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ARTHROPODS

ARTHROPODS. Three Important characteristics. Jointed appendages Segmented bodies Chitin exoskeleton Arthro = “joint” Poda = “foot”. “Crunching” Arthropods?. Strong exoskeleton composed of chitin (type of protein) OR calcium carbonate. Nitrogen Waste….

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ARTHROPODS

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  1. ARTHROPODS

  2. Three Important characteristics • Jointed appendages • Segmented bodies • Chitin exoskeleton Arthro = “joint” Poda = “foot”

  3. “Crunching” Arthropods? • Strong exoskeleton composed of chitin (type of protein) OR calcium carbonate

  4. Nitrogen Waste… • Terrestrial: use Malpighian tubules • Aquatic: use Green Glands *Act like kidneys to filter & remove toxic nitrogen from the system

  5. Subphylum Uniramia

  6. Flies Eyes (say that 5 times fast ) • Simple Eyes: Sense light and dark (like ocelli) • Compound Eyes: Have multiple lenses (up to 2000!); can see images from multiple angles

  7. Examples… • Centipedes • Millipedes • Insects (flies, bees, ants)

  8. Can fly! • 3 pairs of walking legs • Separate individuals dependant on others for various jobs • Ex. Collecting food, defence, etc Unique Features for Movement Insect Societies

  9. Carnivores • 1 pair legs per segment • Feed on detritus • 2 pairs legs per segment Centipedes Millipedes

  10. THREE main body parts • Head • Thorax • abdomen

  11. Feeding • Thin mouth parts pierce host’s skin • Sucks blood (parasitic) • Proboscis used to sip nectar from plants Mosquito Butterfly

  12. Pheromones • Chemicals affecting behaviour/development • Can be used to indicate trail to food source

  13. Bee Dances • Shows others type, direction and distance to food • ROUND DANCE: source of food <50m from hive • WAGGLE DANCE: source of food >50m from hive

  14. subPhylumchelicerata

  15. Examples… • Spiders • Scorpions • Mites • Ticks

  16. Making silk • Glands in abdomen  liquid silk pushed through SPINNERETS

  17. Chelicerate Structures • Main body parts: Cephalothorax & Abdomen • Mouthparts: Chelicerae (adapted for different purposes) and Pedipalps (longer than chelicerae)

  18. Spiders • Hollow chelicerae • Inject VENOM into prey • Produce silk

  19. Mites & Ticks • Most parasitic • Small chelicerae pierce skin of host

  20. Scorpions • Pedipalps enlarged into CLAWS • Segmented abdomen has venomous barb at tip

  21. Subphylum crustacea

  22. Examples… • Pill bugs • Crayfish • Lobster • Crab

  23. Body parts • Exoskeleton (made of chitin) • 2 pairs of antennae • Mandibles (mouthparts)

  24. Antennae • “Feelers” to detect movement using sensory hairs • Some are adapted for feeding

  25. Features on Abdomen • Feathery “gills (filter feeding) • Large claws • Walking legs or swimmerets • Paddle like tail

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