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Merycochoerus proprius
Taxonomy
Merycochoerus proprius was named by Leidy (1858) [genotype]. Its type specimen is ANSP 10868, ANSP 10867, NM 156, a mandible, and it is a 3D body fossil. Its type locality is Hemingford Area, which is in a Hemingfordian terrestrial horizon in the Runningwater Formation of Nebraska. It is the type species of Merycochoerus.
Synonymy list
| Year | Name and author |
|---|---|
| 1858 | Merycochoerus proprius Leidy p. 24 |
| 1873 | Merycochoerus proprius Leidy p. 201 |
| 1884 | Merycochoerus proprius Cope p. 535 |
| 1902 | Merycochoerus proprius Hay p. 668 |
| 1906 | Merycochoerus proprius Douglass p. 567 |
| 1937 | Merycochoerus proprius Thorpe p. 157 figs. PI. XXII; PI. XXIII, figs. 1-3 |
| 1940 | Merycochoerus proprius Schultz and Falkenbach p. 280 |
| 2007 | Merycochoerus proprius Stevens and Stevens p. 160 |
| 2023 | Merycochoerus proprius Stevens et al. p. 76 figs. Figures 53, 57-60; Appendix 7A; Table A26 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Merycochoerus proprius Leidy 1858
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. B. Schultz and C. H. Falkenbach 1940 | SKULL.-Average larger and more massive than M. proprius magnus or M. matthewi; very high muzzle and maxillre; maxillary notch of sigmoid curve, below nasals, retracted to a point above MLM 2 ; nasals retracted more than in M. proprius magnus or M. matthewi; tendency for nasals to protrude upward anteriorly; brain case with a pronounced ridge.
MANDIBLE.-More robust than examples of M. matthewi. DENTITIONs.-Slightly heavier than those of M. matthewi, but overlapping in size range with that species. LIMBs.-Definitely heavier than examples of M. matthewi; feet shorter and more robust than those of M. matthewi. | |
| M. S. Stevens et al. 2023 | Largest species of Merycochoerus (M1-3 length = 90-100 mm; P2-M3 length = 130-150 mm; m1-3 length = 95-105 mm; p2-m3 length =135-150 mm); nasals retracted above M1-2, and the nasal bone reduced to a short blunt curve, and pointed upward and anteriorly; pronounced sagittal crest. Dorsal border of premaxillary and maxillary notch has a curved, sigmoidal shape; high, massive rostrum and maxillary |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Lander 1998, Hendy et al. 2009, Carroll 1988, Lillegraven 1979 | |||||
Age range: Hemingfordian or 20.43000 to 15.97000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Hemingfordian | USA (Nebraska) | Merycochoerus proprius (17898 17934 17940 17946 17947 17978 type locality: 234755) | |
| Hemingfordian | Canada (Saskatchewan) | Merycochoerus proprius (17870) | |
| Hemingfordian | USA (Colorado) | Merycochoerus proprius (17965) |