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Phylum Arthropoda

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Title: Phylum Arthropoda Author: 232718 Last modified by: 232718 Created Date: 5/9/2011 11:50:33 AM Document presentation format: On-screen Show Company – PowerPoint PPT presentation

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Title: Phylum Arthropoda


1
Phylum Arthropoda
  • Crustaceans, Insects, Arachnids

2
Phylum Arthropoda Jointed Legs
  • General Characteristics
  • Jointed appendages (legs, maxillipeds, antenna)
  • Chitinous exoskeleton
  • Advantages protection and muscle attachments
  • Disadvantages heavy, limits mobility (slow),
    molt (shed) in order to grow
  • Open Circulatory System not as efficient as
    closed system. The blood is pumped from the
    heart out to the tissues where it washes over
    them, then eventually flows back to the heart

3
  • Well developed nervous system
  • Brain and ventral nerve cord
  • Compound eyes (multiple lenses) and some have
    simple eyes (one lens)
  • Hairs for touch, balance organs in the antenna,
    chemoreceptors (smell / taste)
  • Endocrine System
  • Hormones control molting and reproduction

4
Major Types of Arthropods
  • Subphylum Uniramia Body in three parts (Head,
    Thorax, Abdomen)
  • Class Insecta Largest class (most species) of
    arthropods (ants, bees, beetles, etc.) Three
    pairs of legs and two antenna
  • Class Chilopoda Centipedes, one pair of legs
    per segment, usually carnivores
  • Class Diplopoda Millipedes, two pairs of legs
    per segment, usually herbivores

5
  • Subphylum Chelicerata body in two parts
    (cephalothorax, abdomen), no antennae
  • Class Arachnida four pairs of legs (spiders,
    mites, ticks, and scorpions)
  • Class Pycnogonida Sea Spiders
  • Class Merostomata Horseshoe Crabs
  • Only living members of their class (living
    fossil)
  • More closely related to spiders than to crabs
  • Contain Book Lungs gills that are arranged in
    flaps like pages of a book that are covered so
    they can exit the water to reproduce

6
  • Subphylum Crustacea
  • Class Branchiopoda primitive, gills on their
    feet (ex. Daphnia)
  • Class Copepeda small crustaceans (ex. Copepods,
    plankton from spongebob)
  • Class Cirripeda sessile, shelled, legs kick in
    the water to capture food (ex. Barnacles)
  • Class Malacostraca 75 of all crustaceans are
    in this class
  • Order Euphausiacea Krill (shrimp-like)
  • Order Decapoda 10 walking legs, cephalothorax
    and abdomen
  • Crabs, shrimp, lobsters, crayfish
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