The Princeton Field Guide to Prehistoric Mammals

Donald R. Prothero is research associate in vertebrate paleontology at the Natural History Museum of Los Angeles County and professor emeritus of geology at Occidental College. His many books include Greenhouse of the Dinosaurs: Evolution, Extinction, and the Future of Our Planet, Evolution: What the Fossils Say and Why It Matters, and After the Dinosaurs: The Age of Mammals.

Preface 6 1 The Age of Mammals 7 Dating Rocks 8 Clocks in Rocks 10 What's in a Name? 11 How Do We Classify Animals? 12 Bones vs Molecules 15 Bones and Teeth 15 2 The Origin and Early Evolution of Mammals 20 Synapsids (Protomammals or Stem Mammals) 20 Mammals in the Age of Dinosaurs 23 Morganucodonts 23 Docodonts 25 Monotremes (Platypus and Echidna) and Their Relatives 27 Multituberculates 30 Triconodonts 31 Theria 34 3 Marsupials: Pouched Mammals 37 Marsupial vs Placental 37 Marsupial Evolution 38 Ameridelphia 39 Australiadelphia 41 4 Placental Mammals (Eutheria) 47 The Interrelationships of Placentals 50 5 Xenarthra: Sloths, Anteaters, and Armadillos 51 Edentate vs Xenarthran 51 Order Cingulata (Armadillos) 53 Order Pilosa (Anteaters and Sloths) 55 6 Afrotheria: Elephants, Hyraxes, Sea Cows, Aardvarks, and Their Relatives 58 Tethytheres and Afrotheres 58 Order Proboscidea (Elephants, Mammoths, Mastodonts, and Their Relatives) 60 Order Sirenia (Manatees and Dugongs, or Sea Cows) 67 Order Embrithopoda (Arsinoitheres) 72 Order Desmostylia (Desmostylians) 73 Order Hyracoidea (Hyraxes) 75 Order Tubulidentata (Aardvarks) 77 Order Macroscelidia (Elephant Shrews) 78 Order Afrosoricida 79 7 Euarchontoglires: Euarchonta Primates, Tree Shrews, and Colugos 80 Archontans 80 Order Scandentia (Tree Shrews) 82 Order Dermoptera (Colugos, or Flying Lemurs) 82 Order Plesiadapiformes (Plesiadapids) 84 Order Primates (Euprimates) 86 8 Euarchontoglires: Glires Rodents and Lagomorphs 94 Chisel Teeth 94 Order Rodentia (Rodents) 95 Order Lagomorpha (Rabbits, Hares, and Pikas) 101 9 Laurasiatheria: Insectivores Order Eulipotyphla and Other Insectivorous Mammals 103 Order Eulipotyphla 103 Extinct Insectivorous Groups 107 10 Laurasiatheria: Chiroptera Bats 112 Bat Origins 114 11 Laurasiatheria: Pholidota Pangolins, or Scaly Anteaters 117 Order Pholidota (Pangolins) 118 Palaeanodonts 120 12 Laurasiatheria: Carnivora and Creodonta Predatory Mammals 122 Carnivores, Carnivorans, and Creodonts 122 Order Creodonta 124 Order Carnivora 127 13 Laurasiatheria: Ungulata Hoofed Mammals and Their Relatives 146 Condylarths 147 14 Laurasiatheria: Artiodactyla Even-Toed Hoofed Mammals: Pigs, Hippos, Whales, Camels, Ruminants, and Their Extinct Relatives 151 Artiodactyl Origins 153 Suoid Artiodactyls 154 Whippomorpha 160 Tylopods 169 Ruminantia 175 15 Laurasiatheria: Perissodactyla Odd-Toed Hoofed Mammals: Horses, Rhinos, Tapirs, and Their Extinct Relatives 186 Equoids 187 Tapiroids 191 Rhinocerotoids 196 Brontotheres, or Titanotheres 199 16 Laurasiatheria: Meridiungulata South American Hoofed Mammals 203 Order Notoungulata (Southern Ungulates) 205 Order Pyrotheria (Fire Beasts) 206 Order Astrapotheria (Lightning Beasts) 207 Order Litopterna (Litopterns, or Smooth Heels) 207 17 Uintatheres, Pantodonts, Taeniodonts, and Tillodonts 209 Order Dinocerata (Uintatheres) 209 Order Pantodonta (Pantodonts) 212 Order Taeniodonta (Taeniodonts) 214 Order Tillodontia (Tillodonts) 216 18 Mammalian Evolution and Extinction 218 Why Were Prehistoric Mammals So Big? 218 Where Have All the Megamammals Gone? 219 How Did Mammals Diversify after the Dinosaurs Vanished? 222 What about Mass Extinctions? 228 The Future of Mammals 229 Illustration Credits 231 Further Reading 232 Index (with Pronunciation Guide for Taxonomic Names) 234