Mammalia - Astrapotheria - Trigonostylopidae
Full reference: F. Ameghino. 1901. Notices préliminaires sur des ongulés nouveaux des terrains crétacés de Patagonie [Preliminary notes on new ungulates from the Cretaceous terrains of Patagonia]. Boletin de la Academia Nacional de Ciencias de Córdoba 16:349-429
Parent taxon: Astrapotheria according to M. C. McKenna and S. K. Bell 1997
See also Ameghino 1901, Carroll 1988, López 2010, Simpson 1934, Simpson 1957 and Simpson 1967
Sister taxa: Antarctodon, Astrapotheriidae, Blastoconus, Blastoconus robertsoni, Eoastrapostylopidae, Grypolophodon, Grypolophodon morenoi, Grypolophodon tuberculosis, Notorhinus, Notorhinus haroldi, Entocasmus, Adrastotherium, Adelotherium
Subtaxa: Albertogaudrya Albertogaudryia Hedralophus Hedralophus bicostatus Seudenius Seudenius cteronc Shecenia Shecenia ctirneru Staurodon supernus Tetragonostylops Trigonostylops Trigonostylops duplex
Type: Trigonostylops
Ecology: scansorial herbivore
Distribution:
• Eocene to Oligocene of Peru (1 collection)
• Eocene of Antarctica (2), Argentina (31), Brazil (2)
• Paleocene of Argentina (3)
Total: 39 collections including 71 occurrences