Mammalia - Notoungulata - Mesotheriidae
Synonym: Eutrachytheriidae Ameghino 1897
Parent taxon: Typotheria according to G. Billet 2011
See also Ameghino 1897, Carroll 1988, Cope 1889, MacFadden et al. 1993, Reguero and Prevosti 2010, Shockey et al. 2009, Simpson 1945, Simpson and Minoprio 1949 and Simpson et al. 1962
Sister taxa: Campanorcidae, Griphotherion, Hegetotheriidae, Hemihegetotheriidae, Interatheriidae, Protypotheriidae, Typotheriidae, Typotherioidea
Subtaxa: Mesotheriinae Trachytheriinae Trachytherus
Ecology: scansorial herbivore
Distribution:
• Quaternary of Argentina (15 collections), South Atlantic (1)
• Uquian of Argentina (1)
• Pliocene of Argentina (16), Bolivia (2)
• Huayquerian of Argentina (20)
• Miocene of Argentina (21), Bolivia (11), Chile (6)
• Deseadan of Argentina (9), Bolivia (4), Peru (4)
• Oligocene of Argentina (1)
Total: 111 collections including 137 occurrences