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Arthropods

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Chapter 28 What is an Arthropod? Phylum Arthropoda Segmented body with specialized structures Exoskeleton made of chitin Jointed appendages Bilateral symmetry All 3 ... – PowerPoint PPT presentation

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Title: Arthropods


1
Arthropods
  • Chapter 28

2
What is an Arthropod?
  • Phylum Arthropoda
  • Segmented body with specialized structures
  • Exoskeleton made of chitin
  • Jointed appendages
  • Bilateral symmetry
  • All 3 germ layers
  • 2 digestive openings
  • coelomate

3
Evolution of Arthropods
  • Natural selection, over time, has led to fewer
    body segments and specialized appendages used for
    movement, feeding, etc.

4
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5
Growth Development of Arthropods
  • Arthropods undergo periods of molting when they
    outgrow their exoskeleton
  • Molting shedding of entire exoskeleton and
    making of new one to take its place.

6
Groups of Arthropods
  • Classified based on the number and structure of
    body segments and appendages (usually mouthparts)
  • Divided into 3 major sub-phyla
  • Crustacea
  • Chelicerata
  • Uniramia

7
Crustacea
  • 2 pairs of antennae
  • 2 or 3 body segments
  • Chewing mouthparts (mandibles)
  • Ex lobster, shrimp, crabs, barnacles

8
Chelicerata
  • Have mouthparts called chelicerae (fangs)
  • 2 body sections
  • 4 pairs of walking legs
  • Ex spiders, scorpions, ticks

9
Uniramia
  • Have jaws
  • 1 pair of antennae
  • Unbranched appendages
  • Ex centipedes, millipedes INSECTS

10
Insects
  • 3 body parts (head, thorax, abdomen)
  • 3 pairs of legs on thorax
  • Ex ants, beetles, flies, butterflies, bees,
    wasps, etc..
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