19. Class Mammalia Notes

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19. Class Mammalia Notes

  1. 1. Marine Mammals Kingdom: Animalia Phylum: Chordata Class: Mammalia Order Pinnipedia Family Phocidea Family Otariidae Family Odobenidae Order Carnivora Order Sirenia
  2. 2. Order Pinnipedia <ul><li>“ Pinnipeds” </li></ul><ul><li>Seals, sea lions, and walruses </li></ul><ul><li>Debated whether it is its own order </li></ul><ul><li>Evolved from terrestrial carnivores thus sometimes put in Order Carnivora </li></ul>
  3. 3. Order Pinnipedia <ul><li>All are carnivorous predators feeding mostly on squid and fish </li></ul><ul><li>Specialized streamlined body aids in swimming </li></ul>
  4. 4. Keeping Warm <ul><li>Thick layer of blubber acts as insulation and as a food reserve </li></ul><ul><li>Also have bristly hair to aid in warmth </li></ul>
  5. 5. Family Phocidea <ul><li>“ True or Earless Seals” </li></ul><ul><li>No external ears </li></ul><ul><li>Flippers covered in fur </li></ul><ul><li>Hind flippers cannot be turned forward under the body for use in terrestrial motion </li></ul><ul><li>Moves on land by wiggling like a catapillar </li></ul>
  6. 8. Family Otariidae <ul><li>“ Eared Seals” </li></ul><ul><li>Sea Lions and Fur Seals </li></ul><ul><li>Visible external ears </li></ul><ul><li>Flippers are hairless </li></ul><ul><li>Hind flippers can be placed under body for awkward locomotion </li></ul><ul><li>Longer front flippers </li></ul>
  7. 11. Sea Lion vs. Seal
  8. 12. Family Odobenidae <ul><li>“ Walruses” </li></ul><ul><li>Tiny external ears </li></ul><ul><li>Tusks on male and female adults </li></ul><ul><li>Flippers are hairless </li></ul><ul><li>Can turn hind flippers under body for locomotion </li></ul>
  9. 14. Order Carnivora <ul><li>Sea Otter </li></ul><ul><li>Smallest marine mammal </li></ul><ul><li>Lacks a layer of blubber </li></ul><ul><li>Stays warm by trapping air in its dense fur </li></ul>
  10. 15. Order Carnivora <ul><li>Eat ¼ their body weight every day </li></ul><ul><li>Use tools to open hard crustaceans and mollusks they eat </li></ul>
  11. 17. Order Carnivora <ul><li>Polar Bears </li></ul><ul><li>Semi-aquatic </li></ul><ul><li>Feed primarily on seals </li></ul>
  12. 18. Order Sirenia <ul><li>Includes Manatees and Dugongs </li></ul><ul><li>“ Sea Cows” </li></ul><ul><li>Closely related to elephants </li></ul><ul><li>Named after mermaids </li></ul>
  13. 21. Sirenians <ul><li>Move by moving tail up and down </li></ul><ul><li>Well-padded with blubber </li></ul><ul><li>A few scattered hairs </li></ul>
  14. 22. Sirenians <ul><li>Live in groups </li></ul><ul><li>Only strict vegetarians out of the marine mammals </li></ul><ul><li>Feed on seagrasses </li></ul><ul><li>Very low numbers as they were hunted for meat and reproduce slowly </li></ul><ul><li> Extinct Stellar’s Sea Cow </li></ul>

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