Subclass Hexapoda
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This document provides information about Hexapoda, including: - Hexapoda is a subclass that includes insects and other arthropods. - It discusses the characteristics of Hexapoda such as their internal transport system, gas exchange via trachea, excretion via Malpighian tubules, and nervous system located in the head. - Reproduction is described including female oviposition and male fertilization.
Subclass Hexapoda
- 3. GIVE 5 SPECIES OF HEXAPODA
- 4. GIVE SOME CHARACTERISTICS OF HEXAPODA
- 5. GIVE 3 ORDERS OF HEXAPODA
- 6. WHICH OF THE FOLLOWING DO NOT BELONG TO THE GROUP?
- 7. FOR EXCRETION IN HEXAPODA M NGP B E S
- 9. INTERNAL TRANSPORT HEMAL SYSTEM Heart, accessory heart, hemocoel, and blood 9 abdominal segment, perforated by 1 to 12 pairs of segmental ostia Forward beating – head Backward beating – abdomen
- 10. Many survives subfreezing temperatures by accumulating glycerol, sorbitol, and trehalose in the blood which depress freezing point and function as anti-freeze Permitted ice crystals to form in desired body location A New Zealand insect called the Weta freezes completely solid during winter. When the temps go up, it resumes its business.
- 11. GAS EXCHANGE ATMOSPHERE – SPIRACLE – TISSUE Longitudinal tracheal trunks - branch to the heart, nerve cord, muscles and gut Closing spiracles reduces water loss and filtering prevents entry of dust and parasites Taenidia – allow trachea to expand, but prevent its collapse Tracheoles
- 12. Use tracheae to carry respiratory gasses Chitin-lined invaginations of epithelium Open to the outside via spiracles
- 13. Tracheal cuticle is shed during molting Gas movement in trachea – simple diffusion and muscular ventilation Aquatic – CLOSED TRACHEAL SYSTEM (w/o Spiracle) – air- filled trachea arise in tracheal gills (filamentous) Aquatic larvae has open tracheal system - 2 spiracles at end of breathing tube . Aquatic adults go to surface
- 14. EXCRETION Excretion by Malpighian tubules Almost all insects, some myriapods, some spiders Blind-ended tubules bathed in hemolymph Remove nitrogenous waste (e.g. uric acid), amino acids, sugars
- 15. 15 Excretion by Malpighian tubules Minerals, water resorbed at bottom of tubule and by rectal glands of hindgut waste passed out
- 16. NERVOUS SYSTEM
- 17. SENSE ORGAN Head pair of compound eyes (detect movement) several sets of simple eyes= ocelli (probably detect changes in light intensity) Mosquito compound eye
- 18. Fly tastes food by walking on it Bitterness kills: Two new studies revealed that suppressing the ability to taste food - regardless of how much is actually eaten - can increase or decrease how long fruit flies live. Bitter tastes cut the insect's life expectancy, while sweet tastes extended it Read more: http://www.dailymail.co.uk/sciencetech/article-2632862/Can-TASTE-BUDS-determine-long-youll-live-Study-finds-losing-ability-identify- foods-boost-life-expectancy.html#ixzz4Jbc4Ejyp Follow us: @MailOnline on Twitter | DailyMail on Facebook
- 19. 19 Head Antennae can be highly variable Mosquito antennae
- 20. REPRODUCTION FEMALE REPRODUCTION MALE REPRODUCTION
- 21. The larger drone bees, the males, do not have stingers. The female worker bees are the only ones that can sting, and their stinger is a modified ovipositor. The queen bee has a smooth stinger and can, if need be, sting skin-bearing creatures multiple times, but the queen does not leave the hive under normal conditions. When a honey bee stings a person, it cannot pull the barbed stinger back out. It leaves behind not only the stinger, but also part of its abdomen and digestive tract, plus muscles and nerves. This massive abdominal rupture kills the honey bee. Honey bees are the only species of bees to die after stinging