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P. S. Martin and R. G. Klein, University 554 of Arizona Press. 555 57. Fariña RA, Vizcaíno SF, Iuliis GD, Megafauna: Giant Beasts of Pleistocene South, 1989.

. America,

, Submitted to Proceedings of the Royal Society B: For Review Only supplementary material, figures S9, S10)

M. Euphractinae,

-. Notes and . Sd, Standard Deviation; 95% CredI: 95% Credibility Interval; *: Used as a priori calibration constraints; MRCA: Most 592 Recent Common Ancestor