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Reasons for the dominance of insects over other animals
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BENEFICIAL AND HARMFUL EFFECTS OF INSECTS
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Learn Introductory Entomology with Rahul
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Body Segmentation of Insect

  • Insects have segmented bodies with certain segments fusing to form three usually well-defined regions: head, thorax, and abdomen.
  • The grouping of segments into functional regions is known as tagmosis.
  • The head consists of 6 segments. The head comprises mouthparts, compound eyes, simple eyes (ocelli), and a pair of antennae.
  • Thorax consists of 3 segments i.e. prothorax, mesothorax, and metathorax, Meso, and metathorax are together known as pneumothorax.
  • All three thoracic segments possess a pair of legs and meso and meta-thorax each possess one pair of wings.
  • The abdomen has 7-11 segments with genital appendages. The 8 and 9 segments in female and 8 segments in male insects are modified to bear genital appendices.
  • There are hard, color,d, and complex plates in each segment of the insect body which is called sclerites.
  • The sclerites present on the dorsal side are called tergites, the  Lateral side is called pleurites and the Ventral side is called sternites.
  • Segments except in the head (6 segments fused to form a capsule) joined together with a flexible soft and white membrane called inter-segmental membrane.
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