Fossil remains of Dissacus praenuntius, from Yale Peabody Museum.

Belongs within: Cetferungulata.

The Mesonychoidea are a group of Palaeocene-Eocene carnivorous mammals. Though superficially similar to modern carnivorans, mesonychoids had hoof-like unguals and were more closely related to modern ungulates, probably in particular to artiodactyls.

<==Mesonychoidea V66
    |--Andrewsarchus O01 [incl. Paratriisodon O98; Andrewsarchinae]
    |    |--A. crassum O98
    |    |--*Paratriisodon’ henanensis Chow 1959 O98
    |    `--A. mongoliensis [incl. Paratriisodon gigas Chow et al. 1973] O98
    `--Mesonychia [Hapalodectini] TW01
         |--Hapalodectidae [Hapalodectinae] O98
         |    |--Hapalodectes compressus O01, O98
         |    `--Hapalorestes O98
         `--Mesonychidae [Mesonychinae] O98
              |  i. s.: Honanodon hebetis O98
              |--Dissacus O01 [incl. Hyaenodictis V66]
              |    |--D. indigenus HC97
              |    |--D. magushanensis HC97
              |    |--D. navajovius O98
              |    |--D. praenuntius O98
              |    `--D. willwoodensis O98
              `--+--Ankalagon saurognathus O01, O98
                 `--+--Sinonyx O01
                    `--+--Pachyaena Cope 1874 O01, C76
                       |    |--P. gigantea O98
                       |    |--P. gracilis O98
                       |    `--P. ossifraga Cope 1874 C76
                       `--+--Synoplotherium O01
                          `--+--Mesonyx [Mesonychidae] TW01
                             |    `--M. obtusidens O98
                             `--+--Mongolonyx O98
                                `--+--Mongolestes O98
                                   `--Harpagolestes orientalis Szalay & Gould 1966 TW01, BM78

*Type species of generic name indicated


[BM78] Barnes, L. G., & E. Mitchell. 1978. Cetacea. In Evolution of African Mammals (V. J. Maglio & H. B. S. Cooke, eds) pp. 582-602. Harvard University Press: Cambridge (Massachusetts).

[C76] Cope, E. D. 1876. Report upon the extinct Vertebrata obtained in New Mexico by parties of the expedition of 1874. Geographical Surveys West of the One Hundredth Meridian 4(2): i-iv, 1-370.

[HC97] Huang X. & Chen L. 1997. Mammalian remains from the Late Paleocene of Guichi, Anhui. Vertebrata PalAsiatica 35 (1): 49-67.

[O98] O'Leary, M. A. 1998. Phylogenetic and morphometric reassessment of the dental evidence for a mesonychian and cetacean clade. In The Emergence of Whales (J. G. M. Thewissen, ed.) pp. 133-161. Plenum Press: New York.

[O01] O’Leary, M. A. 2001. The phylogenetic position of cetaceans: Further combined data analyses, comparisons with the stratigraphic record and a discussion of character optimization. American Zoologist 41: 487-506.

[TW01] Thewissen, J. G. M., E. M. Williams, L. J. Roe & S. T. Hussain. 2001. Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls. Nature 413: 277-281.

[V66] Van Valen, L. 1966. Deltatheridia, a new order of mammals. Bulletin of the American Museum of Natural History 132 (1): 1-126.

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