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Order Cetacea & Sirenia1 Marine Mammals Order Cetacea & Sirenia Classification and Characteristics.

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Presentation on theme: "Order Cetacea & Sirenia1 Marine Mammals Order Cetacea & Sirenia Classification and Characteristics."— Presentation transcript:

1 Order Cetacea & Sirenia1 Marine Mammals Order Cetacea & Sirenia Classification and Characteristics

2 Order Cetacea & Sirenia2 Order Cetacea Mysticeti (Baleen whales) Odontoceti (Toothed whales) Have made the most complete transition to aquatic life  Have considerable morphological and ecological variability, but all share similar characteristics Convergent evolution – different spp. develop similar structures due to a similar lifestyle

3 Order Cetacea & Sirenia3 Cetacea Characteristics Elongated telescoped skull Nostrils are on top of the head instead of in front, forming a single or double blowhole Have a pair of front flippers, but the rear limbs have disappeared oFlukes are used for propulsion

4 Order Cetacea & Sirenia4 Suborder Mysticeti Toothless or baleen whales, 11 spp. Filter feeders which use baleen Posses symmetrical dorsal skull with 2 blow holes Are the largest whales and the largest animals that ever lived on earth

5 Order Cetacea & Sirenia5 The Roqurals Includes: blue, fin, minke, and humpback Feed by gulping large schools of krill or small fish oThe lower part of the throat has grooves on the underside which distend when feeding Blue Whale

6 Order Cetacea & Sirenia6 The Right Whales Includes: Bowhead and right whales Swim at the surface with their mouths open Northern Right whale

7 Order Cetacea & Sirenia7 Mysticeti Feeding Types

8 Order Cetacea & Sirenia8 Suborder Odontoceti Includes: Sperm whales, narwhals, beaked whales, oceanic dolphins, true porpoises, and river dolphins Have teeth, adapted for a diet of squid, fish and other marine mammals Dorsally asymmetrical skull with a single blow hole More variable morphologically and ecologically

9 Order Cetacea & Sirenia9 Sperm Whale Largest of the toothed Whales on earth (Physeter catodon) oEat squid, especially from great depths oSquid beaks and other undigestibles accumulate in the gut creating ambergris

10 Order Cetacea & Sirenia10 Killer Whale Orcinus orca is common in cold water, worldwide Two distinct groups of killer whales oPiscivores oMarine mammal carnivores

11 Order Cetacea & Sirenia11 Dolphins & Porpoises Dolphins oFalcate dorsal fin oConical teeth oDistinct beak Porpoises oTriangular dorsal fin oSpade shaped teeth oLack a beak

12 Order Cetacea & Sirenia12 Order Sirenia Inhabit shallow water and feed strictly on plants oHerbivores - digestive tract is similar to horses and elephants Use a prehensile upper lip to feed Occupy tropical and subtropical waters

13 Order Cetacea & Sirenia13 Is it the Rum, or are you beautiful? Have been exploited for their meat (tastes like veal) and oil- rich blubber Reproduce slowly 1 calf ever 3 years Only four species remain, all close to extinction Dugongs – 10 ft. and 930 lb. (East Africa to some pacific islands) Manatees – 15 ft and 1,320 lb.


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