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Parahippus maxsoni
Taxonomy
Parahippus maxsoni was named by Jahns (1940). Its type specimen is CIT 1385, a partial skeleton (palate of immature individual with well- preserved deciduous grinding teeth, a cervical vertebra, part of a humerus, shaft of fibula and tibia, incomplete manus), and it is a 3D body fossil. Its type locality is Tick Canyon (CIT 201), which is in an Arikareean fluvial siltstone/sandstone in the Tick Canyon Formation of California.
Synonymy list
| Year | Name and author |
|---|---|
| 1940 | Parahippus maxsoni Jahns p. 182 figs. Plate 1, Figure 1 |
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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.
†Parahippus maxsoni Jahns 1940
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. H. Jahns 1940 | Comparisons based on individual deciduous tooth measurements, as well as on the length of the deciduous premolar series, indicate a size greater than that of Parahippus pristinus, but less than that of P. cognatus Leidy, the genotype, and Merychippus isonesus (Cope). The teeth are short-crowned, with a rather primitive pattern involving simple, straight, connected lophs, strongly developed cingulum below protoloph, and short, well-developed triangular hypostyle. A tiny crochet appears on the metaloph of Dp3 and Dp4. Cement is lacking, or present in negligible amount. The dentition resembles that of P. pristinus, but differs specifically in greater size, and in development of crochet, greater prominence of parastyle and mesostyle, and greater elongation of Dp2. The metapodials and phalanges suggest an animal of rather light build. The pes is anisotridactylous. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Nowak 1991, Hendy et al. 2009, Lillegraven 1979, Ji et al. 2002 | |||||
Age range: Arikareean or 29.50000 to 18.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arikareean | USA (California) | Parahippus maxsoni (type locality: 17852) |