Editing Probainognathus (section)

== Classification ==
When Romer first described ''Probainognathus'' in 1970, he assigned it to the family [[Chiniquodontidae]] based on the animal's overall similarities with that group.<ref name="Romer1970"/> In a 1973 paper, he decided that ''Probainognathus'' was distinct enough from other chiniquodontids to deserve its own family, and thus Probainognathidae was erected.<ref name=Romer1973>Romer, A.S. 1973. The Chanares (Argentina) Triassic reptile fauna. XVIII. Probelesodon minor, a new species of carnivorous cynodont; family Probainognathidae nov. Breviora, 401:1-4</ref> In 2016, a second probainognathid, ''[[Bonacynodon]]'', was described from Brazil.<ref name="Martinelli2016" /> Phylogenetic analyses have generally found probainognathids to be early-diverging members of the clade [[Probainognathia]], being closer to [[mammal]]s than to the [[traversodontid]]s and other [[cynognathia]]ns.<ref name="Martinelli2016" />

The [[cladogram]] below is from a 2023 paper by Stefanello ''et al.'', and shows the position of ''Probainognathus'' within Probainognathia.<ref name="Stefanello2023">{{cite journal |last1=Stefanello |first1=M. |last2=Martinelli |first2=A. G. |last3=Müller |first3=R. T. |last4=Dias-da-Silva |first4=S. |last5=Kerber |first5=L. |title=A complete skull of a stem mammal from the Late Triassic of Brazil illuminates the early evolution of prozostrodontian cynodonts |journal=Journal of Mammalian Evolution |date=2023 |volume=30 |issue=2 |pages=299–317 |doi=10.1007/s10914-022-09648-y|s2cid=256452176 }}</ref>

{{Clade|style=font-size:85%; line-height:85%
|label1=[[Probainognathia]]
|1={{Clade
   |1=''[[Lumkuia]]''
   |2={{Clade
      |1=''[[Chiniquodon]]''
      |2={{Clade
         |label1=[[Probainognathidae]]
         |1={{Clade
            |1=''[[Bonacynodon]]''
            |2='''''Probainognathus'''''
         }} }}
      |3={{Clade
         |1=[[Ecteniniidae]]
         |2={{Clade
            |1=''[[Protheriodon]]''
            |label2=[[Prozostrodontia]]
            |2={{Clade
               |1=[[Prozostrodontidae]]
               |2={{Clade
                  |1=''[[Therioherpeton]]''
                  |2={{Clade
                     |1=''[[Irajatherium]]''
                     |2={{Clade
                        |1=''[[Riograndia]]''
                        |2={{Clade
                           |1={{Clade
                              |1=''[[Diarthrognathus]]''
                              |2=''[[Pachygenelus]]''
                              }}
                           |2={{Clade
                              |1=[[Tritylodontidae]]
                              |2={{Clade
                                 |1=''[[Botucaraitherium]]''
                                 |2={{Clade
                                    |1=''[[Brasilodon]]''
                                    |2=[[Mammaliaformes]]
}} }} }} }} }} }} }} }} }} }} }} }} }}