Lecture 13 - Field Trip 1 Aquatic Mammals 2 3 Analogous...

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1 Field Trip!!!
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2 Aquatic Mammals
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3
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4 Analogous fusiform shapes Whale skeletal structure shows their terrestrial ancestry
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6 mesonychians mesonychians hippos/pigs cetaceans hippos/pigs cetaceans other artiodactyls other artiodactyls MORPHOLOGY MOLECULES mesonychians mesonychians hippos/pigs cetaceans hippos/pigs cetaceans other artiodactyls other artiodactyls MORPHOLOGY MOLECULES
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7 Ambulocetus natans
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8 Hans Thewissen and Ambulocetus natans Archeocetes Protocetes
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9 Telescoped Heads Nostrils on top Hearing through jaw Loss of legs
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10 The oxygen isotope record shows the transition from freshwater to marine
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11
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12 Marine Mammal Summary • Mammals have returned to the sea many times and have adapted differently every time • Cetaceans are the most highly adapted of the marine mammals • The evolution of cetaceans to an aquatic lifestyle happened about 50mya in southern Asia and was very rapid • Whales have a terrestrial ancestor and their progressive adaptation can be traced through the fossil record (from mesonychians -> archeocetids -> protocetids -> modern) • The adaptive trends are toward better swimming and better Fsh catching abilities
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13 Plesiadapids, early primates (?), 65-45mya Probably derived from some kind of shrew like ancestor Modern tree shrew
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14 Northarctus a defnite early primate, 40mya Prosimians primitive living primates Tarsiers Lemurs Galagos
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15 Baboons Nasalis Colobus tamarins squirrel monkeys
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16 Fayum Depression, Egypt - earliest anthropoid primates Darwinius • Found in Messel, Germany in 2009, 47mya • Most complete fossil primate ever found – shows hair, stomach contents, sex (male) • Very near to the origins of anthropoid primates
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17 APES Gorillas Orangutans Gibbons Kamoyapithecus the earliest ape • from the Miocene of Kenya, 24mya • Agrees with molecular divergence times of apes and Old World monkeys
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18 Primate Family Tree Lemurs/ Galagos Tarsiers NW Monkeys OW Monkeys Apes Shrew-like ancestor Prosimians Anthropoids Prosimian-like ancestors Darwinius Kamoyapithecus Egyptian taxa Primate Evolution Summary • Primates evolved about 50mya from an insectivorous shrew-like ancestor
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This note was uploaded on 03/11/2010 for the course GE CLST 70B taught by Professor Morris,m.r./friscia,a.r./moldwin,m.b./vanvalkenburgh,b during the Winter '10 term at UCLA.

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Lecture 13 - Field Trip 1 Aquatic Mammals 2 3 Analogous...

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