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Ankalagon saurognathus
''Ankalagon saurognathus'' is an extinct carnivorous mammal of the family ''Mesonychidae'', endemic to North America during the Paleocene epoch (63.3—60.2 mya), existing for approximately .〔(PaleoBiology Database: ''Ankalagon saurognathus'', basic info )〕
Known from the Paleocene of New Mexico, ''Ankalagon'' is the largest mesonychid known from the Paleocene of North America, and it provides the best evidence for sexual dimorphism in mesonychids.
== Description ==
The main feature that distinguishes ''A. saurognathus'' from the ancestral ''Dissacus'' species is its size: ''Ankalagon'' grew to be as large as a bear,〔(Paleocene mammals of the world ) "Carnivores, creodonts and carnivorous ungulates: Mammals become predators" 〕 as compared to the coyote or jackal-sized species of ''Dissacus''. In fact, the only North American mesonychids that surpassed ''Ankalagon'' in size were the larger species of the Early Eocene genus, ''Pachyaena'', such as ''P. gigantea'' and ''P. ossifraga'', which, too, grew to the size of bears.〔
Evidence of sexual dimorphism comes from the fact that some jawbones were larger, and had more massive molar teeth better suited to crushing bones than other jawbones, suggesting that the males crushed bones.〔
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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