Fig. 1.
 MACN A52-617, holotype oi Archaeohyrax patagonicus, left side of skull, viewed as right (adapted from
 Ameghino, 1897…
       
          
        typotheres) were members of the endemic South
 American group Notoungulata. George Gaylord
 Simpson's views on the…
       
          
        Fig. 16.
 Occlusal views of P. eutrachytheroides
 specimens from the Mustersan of Chubut, Argentina. A.
 MLP 61-IV-9-1,…
       
          
        CQ
 S3 c
 as
 Otf a
 a a ?>
 c c g
 ^5)
 3 C
 5 S <4i s
 a s
 •C 'CO,
 <;>
 ^.
 -s: -c '…
       
          
        Fig. 17.
 SGOPV 2901, Pseudhyrax sp. indet., left
 mandibular fragment with partial ml-m3 in oblique la-
 bial view (left) and…
       
          
        a small fossettid directly posterior to the central
 fossa, a condition characteristic of Pseudhyrax; no
 other characters of…
       
          
        Oldfieldthomasia
 Acropithecus
 Eohyrax
 Pseudhyrax
 Archaeotypotherium
 Protarchaeohyrax
 Archaeohyrax
 Hegetotherium
 Fig. 18…
       
          
        (in the classical sense of that name) is now shown
 to be paraphyletic.
 From the perspective of phylogenetic taxonomy
 (de…
       
          
        nation of the members (e.g., Archaeohegetotheria,
 Hegetoarchaeohyracoidea) could also be used.
 Some combination of these…
       
          
        mostly late Oligocene Deseadan SALMA. Filling
 a niche that presumably was similar to that of the
 hypsodont archaeohyracids,…
       
          
        South American Land Mammal Ages: Correlation to
 global geochronologies, pp. 317-333. In Berggren, W.
 A., D. V. Kent, M.-P.…
       
          
        Reguero, M. a., D. a. Croft, J. J. Flynn, and A. R.
 Wyss. (2003). Small archaeohyracids (Typotheria,
 Notoungulata) from…