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Cormohipparion merriami

Osteichthyes - Perissodactyla - Equidae

Taxonomy
Cormohipparion merriami was named by Woodburne (2007). Its type specimen is AMNH 141219, a skull, and it is a 3D body fossil. Its type locality is June Quarry, which is in a Clarendonian terrestrial horizon in the Valentine Formation of Nebraska.

Synonymy list
YearName and author
2007Cormohipparion merriami Woodburne p. 57

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Panperissodactyla
superorderPerissodactylamorpha
orderPerissodactyla()
superfamilyEquoidea
familyEquidae
subfamilyEquinae
tribeHipparionini
genusCormohipparion
speciesmerriami

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 merriami Woodburne 2007
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Diagnosis
ReferenceDiagnosis
M. O. Woodburne 2007Based on the type and re- ferred material, Cormohipparion merriami is distinguished from other species of the sub- genus Cormohipparion in having lacrimal that extends anteriorly beyond the maxillo-jugal suture but still does not reach the rear of the DPOF. The MSTHT is relatively low (ca. 55 mm) in C. merriami; the protocones are relatively wide and not so elongate. As indicated in figure 20 and in comparison with figure 13, C. merriami is greater than (or likely would range much higher than) all other species in length of palate (no. 2) and has a relatively greater premolar (no. 7) and
thus cheek tooth (no. 9) length than in C. occidentale (unknown in C. johnsoni), with the exception of the palate and cheek teeth of C. skinneri, n.sp. Cormohipparion merriami tends to have a smaller orbit than in C. occidentale (nos. 28–29) and all other species, except for C. johnsoni, in which the orbit is still smaller. The nasal notch in C. merriami is less strongly incised than in C. occidentale (no. 30) but more so than in all other species. The facial length (no. 31) apparently is (or likely would range) larger than in C. occi- dentale and all other species except C. skinneri, n.sp. The POB (no. 32) tends to be shorter in C. merriami than in C. occidentale and all species except the comparably sized C. johnsoni.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingsubf
Diet: grazerg
Diet 2: browserg
Reproduction: viviparoussubc
Created: 2009-01-04 10:23:13
Modified: 2009-01-04 12:58:34
Source: g = genus, subf = subfamily, subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Carroll 1988, Lillegraven 1979, Ji et al. 2002, MacFadden and Cerling 1996, MacFadden 1998

Age range: Clarendonian or 12.50000 to 9.40000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Barstovian - Clarendonian16.3 - 9.4USA (Nebraska) Neohipparion coloradense (18077)
Clarendonian12.5 - 9.4USA (Nebraska) Cormohipparion merriami (type locality: 18217 18260)