After McKenna & Bell, 1997 and Norris, 2000
<==o Selenodontia Scopoli, 1777 (selenodonts) |-- †Bunomeryx [Bunomerycidae] `--o Neoselenodontia |--o Ruminantia Scapoli, 1777 sensu Norris, 2000 | |?- †Protoceratidae Marsh, 1891 sensu Norris, 2000 | `-- Ruminantia Scapoli, 1777 (ruminants; märehtijät) `--o Tylopoda (Camel-like artiodactyls; kamelieläimet) |--o †Xiphodontidae | |-- †Dichodon [Tetraselenodon] | |-- †Haplomeryx | |-- †Paraxiphodon | `-- †Xiphodon `--+?-o †Protoceratoidea Marsh, 1891 | `-- †Protoceratidae Marsh, 1891 sensu McKenna & Bell, 1997 `--o Cameloidea Gray, 1821 (kamelinsukuiset kamelieläimet) |?- †Oromerycidae `-- Camelidae Gray, 1821 (camels; kamelit)
Reference(s):
- Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698. - Carroll, R. L., 1988: Appendix. 594-648.
in Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698. - McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631 - Norris, C. A., 2000: The cranium of Leptotragulus, a hornless protoceratid
(Artiodactyla: Protoceratidae) from the Middle Eocene of North America.
–Journal of Vertebrate Paleontology: Vol. 20, #2, pp. 341-348 - Nowak, R. M., 1991: Walker's Mammals of the World; Part 1.
–The Johns Hopkins University Press, Baltimore and London, 1991, xlviii-642-lxiii - Nowak, R. M., 1991: Walker's mammals of the World; Part 2.
–The Johns Hopkins University Press, Baltimore and London, 1991, xii-643-1629