以下演化樹是根據麥肯納等人的研究所假設: Vaughan, Terry A., James M. Ryan, and Nicholas J. Czaplewski. 2000. Mammalogy: Fourth Edition. Saunders College Publishing, 565 pp. ISBN 0-03-025034-X
com. August 11, 2017 [August 13, 2017]. (原始内容存档于2017-08-14). Patrick Saunders. Ryan McMahon, one of Rockies' top prospects, called up to major-league club