typotheres) were members of the endemic South
 American group Notoungulata. George Gaylord
 Simpson's views on the…
       
          
        Fig. 4.
 MACN A52-618, holotype of Archaeotypotherium propheticus, mandibular symphysis and portion of
 right horizontal ramus…
       
          
        Fig. 6.
 Specimens included in hypodigm of Ar-
 chaeotypotherium propheticus. A. MACN A52-630,
 right M2 and right m3. B. MACN…
       
          
        nation of the members (e.g., Archaeohegetotheria,
 Hegetoarchaeohyracoidea) could also be used.
 Some combination of these…