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| | Cuffey 2 - Mammal - Like Reptiles |
 | | A band of bone composed of the jugal and the squamosal is adjacent to the lateral temporal fenestra (Broom, 1932; Kemp, 1982; Carroll, 1988). |
 | | The Middle Triassic forms are from South America (Romer, 1969a, 1969b, 1970b, 1973; Romer and Lewis, 1973; Bonaparte and Barbarena, 1975), and the Upper Triassic and Lower Jurassic mammals are known from Eurasia (Kermack, Mussett, and Rigney, 1973, 1981; Kemp, 1982). |
 | | Successively, the relative proportion of the lower jaw comprised of the dentary bone (teeth-bearing bone) gradually increased until the entire lower jaw consisted of the dentary (Kemp, 1982; Sloan, 1983; Carroll, 1988; Hopson, 1987, 1994). |
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