After McKenna & Bell, 1997
<==o †Periptychidae |-- †Anisonchus |-- †Carsioptychus [Plagioptychus] |-- †Conacodon |-- †Earendil Van Valen, 1978? |-- †Ectoconus |-- †Fimbrethil |-- †Gallisonchus |-- †Haploconus |-- †Hemithlaeus josephi |--o †Maiorana | |-- †M. minuial (Van Valen, 1978) | `-- †M. noctiluca |--o †Mimatuta Van Valen, 1978 | |-- †M. makpialutae | `-- †M. morgoth Van Valen, 1978 |-- †Oxyacodon |--o †Periptychus | |-- †P. coarctatus | `-- †P. carinidens |-- †Pseudanisonchus `-- †Tinuviel
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 - Gazin, C. L., 1976: Mammalian faunal zones of the Bridger Middle Eocene.
--Smithsonian Contributions to Paleobiology: No. 26, pp. iv-25 - Luo, Z.-X., 1991: Variability of dental morphology and the relationships of the earliest arctocyonid species.
–Journal of Vertebrate Paleontology: Vol. 11, #4, pp. 452-471 - McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631 - de Muizon, C. & Cifelli, R. L., 2000: The “condylarths” (archaic Ungulata, Mammalia) from the early Palaeocene of Tiupampa (Bolivia): implications on the origin of the South American ungulates.
–Geodiversitas: Vol. 22, #1, pp. 47-150 - Lucas, S. G., Libed, S. A. & Kondrashov, P. E., 2001: Species-level evolution of Periptychus, a Paleocene “condylarth” from the Western United States.
–Journal of Vertebrate Paleontology: Vol. 21, #3, Supplement to #3, pp. 75A - Zonneveld, J.-P., Gunnell, G. F. & Bartels, W. S., 2000: Early Eocene fossil vertebrates from the southwestern Green River basin, Lincoln and Uinta Counties, Wyoming.
–Journal of Vertebrate Paleontology: Vol. 20, #2, pp. 369-386