Insect

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Insect anatomy
A- Head B- Thorax C- Abdomen
1. antenna – 2. ocelli (lower) – 3. ocelli (upper) – 4. compound eye – 5. brain (cerebral ganglia) – 6. prothorax – 7. dorsal artery – 8. tracheal tubes (trunk with spiracle) – 9. mesothorax – 10. metathorax – 11. first wing – 12. second wing – 13. mid-gut (stomach) – 14. heart – 15. ovary – 16. hind-gut (intestine, rectum & anus) – 17. anus – 18. vagina – 19. nerve chord (abdominal ganglia) – 20. Malpighian tubes – 21. pillow – 22. claws – 23. tarsus – 24. tibia – 25. femur – 26. trochanter – 27. fore-gut (crop, gizzard) – 28. thoracic ganglion – 29. coxa – 30. salivary gland – 31. subesophageal ganglion – 32. mouthparts

Insects are invertebrate animals of the Class Insecta, the largest and (on land) most widely distributed taxon within the Phylum Arthropoda. Insects comprise the most diverse group of animals on the earth, with over 800,000 species described—more than all other animal groups combined: "Indeed, in no one of her works has Nature more fully displayed her exhaustless ingenuity," Pliny exclaimed. Insects may be found in nearly all environments on the planet, although only a small number of species have adapted to life in the oceans where crustaceans tend to predominate. There are approximately 5,000 dragonfly species, 2,000 praying mantis, 20,000 grasshopper, 170,000 butterfly and moth, 120,000 fly, 82,000 true bug, 350,000 beetle, and 110,000 bee and ant species. The study of insects is called entomology.

Source: wikipedia, under GFDL

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