Gondwanatherium

Gondwanatherium is an extinct mammal genus from the Upper Cretaceous of Patagonia. It was a member of the extinct taxon of Gondwanatheria, and lived during 'the age of the dinosaurs'.
The position of gongwanatherians with Mammalia is not yet clear.

Genus: Gondwanatherium Bonaparte JF, 1986
'Gondwana beast'

Species: Gondwanatherium patagonicum Bonaparte JF, 1986
Place: Los Alamitos, Patagonia
Country: Argentina
Age: Upper Cretaceous
Remarks: Though earlier than Sudamerica, Gondwantherium is held to be more anatomically derived. This may sound surprising, but there's no reason why ancestral lines might not outlive descended ones.
Reference: Bonaparte (1986), Sobre Mesungulatum[?] houssayi y nuevos mamíferos Cretácicos de Patagonia, Argentina. (Spanish, with English summary). Actas Congr. Argent. Paleontol. Bioestratigr. 4, p.48-61.

Page reference: McKenna MC & Bell SK, (1997), Classification of Mammals Above the Species Level. Columbia University Press.

(This information has been derived from [1] (http://home.arcor.de/ktdykes/gondwanatheria.htm) MESOZOIC MAMMALS; Gondwanatheria, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)