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Merycochoerus matthewi
Taxonomy
Merycochoerus matthewi was named by Loomis (1924). Its type specimen is AM 12970, a partial skeleton (Skullwith I1(rt.)-M3 (lacking supraoccipital region), mandible with i1(br.)-m3, radius, ulna, manus, and skeletal fragments), and it is a 3D body fossil. Its type locality is AMNH Rosebud 18, which is in a Harrisonian terrestrial horizon in the Rosebud Formation of South Dakota.
Synonymy list
| Year | Name and author |
|---|---|
| 1924 | Merycochoerus matthewi Loomis |
| 1937 | Merycochoerus matthewi Thorpe p. 156 figs. PI. XXIII, figs. 4-5 |
| 1940 | Merycochoerus matthewi Schultz and Falkenbach p. 289 |
| 2007 | Merycochoerus matthewi Stevens and Stevens p. 160 |
| 2023 | Merycochoerus matthewi Stevens et al. p. 79 figs. Figures 53, 62, 63; Appendix 7B; Table A27 |
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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 matthewi Loomis 1924
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. B. Schultz and C. H. Falkenbach 1940 | SKULL.-Smaller and somewhat lighter construction than in M. proprius; muzzle low in comparison with that of M. proprius and nasals not as retracted; maxillary notch of sigmoid curve, below nasals, retracted to a point above PLP 4 ; nasals nearly h6rizontal; brain case more rounded than in M. proprius.
MANDIBLE.-Lighter construction than average of M. proprius. DENTITIONS.-Tendency to be lighter in construction than M. proprius; length of upper and lower series equal in length to smaller examples of M. proprius. LIMBs.-Equal in length to those of M. proprius, but lighter; metapodials longer and lighter than examples of M. proprius. | |
| M. S. Stevens et al. 2023 | Smallest (M1-3 length = 77-88 mm; P2-M3 length = 130-150 mm; m1-3 length = 90-100 mm; p2-m3 length = 135-141 mm) and mostly lightly built of the species of Merycochoerus, with a lower rostrum, and the nasals pointing forward (rather that inclined upward and forward), and flat and longer, rather than short and stubby as in M. magnus and M. proprius; narial notch not nearly as retracted, reaching only to the level of P3-4. Dorsal border of premaxillae and maxillary in the narial notch slopes anteroventrally, with no sigmoidal curve as in more advanced species. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Carroll 1988, Lander 1998, Hendy et al. 2009, Nowak 1999 | |||||
Age range: base of the Early/Lower Hemingfordian to the top of the Middle Miocene or 20.43000 to 11.60800 Ma
Collections (14 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arikareean | USA (Oregon) | Merycochoerus matthewi (188964 188965) | |
| Harrisonian | USA (Wyoming) | Merycochoerus matthewi (17793 17833 17839 17850) | |
| Harrisonian | USA (Nebraska) | Merycochoerus matthewi (17738) Merycochoerus sp. (17809) | |
| Harrisonian | USA (South Dakota) | Merycochoerus matthewi (type locality: 17749) | |
| Early/Lower Miocene | USA (Colorado) | Merycochoerus matthewi (18978) | |
| Early/Lower Hemingfordian | Panama (Panama City) | Merycochoerus matthewi (144879) | |
| Early/Lower Hemingfordian | USA (Oregon) | Merycochoerus matthewi (17925) | |
| Early/Lower Hemingfordian | Panama | Merycochoerus sp. (18725) | |
| Middle Miocene | USA (Colorado) | Merycochoerus matthewi (18976) |