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Equus (Hesperohippus)
Taxonomy
Equus (Hesperohippus) was named by Hibbard (1955).
It was Onager (Hesperhippus) by Quinn (1957); it was Onager (Hesperohippus) by Mooser (1958).
It was assigned to Equus by Hibbard (1955); and to Onager by Quinn (1957) and Mooser (1958).
It was Onager (Hesperhippus) by Quinn (1957); it was Onager (Hesperohippus) by Mooser (1958).
It was assigned to Equus by Hibbard (1955); and to Onager by Quinn (1957) and Mooser (1958).
Species lacking formal opinion data
Equus algericus, Equus altidens, Equus bressanus, Equus ferus, Equus germanicus, Equus helmei, Equus helmei, Equus hydruntinus, Equus koobiforensis, Equus livenzovensis, Equus marxi, Equus mauritanicus, Equus mosbachensis, Equus namadicus, Equus oldowayensis, Equus petraloniensis, Equus robustus, Equus simionescui, Equus stehlini, Equus valeriani, Equus verae
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.
Subg. †Equus (Hesperohippus) Hibbard 1955
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†Equus (Hesperohippus) mexicanus Hibbard 1955
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Invalid names: Equus midlandensis Quinn 1957 [synonym], Onager oviedoi Mooser 1959 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Hibbard 1955 | horse in which the lower borders of the occipital condyles flex forward so that the posterior faces of the condyles are a t an angle of approximately 90° to the frontal plane. The foramen magnum leaves the skull at a 90" angle to the palatal axis and not, as in Recent or other known Pleistocene forms, at a 45" to 58O angle. The paraoccipital processes are directed forward and the posterior edges form 130" angles with the frontal plane. In the skulls of other equids the processes are nearly vertical or directed slightly backward. There is no shelf or pit on the ventral surface of the processes as in all forms examined, and the ventral surface is directed sharply upward and forward at approximately a 45' angle to the palatal axis of the skull. The premaxillaries are flattened anteriorly and do not curve sharply downward anteriorly as in other species of Equus that were observed. |
Measurements
No measurements are available
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| Source: g = genus, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Nowak 1999, Lillegraven 1979, Ji et al. 2002 | |||||
Age range: Late/Upper Pleistocene or 0.12900 to 0.01170 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Pleistocene (high glacial) | USA (Texas) | Equus midlandensis (93103) |