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Insect Morphology and SystematicsInsect Morphology and SystematicsMargins and Angles
The wing is triangular in shape and has therefore three sides and three angles. The
anterior margin strengthened by the costa is called costal margin and the lateral margin is called
apical margin and the posterior margin is called anal margin. The angle by which the wing is
attached to the thorax is called humeral angle. The angle between the costal and apical margins
is called apical angle. The angle between apical and anal margins is called anal angle.
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