Editing Probainognathus (section)

{{Short description|Extinct genus of cynodonts}}
{{automatic taxobox
| fossil_range = [[Late Triassic]]<br />~{{Fossil range|235|221.5}}
| image = Probainognathus jenseni life restoration.jpg
| image_caption = Restoration of ''Probainognathus jenseni''
| display_parents = 2
| taxon = Probainognathus
| authority = [[Alfred Romer|Romer]], 1970
| type_species = '''''Probainognathus jenseni'''''
| type_species_authority = [[Alfred Romer|Romer]], 1970
}}

'''''Probainognathus''''' meaning “progressive jaw” is an extinct [[genus]] of [[cynodont]]s that lived around 235 to 221.5 million years ago, during the [[Late Triassic]] in what is now [[Argentina]]. Together with the genus ''[[Bonacynodon]]'' from Brazil, ''Probainognathus'' forms the family [[Probainognathidae]]. ''Probainognathus'' was a relatively small, [[carnivorous]] or [[insectivorous]] cynodont. Like all cynodonts, it was a relative of [[mammal]]s, and it possessed several mammal-like features. Like some other cynodonts, ''Probainognathus'' had a double jaw joint, which not only included the [[quadrate bone|quadrate]] and [[articular]] bones like in more basal synapsids, but also the [[squamosal]] and [[surangular]] bones. A joint between the [[Dentary bone|dentary]] and squamosal bones, as seen in modern mammals, was however absent in ''Probainognathus''.