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The protocone is elongate oval shaped in the upper molars (Fig.
The protocone is oval in shape, flattened lingually and isolated from rest of the crown.
M1 subtriangular, with well-developed metaconule united to the protocone, lingual part with a tendency to reduction.
Diagnosis--The largest species of Postcopemys based on its brachydont bunodont molars; also bears the following unique character combination: median mure connected to protocone on M1; m1 with a wide and strongly bilobed procingulum; ectolophid and ectostylid on m1 present; mesolophid well-developed on m1, but short in m2 and not extending to the lingual cingulum.
The skulls of both species also are similar in having long, narrow rostra, moderately inflated frontal regions, short zygomatic plates, a reduced interparietal, and elongated palatal foramina that reaches the level of the protocone of M1.
2 (some more-derived dichobunines plus lantianiine, some eurodexine dichobunids): Ms quadrate, incipiently selenodont; hypocone distinct; metaconule in latter two groups still connected to protocone by postprotocrista, interrupting transverse valley (TV) (OW).
Structures analyzed include the mesostyle, prefossette, postfossette, pli-caballin, protocone, protoconule and hypoconal groove.
In general, the P4 of amphicyonids is laterally compressed and the protocone is nearly in line with the paracone and metacone as exhibited by SDSM 82105.
The metaconule is pyramidal in shape with a moderately developed preme tacrista that is mesiolingually directed to join the slight lingual cingulum between protocone and metaconule.
It appears to be adjoining with protocone at its anterior end.
The protocone and hypocone in premolars are separate on the occlusal surface.