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Research Project Class Insecta Insects are invertebrates in the class Insecta from the phylum arthopoda Arthropods include more than 850000 species and form by far the largest phylum in the animal kingdom exceeding in number all the other Phyla combined The characteristic tough exoskeleton and jointed limbs are superimposed in a segmental body plan that reflects the evolution of arthropods from ancestors of the annelid worm Insects arachnids myriapods and crustaceans are the major groups in this phylum Nichols Insects are the largest of this phylum and make up the largest class of all organisms and are recognized by taxonomist to have nearly one million recognized species It is estimated that their are over ten million species still undiscovered Because of this the insect orders are thought to be the least well known Most of which are beetles and insects in tropical areas Insects are part of 28 living orders which all have three body sections head thorax abdomen and six legs and a pair of antenas They are split in to two groups Apterygota and Pterygota Pterygota can fly while the more primitive Apterygota cannot Gale Group Insects are all over the world from the Tropics to the Tundras They extremely diverse While the order Grylloblattodea order of the Orthopteroid Orders thrives in cold icy places the Mecoptera Order of the Hemipteroid Orders does best in the tropical areas of the world Every Class is different and includes many kinds of insects So here is the major 23 Orders Order Microcoryphia which include Bristletails are part of the subclass Apterygota Bristletails are jumping insects with long antennae that are wingless with very large eyes a biting mouth and three very fine tails They live among stones or in woods and grass and feed mostly on algae Order Zygentoma is also part of the subclass Apterygota and include Silverfish and fibrebrats Silverfish are wingless with small eyes a chewing mouth they have
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