Abstract: Two acrodont iguanians from the middle Eocene Huadian Formation, Jilin Province, China, highlight the diversity of Acrodonta early in the Tertiary. The first is characterized by a high number (six) of anterior pleurodont tooth loci and by unicuspid, labiolingually compressed cheek teeth. These teeth, however, show no special similarity to those of major acrodontan clades in which the accessory cusps are absent (e.g., Hydrosaurus, Agaminae). Its relationships are poorly constrained. The dentition of the second taxon is similar to that of a number of living tricuspid agamids (viz., Leiolepis and Draconinae) and species of the fossil taxon Tinosaurus; one osteological feature suggests it may be related to a clade including Agaminae, Hydrosaurinae, Draconinae and Amphibolurinae, but more numerous and complete specimens are required before conclusions are drawn. A comparative examination of living agamids demonstrates that tricuspid teeth similar to those of Tinosaurus spp.are probably characteristic of some 200 living species in Leiolepis and Draconinae.Tinosaurus is inadequately diagnosed with respect to these clades. Because Acrodonta is thought to have been diversifying in the early Cenozoic, fossils from eastern Asiahave great potential to elucidate the evolutionary history of the clade, particularly in combination with molecular-genetic methods. However, the multiplication of new taxon names based only on jaw fragments brings us no closer to this goal.Considerable effort must first be dedicated to the collection and study of modern comparative skeletal material.