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Squalodon
''Squalodon'' is an extinct genus of whales, belonging to the family Squalodontidae. Named by Jean-Pierre Sylvestre de Grateloup in 1840,〔Grateloup, ''Description d'un fragment de mâchoire fossile, d'un genre nouveau de reptile (Saurien), de taille gigantesque, voisin de l'Iguanodon...'', Bordeaux 1840.〕 it was originally believed to be an iguanodontid dinosaur but has since been reclassified. The name ''Squalodon'' comes from ''Squalus'', a genus of shark. As a result, its name means "shark tooth."
== Description ==
Squalodontids are odontocetes that lived during the early-middle Oligocene into the middle Miocene, about 33 to 14 million years ago. The genus ''Squalodon'' belongs to the order Odontoceti, the toothed whales. They are named after the shark ''Squalus'' because their cheek teeth look like the teeth of a squalus shark. The unique-looking squalodontids were likely distributed throughout the world in warm waters during the Oligocene and Miocene. Squalodontidae went extinct in the middle of the Miocene, leaving no descendants. Hypotheses of why this family lead to extinction have to deal with competition of other groups of dolphins as well as climate change.
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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