become aspermic at the same rate as fertile males.
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Sources of variability in copula duration of Mediterranean Fruit Flies
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