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Phylum Arthropoda Kingdom Animalia Phylum Arthropoda Subphylum Crustacea Class Cirripedia Class Copepoda Class Malacostrac...
Arthropods <ul><li>Largest phylum of animals </li></ul><ul><li>1 million species (some estimates say up to 20 million) </l...
General Characteristics of Arthropods <ul><li>Segmented body </li></ul><ul><li>Bilateral Symmetry </li></ul><ul><li>Jointe...
Sub Phylum Crustacea <ul><li>Includes: </li></ul><ul><ul><li>Shrimps </li></ul></ul><ul><ul><li>Crabs </li></ul></ul><ul><...
General Characteristics of Crustaceans <ul><li>Two pairs of antennae </li></ul><ul><li>Mandibles for chewing </li></ul><ul...
Molting <ul><li>To grow, arthropods must molt their exoskeleton </li></ul>
Digestion <ul><li>Smaller crustaceans are filter feeders, catching particles in bristles on their appendages </li></ul><ul...
Nervous System <ul><li>Can vary from simple ladder-like to centralized nervous systems </li></ul><ul><li>Most have compoun...
Compound Eyes <ul><li>Bundles of up to 14,000 light sensitive units grouped together </li></ul><ul><li>Some on stalks that...
Class Cirripedia <ul><li>Filter feeders </li></ul><ul><li>Attached to surfaces including living ones </li></ul><ul><li>Loo...
Class Copepoda <ul><li>Abundant and important in the role of plankton </li></ul><ul><li>Can use their antennae to swim </l...
Importance of Copepods <ul><li>Most numerous multi-cellular animals on Earth </li></ul><ul><li>Eat the tiniest plankton an...
Order Decapoda <ul><li>“ ten legs” </li></ul><ul><li>Largest crustaceans in terms of size </li></ul><ul><li>Extended carap...
Order Decapoda <ul><li>Five pairs of walking legs (pereopods) of which one is usually heavier (claws) </li></ul><ul><li>Ca...
Order Decapoda <ul><li>Shrimp and lobsters can range from scavengers to parasite removers </li></ul><ul><li>Crabs tend to ...
Order Euphausiacea <ul><li>Krill </li></ul><ul><li>Planktonic </li></ul><ul><li>Shrimp-like </li></ul><ul><li>Head fused w...
Sub Phylum Chelicerata <ul><li>Includes Horseshoe crabs, spiders, mites </li></ul><ul><li>Chelicerae are the only small ap...
Class Merostomata <ul><li>Horseshoe Crabs  </li></ul><ul><li>Not true crabs and have not evolved for millions of years </l...
Class Pycnogonida <ul><li>Sea Spiders </li></ul><ul><li>Have four or more pairs of legs </li></ul><ul><li>A large probosci...
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13. Phylum Arthropoda Notes

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Transcript of "13. Phylum Arthropoda Notes"

  1. 1. Phylum Arthropoda Kingdom Animalia Phylum Arthropoda Subphylum Crustacea Class Cirripedia Class Copepoda Class Malacostraca Order Decapoda Order Euphausiacea Subphylum Chelicerata Class Merostomata Class Pycnogonida
  2. 2. Arthropods <ul><li>Largest phylum of animals </li></ul><ul><li>1 million species (some estimates say up to 20 million) </li></ul><ul><li>Includes mainly terrestrial bugs </li></ul><ul><li>3 out of every 4 animals are arthropods </li></ul>
  3. 3. General Characteristics of Arthropods <ul><li>Segmented body </li></ul><ul><li>Bilateral Symmetry </li></ul><ul><li>Jointed appendages </li></ul><ul><li>Chitinous exoskeleton </li></ul>
  4. 4. Sub Phylum Crustacea <ul><li>Includes: </li></ul><ul><ul><li>Shrimps </li></ul></ul><ul><ul><li>Crabs </li></ul></ul><ul><ul><li>Lobsters </li></ul></ul><ul><ul><li>Barnacles </li></ul></ul><ul><ul><li>Potato Bugs (terrestrial) </li></ul></ul>
  5. 5. General Characteristics of Crustaceans <ul><li>Two pairs of antennae </li></ul><ul><li>Mandibles for chewing </li></ul><ul><li>Pair of appendages on each body segment </li></ul><ul><li>Gills for oxygen </li></ul>
  6. 6. Molting <ul><li>To grow, arthropods must molt their exoskeleton </li></ul>
  7. 7. Digestion <ul><li>Smaller crustaceans are filter feeders, catching particles in bristles on their appendages </li></ul><ul><li>Some have specialized appendages that push food towards their mouths </li></ul><ul><li>Nutrients passed to an open circulatory system </li></ul>
  8. 8. Nervous System <ul><li>Can vary from simple ladder-like to centralized nervous systems </li></ul><ul><li>Most have compound eyes </li></ul><ul><li>Keen sense of smell </li></ul><ul><li>Communicate with each other via body postures </li></ul>
  9. 9. Compound Eyes <ul><li>Bundles of up to 14,000 light sensitive units grouped together </li></ul><ul><li>Some on stalks that can be used like periscopes </li></ul>
  10. 10. Class Cirripedia <ul><li>Filter feeders </li></ul><ul><li>Attached to surfaces including living ones </li></ul><ul><li>Look like mollusks because of their shells </li></ul><ul><li>Others lack plates and are highly developed parasites </li></ul>
  11. 11. Class Copepoda <ul><li>Abundant and important in the role of plankton </li></ul><ul><li>Can use their antennae to swim </li></ul><ul><li>“ Sea Monkeys” </li></ul>
  12. 12. Importance of Copepods <ul><li>Most numerous multi-cellular animals on Earth </li></ul><ul><li>Eat the tiniest plankton and are in turned eaten by fish & krill </li></ul><ul><li>Fecal pellets shorten the nutrient cycle of the ocean </li></ul>
  13. 13. Order Decapoda <ul><li>“ ten legs” </li></ul><ul><li>Largest crustaceans in terms of size </li></ul><ul><li>Extended carapace </li></ul><ul><li>Shrimp, lobsters, and crabs </li></ul>
  14. 14. Order Decapoda <ul><li>Five pairs of walking legs (pereopods) of which one is usually heavier (claws) </li></ul><ul><li>Carapace encloses the cephlalothorax with the rest of the body being the abdomen </li></ul>
  15. 15. Order Decapoda <ul><li>Shrimp and lobsters can range from scavengers to parasite removers </li></ul><ul><li>Crabs tend to be scavengers </li></ul>
  16. 16. Order Euphausiacea <ul><li>Krill </li></ul><ul><li>Planktonic </li></ul><ul><li>Shrimp-like </li></ul><ul><li>Head fused with body pieces to form a unique carapace </li></ul><ul><li>Major food source for larger organisms (whales, seals, penguins, etc.) </li></ul>
  17. 17. Sub Phylum Chelicerata <ul><li>Includes Horseshoe crabs, spiders, mites </li></ul><ul><li>Chelicerae are the only small appendages before the mouth </li></ul><ul><li>Range from small pinchers to venomous fangs </li></ul>
  18. 18. Class Merostomata <ul><li>Horseshoe Crabs </li></ul><ul><li>Not true crabs and have not evolved for millions of years </li></ul><ul><li>Six pairs of appendages </li></ul><ul><li>No mandible jaw </li></ul><ul><li>Chelicerae, Walking Legs, four pairs of Pushing Legs </li></ul><ul><li>Telson or tail used for steering and flipping itself right side up. </li></ul>
  19. 19. Class Pycnogonida <ul><li>Sea Spiders </li></ul><ul><li>Have four or more pairs of legs </li></ul><ul><li>A large proboscis with a moth on the tip allows it to feed on soft invertebrates </li></ul><ul><li>No respiratory system as gases diffuse through body </li></ul><ul><li>Tiny muscles consist of one cell covered with connective tissue </li></ul>
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