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Biology  Chapter 28 Section 2[1]
 

Biology Chapter 28 Section 2[1]

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    Biology  Chapter 28 Section 2[1] Biology Chapter 28 Section 2[1] Presentation Transcript

    • Biology: Chapter 28 Section 2: Groups of Arthropods By: Adam Goetsch Period 3 3/29/09
    • Crustaceans
      • Crustaceans are in the subphylum Crustacea
      • They typically have two pairs of antennae, two or three body sections, and chewing mouthparts called mandibles .
      • Body plan:
      • Cephalothorax - formed by fusion of the head with the thorax
      • Thorax –lie behind the head and houses most of internal organs
      • Abdomen – the posterior part of the body
      • Carapace – part of the exoskeleton that covers the cephalothorax
    • Crustaceans (continued)
      • Body plan (continued):
      • Mandibles – a mouthpart adapted for biting and grinding food.
      • Gills attached to the appendages associated with the cephalothorax
      • Chelipeds – bear large claws that are modified to catch, pick up, crush, and cut food (behind the claws are four pairs walking legs).
      • Swimmerets - are flipper-like appendages used for swimming
    •  
    • Spiders and Their Relatives
      • Horseshoe crabs, spiders, ticks, and scorpions are members of the subphylum Chelicerata .
      • Chelicerates have mouthparts called chelicerae and two body sections, and nearly all have four pairs of walking legs .
      • Body plan:
      • Chelicerae- mouthpart that contains fangs and are used to stab and paralyze prey
      • Pedipalps- longer than the chelicerae and are usually modified to grab prey
    • Horseshoe Crabs
      • Are the oldest living arthropods
      • First appeared 600 million years ago that haven’t evolved much
      • Closest relatives are spiders, but heavily armored bodies like crabs
      • Has long tail used for movement
      • Get as big and shape of a large frying pan
    •  
    • Spiders
      • Feeding: from small birds to other arthropods, some use webs and others stalk and pounce.
      • Spiders can’t swallow unless food is liquefied and they inject their prey with paralyzing venom.
      • When paralyzed the spider then injects digestive enzymes that break down tissues the prey’s tissues.
    •  
    • Mites and Ticks
      • They are often parasites.
      • Chelicerae and Pedipalps are meant for digging into the host’s tissues and sucking out their blood or plant fluids
      • Pedipalps are often used to attach to the host.
      • Example of Mites: kill houseplants and major agricultural crops like cotton
      • Example of Ticks: bring serious diseases such as Rocky Mountain spotted fever or Lyme disease.
    •  
    • Scorpions
      • Habitat: warm area such as deserts.
      • Have long segmented abdomens that carries a venomous stinger that can kill or paralyze prey.
      • Scorpions chew prey unlike spiders.
    •  
    • Insects and Their Relatives
      • Belong to the subphylum Uniramia
      • Examples of Uniramia: centipedes, millipedes, and insects
      • Uniramians have jaws, one pair of antennae and unbranched appendages
      • Centipedes: worm- like bodies with 100 pairs of legs, class of chilopoda
      • Millipedes: worm- like bodies with double the pairs of legs and body segments then the centipedes
    •