Covering Insects 6rm:
Insects belong to the phylum Arthropoda and bare a number of characteristics with other ar-iropods. Like lobsters, spiders, ticks, and other rthropods, insects are characterized by jointed 5gs and other appendages, a segmented body, nd a tough body covering insects 6rm that serves as the nimal's skeleton. Unlike other arthropods, adult isects never have more than three pairs of legs, sually have two pairs of wings, and have a body lat is divided into three distinct parts: a head, thorax, and an abdomen. Arising from these asic body divisions are the various appendages.
The appendages arising from the head are the antennae and the mouthparts, and those arising from the thorax are the legs. It is believed that the primitive ancestors of insects had one pair of appendages on each abdominal segment, and a few living insects, such as the bristletails, still have many abdominal appendages. Most other living insects, however, do not have true append¬ages on the abdomen but have modified append¬ages that are the external genital organs and the cerci, structures that serve as touch receptors. The wings of insects are not appendages but are outgrowths of the body covering insects 6rm, or cuticle.Some insects are also valued for the useful iroducts they provide. Honey and beeswax are •reduced by honeybees, and silk is produced by ilkworms, the larvae of an Oriental moth. Both hese insects are said to be almost entirely domes-icated since they have almost ceased to exist in he wild state. Another insect product is lac, yhich is obtained from the scales covering insects 6rm the emales of certain Oriental scale insects. It is ometimes used in making shellac. Cochineal, a ed dye, is obtained from a Mexican scale insect.
See Also All Insects:
Insects vary greatly in size and shape. The small insectsest insects are the tiny fairy flies, which are less than Ymo of an inch (0.025 mm) long and develop inside the eggs of other insects. The largest living insects are the stick insects,which may be 10 inches (25.4 cm) long, and the giant moths, which have a wingspan of 10 inches. Some insects, such as the walking stick, have greatly elongated bodies. Other insects, such as many of the beetles, have flattened and rounded bodies.INSECT, any of numerous small insects invertebrate ani¬mals that make up the class Insecta. There are nearly 1 million different species of insects, more than the combined number of all insects other animal and plant species. On the North American continent alone there are more than 80,000 dif¬ferent species of insects. Insects are also the most widespread of all insects animals, inhabiting practicall insectsy every type of environment, from the edges of frozen ice fields and glaciers to hot tropical forests. They in¬habit swamps, deserts, lakes, high mountaintops, and seashores. Many insects are carried high into the air, and one or two species are found in the open ocean. Some insects live in or on other animals, including other insects.
On The Other Hand See Insects Cryptogamous:
Hence we must con¬clude that each -lofty mountain top is a habitat by itself, entirely cut off from neighboring peaks where duplicates of its fauna and flora may be collected. On the tops of Mount Washington, in the White Mountains and Mount Marcy, in the Adirondacks, are insects cryptogamous and cryptogamous plants which do not occur anywhere between these isolated fragments of polar climate and the arctic circle, where the same butterflies, spiders and lichens are widespread and indigenous.Control over insect and disease depredation is a complex process and is often localized to specific outbreaks. Ordinarily, both insects cryptogamous and diseases are endemic to specific kinds or areas of forest. Insect populations build to serious pro¬portions when disease or natural predators-birds or other insects cryptogamous—fail to keep local insects cryptogamous in check or when new insects cryptogamous are introduced into the area.
