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Insect blood or haemolymph's main function is that of transport and it bathes the insect's body organs. Making up usually less than 25% of an insect's body weight, it transports hormones, nutrients and wastes and has a role in, osmoregulation, temperature control, immunity, storage (water, carbohydrates and fats) and skeletal function. It also ...
Like many insect body parts, including mandibles, antennae and stylets, cerci are thought to have evolved from what were legs on the primal insect form, [3] a creature that may have resembled a velvet worm, Symphylan or a centipede, worm-like with one pair of limbs for each segment behind the head or anterior tagma.
The main function of insect blood, hemolymph, is that of transport and it bathes the insect's body organs. Making up usually less than 25% of an insect's body weight, it transports hormones, nutrients and wastes and has a role in osmoregulation, temperature control, immunity, storage (water, carbohydrates and fats) and skeletal function. It ...
Adults are small (< 2 millimetres (5 ⁄ 64 in)) to medium-sized insects (- < 10 millimetres (25 ⁄ 64 in)). Larger Diptera are rare, only certain families of Diptera Mydidae and Pantophthalmidae reach 95–100 millimetres (3 + 3 ⁄ 4 –4 in) wingspan while tropical species of Tipulidae have been recorded at over 100 millimetres (4 in).
Many insects can hear, using tympanal organs, which may be on the legs or other parts of the body. Their sense of smell is via receptors, usually on the antennae and the mouthparts. Nearly all insects hatch from eggs. Insect growth is constrained by the inelastic exoskeleton, so development involves a series of molts. The immature stages often ...
A few taxa of the Trichoptera (caddisflies), which are the sister group to the Lepidoptera, have hair-like scales, but always on the wings and never on the body or other parts of the insect. [13] Caddisflies also possess caudal cerci on the abdomen, a feature absent in the Lepidoptera. [7]
The mesothorax is the segment that bears the forewings in all winged insects, though sometimes these may be reduced or modified, as in beetles or Dermaptera, in which they are sclerotized to form the elytra ("wing covers"), and the Strepsiptera, in which they are reduced to form halteres that attach to the mesonotum. [1]
The dried body of the female insect is 14–26% carminic acid. [24] Steps in the cochineal harvest in Oaxaca, public mural by Arturo Garcia Bustos, Mexico . Workers collect the female cochineal insects from their host plants. [4] The insects are killed by immersion in hot water or by exposure to sunlight, steam, or the heat of an oven.