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Hyracotheriinae
Taxonomy
Hyracotheriinae was named by Cope (1881). It was considered paraphyletic by MacFadden (1998).
It was assigned to Lophiodontidae by Cope (1881); to Hyracotheriidae by Lucas and Kondrashov (2004); and to Equidae by Hay (1902), Gidley (1907), Peterson (1919), McGrew (1953), MacFadden (1998) and Franzen (2006).
It was assigned to Lophiodontidae by Cope (1881); to Hyracotheriidae by Lucas and Kondrashov (2004); and to Equidae by Hay (1902), Gidley (1907), Peterson (1919), McGrew (1953), MacFadden (1998) and Franzen (2006).
Subtaxa
Synonymy list
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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.
Subfm. †Hyracotheriinae Cope 1881
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Gidley 1907 | Teeth brachyodont; molariform premolars not more thantwo; digitformula4-3; rudimentaryfifthdigiton hindfot; 1stdigitoffore footnotrepresentedinknownforms. Orbitnotclosedbehind. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Nowak 1991, Hendy et al. 2009, Carroll 1988, Ji et al. 2002, Lillegraven 1979 | |||||
Age range: base of the Duchesnean to the top of the Middle Eocene or 39.70000 to 37.71000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Eocene | USA (Oregon) | Haplohippus texanus (16842) | |
| Duchesnean | USA (Texas) | Haplohippus texanus (16828) |