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Merycochoerus magnus
Taxonomy
Merycochoerus magnus was named by Loomis (1924). Its type locality is Agate (7 Miles NE), which is in a Harrisonian terrestrial horizon in the Marsland Formation of Nebraska.
It was recombined as Merycochoerus proprius magnus by Schultz and Falkenbach (1940); it was synonymized subjectively with Merycochoerus proprius by Galbreath (1953).
It was recombined as Merycochoerus proprius magnus by Schultz and Falkenbach (1940); it was synonymized subjectively with Merycochoerus proprius by Galbreath (1953).
Synonymy list
| Year | Name and author |
|---|---|
| 1924 | Merycochoerus magnus Loomis |
| 1937 | Merycochoerus magnus Thorpe p. 154 figs. Figs. 4, 113; PL XXI |
| 1940 | Merycochoerus proprius magnus Schultz and Falkenbach p. 286 |
| 1980 | Merycochoerus magnus Vanderhill |
| 2007 | Merycochoerus magnus Stevens and Stevens p. 164 |
| 2023 | Merycochoerus magnus Stevens et al. p. 79 figs. Figures 53, 61 |
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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 magnus Loomis 1924
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. S. Stevens et al. 2023 | Large merycochoerine (M1-3 length = 83-87 mm; P2-M3 length = 135-140 mm), just slightly smaller than M. proprius but slightly larger than M. matthewi (Fig. 53C- D), with less robust zygomatic arches than M. proprius, and a sagittal crest that ends some distance before the lambdoid region. Nasal bones point forward, not upward. Dorsal border of the premaxillae along the nasal incision not as strongly sigmoid shaped as in M. proprius, but more curved than in M. matthewi. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1999, Carroll 1988, Lillegraven 1979, Hendy et al. 2009, Lander 1998 | |||||
Age range: base of the Hemingfordian to the top of the Harrisonian or 20.43000 to 18.50000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Harrisonian | USA (Nebraska) | Merycochoerus magnus (type locality: 17739) | |
| Early/Lower Miocene | USA (Colorado) | Merycochoerus proprius (18978) | |
| Early/Lower Hemingfordian | USA (Wyoming) | Merycochoerus magnus (167862) Merycochoerus proprius (18882) | |
| Early/Lower Hemingfordian | USA (Oregon) | Merycochoerus magnus (167866) | |
| Hemingfordian | USA (Wyoming) | Merycochoerus magnus (17886) | |
| Hemingfordian | USA (Colorado) | Merycochoerus magnus (17964) |