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prehistoric mammal
Prehistoric mammals are groups of mammals that became extinct before humans developed writing. 164 million years ago, in the Jurassic period, ''Castorocauda lutrasimilis'', a mammaliaform (mammal-shaped) animal weighing about 500 grams (1.1 lb), had a full mammalian pelt, with guard hairs and underfur, webbed feet, and scales on the tail like a modern beaver, as well as teeth specialized for catching fish.
Later, about 130 million years ago in the Cretaceous, there existed larger mammals; a fossil of ''Repenomamus giganticus'' indicates that the animal was about long. In the stomach of a smaller cousin, ''Repenomamus robustus'' at , the remains of a juvenile dinosaur have been preserved.
The lineages of many varieties continued through the Cenozoic era where some reached very large sizes. Most of the very large mammals became extinct in the last ice age, but have smaller descendants.
==List of prehistoric mammals==
(詳細はAepycamelus
* African wolf
* Amebelodon
* American cheetah
* American camel
* American lion
* American zebra
* ''Anancus''
* Ancient bison
* ''Andrewsarchus''
* ''Archaeobelodon''
* ''Arsinoitherium''
* Aztlan rabbit
* ''Barylambda''
* ''Barytherium''
* ''Basilosaurus''
* Beringian cave lion
* Bone-crushing dog
* ''Brontotherium''
* ''Castorocauda lutrasimilis''
* ''Camelus moreli''
* Cave bear
* Cave lion
* Chalicothere
* ''Chalicotherium''
* ''Coryphodon''
* ''Deinotherium
* Diminutive pronghorn
* ''Diprotodon''
* Dire wolf
* ''Doedicurus''
* ''Dorudon
* Dwarf elephant
* Dwarf thylacine''
* ''Elasmotherium''
* ''Embolotherium''
* Entelodont
* ''Eobasileus''
* European jaguar
* European hippopotamus
* ''Godinotia''
* Four-tusked elephant
* Giant orangutan
* Giant koala
* Giant swimming sloth
* Giant long-horned buffalo
* Giant vampire bat
* Giant beaver
* Giant killer whale
* Giant warthog
* Giraffe camel
* ''Glyptodon''
* ''Gomphotherium''
* High Arctic camel
* Hypselephas
* ''Hyracotherium''
* ''Indricotherium/Baluchitherium/Paraceratherium''
* Irish elk
* ''Kennalestes''
* Japanese dwarf elephant
* Harrison's whale
* ''Hyaenodon''
* ''Juxia''
* ''Macrauchenia''
* Mammoths
*
* Columbian mammoth
*
* Woolly mammoth
*
* Pygmy mammoth
*
* Imperial mammoth
*
* African mammoth
* Marsupial lion
* Mastodons
*
* American mastodon
*
* ''Palaeomastodon''
*
* ''Sinomastodon''
* ''Megafaunal wolf''
* ''Megaloceros''
* ''Megalocnus''
* ''Megatherium''
* ''Meninatherium''
* ''Menodus''
* ''Mesonyx''
* ''Metamynodon''
* ''Moeritherium''
* ''Morganucodon''
* North American camel
* North American llama
* Raccoon panda
* ''Pakicetus''
* ''Paratetralophodon''
* ''Phenacodus''
* ''Phiomia''
* ''Planetetherium''
* ''Plesiadapis''
* ''Platybelodon''
* ''Primelephas''
* ''Propalaeotherium''
* ''Purgatorius''
* Pygmy giant panda
* ''Repenomamus giganticus'' and ''r.robustus''〔http://www.newscientist.com/channel/life/mg18825315.800.html;jsessionid=IPLHBBKJNEMG〕
* ''Rhynchotherium''
* Rinston's bottlenose dolphin
* Saber-toothed cats
*
* ''Smilodon''
* ''Samotherium''
* ''Sivatherium''
* Shark-toothed dolphin
* ''Stegodon''
* Stubby-tusked narwhal
* ''Synthetoceras''
* ''Teleoceras''
* ''Tetrabelodon''
* ''Tetralophodon''
* ''Thylacosmilus''
* ''Toxodon''
* ''Trilophodon''
* ''Uintatherium''
* Walrus whale
* Wilmington's ground sloth
* Woolly rhinoceros
* ''Zygolophodon''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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