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JOURNAL

JOURNAL. Joe says that all spiders are bad. Convince him that they are actually good using information you’ve learned in this unit. Please turn in: Spider Labeling/Web WKST OR Spider Lab. SUBPHYLUM UNIRAMIA. Millipedes vs. Centipedes. Class Diplopoda. Class Chilopoda. Centipedes

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JOURNAL

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  1. JOURNAL • Joe says that all spiders are bad. Convince him that they are actually good using information you’ve learned in this unit. • Please turn in: • Spider Labeling/Web WKST OR Spider Lab

  2. SUBPHYLUM UNIRAMIA

  3. Millipedes vs. Centipedes Class Diplopoda Class Chilopoda Centipedes 1 pair legs/segment About 15 body segments Flat bodies Habitat- moist areas Diet- carnivores Defense- Venomous maxilliped Bite feels like wasp sting • millipedes • 2 pairs legs/segment • 11-100 body segments • round bodies • Habitat- moist areas • Diet- herbivores • Defense- • Roll into a ball • Produce hydrogen cyanide repellant

  4. Class HexapodaInsects

  5. General Body Structure • Three body regions a. Head b. Thorax c. Abdomen • One pair antennae • Six legs

  6. Digestion/Feeding • Having different mouthparts reduces food competition among different species. • This is probably why insects are such a successful group of organisms. • Types: • Chewing- mandibles (grasshopper & most beetles)

  7. Digestion/Feeding • Siphoning- tube for sucking (butterfly) • Piercing & sucking- cut thru skin or plants (mosquito, assassin bug) • Sponging- absorbing food (fly)

  8. Excretion • Malpighian tubules- dump wastes into intestine. • Waste- uric acid crystals to prevent water loss.

  9. Circulation • Open • Has heart that pumps blood into the hemocoel (body cavity) and ostia suck blood back up • Not used in gas exchange • Distributes nutrients, hormones, pheromones.

  10. Respiration • Spiracles- holes in body thru which air enters • Tracheal tubes- extend length of body for distribution & exchange of gases.

  11. Thermoregulation • Thermoregulation- control of body temperature • Ectothermic- organisms that cannot control their own body temperature • Bodies must warm up before able to fly.

  12. Nervous/Sensory System • Compound eyes • Some images • Color (UV light) • Shape • Movement • Some have simple eyes-ocelli

  13. What it actually sees… What an insect is looking at… Compound eye under the microscope.

  14. Nervous/Sensory System • Some can detect odors- flies, bees • Tympanic membrane- • Amplify or detect sound • Located on legs or abdomen • Setae- hairs on legs, body, antennae • Movement • vibrations

  15. Reproduction • Dioecious • Controlled by • Population density • Temperature • Seasons • Pheromones • Auditory signals

  16. 3. Females may use ovipositer to deposit eggs in soil, tree, leaf, etc.

  17. External Anatomy of insect • Abdomen • Thorax • Head • Mandible • Antennae • Compound eye • Hemi-elytra (partial outer wing) • Hind wing (for flight) • Abdominal spiracles • Jumping leg • Tympanic membrane • Thoracic spiracles • Pronotum- covers thorax • Ovipositor 14

  18. Elytra-forwing Hindwing- flight Beetles have hard outer wing- elytra- that protects membranous hindwing- for flight

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