Extended Data Fig. 4: Comparison of the jaw system of P. chuannanensis (holotype, ZDM8601) with the typical tritylodontid pattern represented by Bienotheroides.
From: Convergent evolution of diverse jaw joints in mammaliamorphs
a–c, Ventral view of the cranium of P. chuannanensis (a) and Bienotheroides (b, 16YPDC-01; c, 19YP-67). d–f, Lateral views of the same specimens in a–c. g–i, Medial view of the zygomatic arch formed by the jugal and squamosal, corresponding to a–c, respectively. j–l, Medial (j), posteromedial (k), and lateral (l) views of the dentary of P. chuannanensis. m–o, Medial (m), posteromedial (n), and lateral (o) views of the dentary of Bienotheroides (20YX-1#-0510-1)45. Abbreviations: ang, angular process; arp, articular process; bwp, bulged wall of the postdentary trough; cop, coronoid process; dec, dentary condyle; dpg, dorsal process of the glenoid; glj, glenoid of the jugal; i, incisor; jug, jugal; maf, masseteric fossa; mcg, Mecklian groove; mef, mental foramen; mer, medial ridge; pdt, postdentary trough; sjs, squamosal-jugal suture; squ, squamosal; vgz, ventral groove of the zygoma (of jugal); vpg, ventral process of the glenoid.
