Extended Data Fig. 6: Cheek teeth of Feredocodon in occlusal relationship and comparison with other forms.

A. Lingual view of left P2-M3 and p2-m3 in occlusion (in preserved condition). B. The same teeth tilted lingually. C. Dorsal view in which the roots of the upper and the crowns of the lower are exposed. D. Labial view. E. Crown view of the upper teeth and ventrolabial views of the lower teeth. F. Close-up lingual view (slightly tilted) of the right P6-M3 and p6-m3. G. Lingual view of the left P6-M3 and p6-m3. H. Occlusal relationship of tribosphenic molars. I. Molar occlusal relationship of the docodont Haldanodon (adapted from figure 10.20 of ref. ²³). J. Molar occlusal relationship of the shuotheriid Pseudotribos (adapted from figure 2e of ref. ⁴). Abbreviations: dr, distal root; lr, lingual root; met, metacone ( = cusp c); mr, mesial root; ppr, pseudoprotocone; pr, protocone; prd, protoconid ( = cusp a); pspr, pseudoprotocone (original lablelling); pstal, pseudotalonid; talb, talonid basin. Note 1. The occlusal pattern of Feredocodon is similar to that of Haldanodon; however, in Feredocodon the pseudoprotocone of M2 occludes in the pseudotalonid of m2, whereas in Haldanodon the pseudoprotocone of M2 was interpreted to occlude in the pseudotalonid of m3; the latter was interpreted for Pseudotribos. In both Feredocodon and Haldanodon the pseudoprotocone does not occlude into the pseudotalonid basin, differing from the tribosphenic condition.