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Cormohipparion quinni
Taxonomy
Cormohipparion quinni was named by Woodburne (1996). Its type specimen is F:AM 71888, a skull, and it is a 3D body fossil. Its type locality is Devil's Gulch Horse Quarry, which is in a Barstovian terrestrial horizon in the Valentine Formation of Nebraska.
It was recombined as Hippotherium quinni by Alroy (2007).
It was recombined as Hippotherium quinni by Alroy (2007).
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Cormohipparion quinni Woodburne p. 17 |
| 2007 | Hippotherium quinni Alroy |
| 2007 | Cormohipparion quinni Woodburne |
| 2008 | Cormohipparion quinni Bravo-Cuevas and Ferrusquia-Villafranca |
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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.
†Cormohipparion quinni Woodburne 1996
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. O. Woodburne 1996 | B:ased on the type and referred material, Cormohipparion quinni differs from C. goorisi in being larger; higher crowned; having a more complex upper cheek tooth enamel pattern; shorter dPl as compared to P2; lower cheek teeth with stronger protosty- lids; longer isthmuses on p3-p4; straighter labial enamel band ofproto- and hypoconid; better separated metaconid-metastylid on p2; cranium with DPOF only slightly (versus greatly) pocketed posteriorly. The tip of the lacrimal is similarly eroded by the rear of the DPOF in the two species. Whereas the ba- sicranial dimension (fig. 3, 4, a measure of general size; tables 5, 16) is comparable in the two species, the cranium of C. quinni dif- fers from that of C. goorisi in being dispro- portionately larger in many features. As shown in tables 5, 16 and figures 3-5, 16 this is reflected in a longer skull (fig. 3, 6), longer cheektooth dentition (9), longer (2, 31, 32) and higher facial dimensions (32, 36, 38); a generally more robust snout and palate (12, 13, 14, 15, 25); a wider frontal region (18) and trans-glenoid distance (19). Finally, the DPOF is pocketed only about 15 mm pos- teriorly in contrast to penetrating twice as far, and is thus medial to the anterior border of the orbit in C. goorisi.
Cormohipparion quinni differs from C. oc- cidentale (as defined here for specimens from XMas Quarry, Nebraska; figs. 1-2) in being smaller; lower crowned; having a less com- plex upper cheek tooth enamel pattern (con- tra fig. 13A); dP 1 present with a distinct mor- phology rather than being virtually absent or, if present, only peglike; lower cheek teeth with weaker protostylids; cranium with DPOF mainly an elongate oval rather than being commonly tear-drop shaped (dorsoventrally much higher posteriorly than anteriorly); lac- rimal reaches rear of DPOF. As indicated in tables 5, 17 and figure 16, the basicranium (and hence general size) is larger in C. occi- dentale, despite which C. occidentale still has a longer skull overall (6), longer (1) and wider muzzle (15), a much longer DPOF (33) and POB (32) and other facial elements (34), and a generally wider (18, 19, 20) and higher (35, 36, 37) skull. At the same time, the length of the upper molar series (7) is relatively short- er, the palate relatively narrower (12, 13). Finally, although larger, the DPOF is medi- ally shallower (40) than in C. quinni. |
Measurements
No measurements are available
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| Source: g = genus, subf = subfamily, subc = subclass, c = class, subp = subphylum | |||||
| References: MacFadden 1998, Carroll 1988, Hendy et al. 2009, Lillegraven 1979, Ji et al. 2002, MacFadden and Cerling 1996 | |||||
Age range: base of the Middle Miocene to the top of the Barstovian or 15.98000 to 12.50000 Ma
Collections (11 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Barstovian | USA (South Dakota) | Cormohipparion quinni (174579) | |
| Barstovian | USA (Colorado) | Cormohipparion quinni (18220) | |
| Barstovian | Mexico (Oaxaca) | Cormohipparion quinni (18722) | |
| Barstovian | USA (Nebraska) | Cormohipparion quinni (type locality: 18124 18125 18281 18284 18361 18363 18442) | |
| Middle Miocene | Costa Rica (Alajuela) | Cormohipparion quinni (225600) |