Subclass Hexapoda

Invertebrate Zoology Chapter 19 about Subclass Hexapoda (Insects)

1. SUBCLASS HEXAPODA Gotta catch ‘ em all!

2. PRE-ASSESSMENT!

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 N G P B E S

8. SUBCLASS HEXAPODA GENERALCHARACTERISTICS BY: PAULA MARIE M LLIDO

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