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Order Cetacea & Sirenia Classification and Characteristics

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Presentation on theme: "Order Cetacea & Sirenia Classification and Characteristics"— Presentation transcript:

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

2 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 Order Cetacea & Sirenia

3 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 Flukes are used for propulsion Order Cetacea & Sirenia

4 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 Order Cetacea & Sirenia

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

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

7 Mysticeti Feeding Types
Order Cetacea & Sirenia

8 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 Order Cetacea & Sirenia

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

10 Killer Whale Orcinus orca is common in cold water, worldwide
Two distinct groups of killer whales Piscivores Marine mammal carnivores Order Cetacea & Sirenia

11 Dolphins & Porpoises Dolphins Porpoises Falcate dorsal fin
Conical teeth Distinct beak Porpoises Triangular dorsal fin Spade shaped teeth Lack a beak Order Cetacea & Sirenia

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

13 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. Order Cetacea & Sirenia

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