Editing Probainognathus (section)

== Discovery and naming ==
[[File:El Chiflón 3.jpg|thumb|left|The landscape of [[La Rioja Province, Argentina|La Rioja Province]], in which remains of ''Probainognathus'' have been found]]

The first specimens of ''Probainognathus jenseni'' were discovered in the [[Chañares Formation]] in [[La Rioja Province, Argentina|La Rioja Province]], [[Argentina]], by a group headed by the Harvard collector [[James A. Jensen]]. The specimens were collected {{Convert|3|km|mi}} north of the terminus of the Rio Chañares at the Campo de [[Talampaya]].<ref name="Romer1970">{{cite journal | first1 = Alfred | last1 = Romer | title = The Chañares (Argentina) Triassic Reptile Fauna VI. A Chiniquodontid Cynodont with an Incipient Squamosal-Dentary Jaw Articulation | journal = Breviora | number = 344 | pages = 1–18 | url = https://www.biodiversitylibrary.org/page/4293905 | year = 1970}}</ref>

''Probainognathus jenseni'' was first described and named by the [[Harvard]] paleontologist [[Alfred Sherwood Romer]] in 1970.<ref name="Romer1970"/> The generic name ''Probainognathus'' means “progressive jaw” in [[Greek language|Greek]], referencing its advanced jaw articulation. The specific epithet ''jenseni'' honours James A. Jensen.<ref name="Romer1970"/>

A juvenile skull (PVSJ 410), from the [[Ischigualasto Formation]] of northwestern Argentina, was assigned to cf. ''Probainognathus'' in a 1994 paper by [[José Bonaparte]] and [[Alfred W. Crompton]]. Later studies have shown that the specimen likely belongs to a cynodont more derived than ''Probainognathus''.<ref name="Martinelli2016">{{cite journal |last1=Martinelli |first1=A. G. |last2=Soares |first2=M. B. |last3=Schwanke |first3=C. |title=Two New Cynodonts (Therapsida) from the Middle-Early Late Triassic of Brazil and Comments on South American Probainognathians |journal=PLOS ONE |date=2016 |volume=11 |issue=10 |pages=e0162945 |doi=10.1371/journal.pone.0162945|pmid=27706191 |pmc=5051967 |bibcode=2016PLoSO..1162945M |doi-access=free }}</ref> The specimen was sent through a [[CT scan]] at the [[University of Texas at Austin]], and the resulting 3D model was made available to the public.<ref name="Digimorph">{{cite web |title=Probainognathus sp. †, Fossil Eucynodont |url=https://digimorph.org/specimens/Probainognathus_sp/ |url-status=live |archive-url=https://web.archive.org/web/20240828115202/https://www.digimorph.org/specimens/Probainognathus_sp/ |archive-date=August 28, 2024 |website=Digimorph}}</ref>

In 1994, the [[holotype]] of ''Probainognathus jenseni'', along with several other specimens, were stolen from the [[National University of La Rioja]] in Argentina.<ref name="Sciencepress"/><ref name="dml">{{cite web |title=Hultz, Thomas R. "Missing La Rioja Specimens" |url=https://dml.cmnh.org/1994May/msg00010.html |url-status=dead |archive-url=https://web.archive.org/web/20181225175449/https://dml.cmnh.org/1994May/msg00010.html |archive-date=December 25, 2018 |website=Dml}}</ref>