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Merychippus missouriensis
Taxonomy
Merychippus missouriensis was named by Douglass (1908). Its type specimen is CM 905, a partial skeleton (a portion of a skull, a mandible, a radius, two femora, two complete and two incomplete metapodials, also numerous fragments), and it is a 3D body fossil. Its type locality is Canyon Ferry Reservoir Earl Douglass Location, which is in a Hemingfordian terrestrial horizon in Montana.
It was recombined as Merychippus (Merychippus) missouriensis by Stirton (1940); it was recombined as Stylonus missouriensis by Kelly and Lander (1988).
It was recombined as Merychippus (Merychippus) missouriensis by Stirton (1940); it was recombined as Stylonus missouriensis by Kelly and Lander (1988).
Synonymy list
| Year | Name and author |
|---|---|
| 1908 | Merychippus missouriensis Douglass p. 274 figs. Pl. LXVI; LXVII, Fig. 5; Pl. LXVIII, Figs. 1 and 2 |
| 1918 | Merychippus missouriensis Osborn p. 119 fig. 93 |
| 1940 | Merychippus (Merychippus) missouriensis Stirton p. 181 |
| 1988 | Stylonus missouriensis Kelly and Lander |
| 2001 | Merychippus missouriensis Tabrum and Nichols p. 92 |
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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.
†Merychippus missouriensis Douglass 1908
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. F. Osborn 1918 | (Douglass, p. 274) (1) Lachrymal fossa long and moderately deep; (2) malar pit with steep posterior side, bounded below by a thin, shelf-like malar-maxillary ridge. (3) Temporary molars brachyodont or brachy-hypsodont; (4) permanent molars curved and strongly hypsodont; (5) both series of teeth with a coating of cement which is not very thick; (6) enamel lakes simple with only one or two simple enamel folds on each; (7) protocone and hypocone laterally
compressed, the former separate from the protoconule but having an angular projection toward the latter; (8) first tempo- rary lower molar minute; (9) intermediate external conule on lower temporary molars concave on the inside, more or less flattened on the outside. (10) Metapodial nearly ninety per cent. of the length of the radius and eighty-four per cent. of the length of the femur exclusive of the proximal epiphysis. (Matthew, 1913) The deciduous premolars are moderately high-crowned. This general type is difficult to distinguish from M. isonesus Cope, with which it agrees in size. |
Measurements
No measurements are available
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| Source: subf = subfamily, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Hendy et al. 2009, MacFadden 1998, Lillegraven 1979, Nowak 1991 | |||||
Age range: Hemingfordian or 20.43000 to 15.97000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hemingfordian | USA (Montana) | Merychippus missouriensis (type locality: 17885) |