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Bretesuchus
''Bretesuchus'' is an extinct genus of sebecosuchian mesoeucrocodylian within the family Sebecidae known from northwestern Argentina. It was a large apex predator (total length approximately 4 m). 〔http://darrennaish.files.wordpress.com/2013/01/naish-2001-geology-today-crocodilians.pdf page 73.〕
==Discovery==
Fossils of ''Bretesuchus'' have been found in the El Brete locality, from the Maíz Gordo Formation of northwestern Argentina and date back to the Thanetian stage of the late Palaeocene, about 58.7-55.8 million years ago.〔 The highly bent premaxilla shows that it lies within the suborder Sebecosuchia, a group of mostly South American terrestrial carnivorous crocodylomorphs with distinctive laterally compressed snouts.〔 ''Bretesuchus'' was originally assigned to its own family, the Bretesuchidae which was found to be the sister group of ''Sebecus''.〔 In 2007, a species of ''Sebecus'', ''S. querejazus'' from the Early Paleocene Santa Lucia Formation in Bolivia, was reclassified as a bretesuchid. It was given its own genus, ''Zulmasuchus''. However, recent phylogenetic analyses found Bretesuchidae to nest deeply within Sebecidae, and thus to be synonymous with it. ''Zulmasuchus'' was found to be closely related to ''Sebecus'', as originally had been proposed.
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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