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Order - Sirenia (Sirenians)

Order - Sirenia (Sirenians)

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Order - Sirenia (Sirenians)

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  1. Order - Sirenia (Sirenians) Manatees, dugong, sea cows, and mermaids - • Front flippers/ no rear • Swim with up and down tail motion

  2. Wrinkled skin with little hair • Padded with blubber • Only strict vegetarian of marine mammals Stellar Sea Cow- (10 tons) were extinct 1768- reproduce slowly- 1 calf every 3 years

  3. Marine mammal act of 1972- protects sale of marine mammal products

  4. Kingdom- Animalia Phylum- Chordota Class- Mammalia Order- Cetacea

  5. The Cetaceans (whales, dolphins, and porpoises): • Of all marine mammals- Whales made the most complete transition to aquatic life (entire life in water) • They include the largest animal that has ever lived, the blue whale,

  6. the highly intelligent and communicative dolphins;

  7. the tusked narwhals and blind river dolphins

  8. and singing humpback whales-nearly 80 living species in all.

  9. Body- fish like- (convergent evolution) similar life style

  10. Not fish like- breathe air, endotherms have hair and produce milk • Elongated skull allows nostrils on top-Blowhole

  11. Forelimbs are specialized to form flippers

  12. Rear flippers- present in embryo stage, but not in adult stage. Hind limbs and pelvis are extremely small do not normally extend out of the body wall.

  13. Fetus of a white sided dolphin

  14. Dorsal fin in many

  15. Tail with two finlike flukes arranged horizontally.

  16. Cetaceans are divided into 2 groups: Toothless- baleen whales - Mysticeti Ex. Humpback and Blue whales Toothed- Carnivorous whales - Odontoceti Ex. Orca, Sperm Whales, Dolphins, and Porpoises

  17. Baleen Whales

  18. Toothed Whales

  19. Baleen Whales • Baleen whales, instead of teeth have rows of flexible, fibrous plates that hang from the upper jaw. Made of material like hair and nails. The whale feeds by taking big gulp of H2O and squeezing out through baleen, licks food off inside.

  20. Some Baleen whales have ventral pleats to increase size of mouth

  21. Some like humpbacks, are known for complex songs but do not use singing for echolocation • Baleens- have 2 blowholes • Baleen whales are the largest animal on earth

  22. Rorquals Rorquals- Baleen whales with ventral pleats like the Blue, Fin, Minke, Sei and Humpback Whales Minke Whale

  23. Toothed Whales Toothed whales- dolphins, porpoises, sperm whales, killer whale (Orca)

  24. Odontocetes ( toothed whales) • Bear teeth typically numerous peg like teeth, sometimes modified like the single tusk of the Narwhal.

  25. Male Narwhals have two teeth, the left one becomes the tusk that protrudes through the upper jaw.

  26. Odontocetes ( toothed whales) • Sperm whales- accumulate undigested squid beaks and debris called ambergris (used in fine perfume) • Dolphins- have distinctive beak or snout and travel in pods

  27. Whales are long-lived, slow reproducing- which is why whaling is threatening their populations.

  28. Whale - spout or blow- exhale through blowhole.

  29. spout or blow

  30. spout or blow

  31. Breach

  32. Breach Right Whale

  33. Breach Orca Humpback

  34. Whale Behavior carrying companion injured member of pod spying

  35. Beluga