Probainognathidae is a family of meat-eating ‘mammal-like reptiles’, (Therapsids), which lived during the Upper Triassic. According to some authors, it has perhaps two known members: Probainognathus from South America, and the somewhat later Lepagia from Europe. The family was established by Romer in 1973. It’s members were closely related to the even more exotically named Chiniquodontidae.
(This information has been derived from [1] (http://home.arcor.de/ktdykes/cynoga.htm) TRIASSIC CYNODONTS; Cynognathidae, Probainognathidae and ‘Allies’, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)
Probainognathidae
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Therapsida
Order: Cynodonta
Eucynodontia
Family: Probainognathidae Genera
Probainognathus
(?) Lepagia
Ref.
Both genera were small animals. Probainognathus, known from a number of specimens, was about 10cm in length and extremely mammal-like in terms of its anatomy. Remains of Lepagia are restricted to teeth. These most closely resemble the dentition of other carnivorous cynodonts of the Upper Triassic.