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The body of an adult butterfly or moth (the imago) has three distinct divisions, called tagmata, connected at constrictions; these tagmata are the head, thorax, and abdomen. Adult lepidopterans have four wings – a forewing and a hindwing on both the left and the right side of the thorax – and, like all insects, three pairs of legs. [11]
To restore the insect to its original vertical position, the average upward force during the downward stroke, F av, must be equal to twice the weight of the insect. Note that since the upward force on the insect body is applied only for half the time, the average upward force on the insect is simply its weight. [14]
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The terminalia of adult female insects include internal structures for receiving the male copulatory organ and his spermatozoa and external structures used for oviposition (egg-laying; section 5.8). Segments 8 and 9 bear the genitalia; segment 10 is visible as a complete segment in many "lower" insects but always lacks appendages.
Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces. [1] Archimedes' principle is a law of physics fundamental to fluid mechanics .
Gerridae are territorial insects and make this known by their vibration patterns. Both female and male adult Gerridae hold separate territories, though usually the male territories are larger than the female. [14] During the mating season, gerrids will emit warning vibrations through the water and defend both their territory and the female in it.
Adult froghoppers jump from plant to plant; some species can jump up to 70 cm (28 in) vertically: a more impressive performance relative to body weight than fleas. The froghopper can accelerate at 4,000 m/s 2 (13,000 ft/s 2 ) over 2 mm (0.079 in) as it jumps (experiencing over 400 gs of acceleration). [ 8 ]
Adult owlflies are fast-flying, aerial predators, capturing and feeding on other insects in flight. [6] The larvae too are predatory, making owlflies important in maintaining a natural ecological balance and helping to control pest insects. [7] Adults of many New World species are most active at sunset, and can often be collected near lights.