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Acritohippus

Mammalia - Perissodactyla - Equidae

Taxonomy
Acritohippus was named by Kelly (1995). It is not extant.

It was assigned to Equinae by Kelly (1995).

Synonymy list
YearName and author
1995Acritohippus Kelly

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

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.

G. †Acritohippus Kelly 1995
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†Acritohippus isonesus Cope 1889
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Invalid names: Merychippus praecocidens Russell 1933 [synonym]
†Acritohippus quinni Kelly 1995
†Acritohippus stylodontus Merriam 1919
†Acritohippus tertius Osborn 1918
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingsubf
Diet: grazersubf
Diet 2: browsersubf
Reproduction: viviparoussubc
Created: 2005-08-31 14:56:53
Modified: 2005-08-31 16:56:53
Source: subf = subfamily, subc = subclass, c = class, subp = subphylum
References: Lillegraven 1979, Nowak 1991, Carroll 1988, Hendy et al. 2009, MacFadden 1998, Ji et al. 2002

Age range: base of the Barstovian to the top of the Miocene or 16.30000 to 5.33300 Ma

Collections (109 total)


Time interval Ma Country or state Original ID and collection number
Miocene23.03 - 5.333USA (California) A. quinni (19426) Merychippus stylodontus (19577) Stylonus sp. (19326 19334 19597 19607)
Miocene23.03 - 5.333USA (Montana) Merychippus isonesus (18896 18969 19002 19042)
Miocene23.03 - 5.333USA (Florida) Merychippus isonesus (18508) Merychippus tertius (18551)
Miocene23.03 - 5.333USA (Oregon) Merychippus isonesus (18814 18842 18865 18898 18923 18951 18953 18967 18993 19025 19028)
Hemingfordian20.43 - 15.97USA (California) A. tertius (19367)
Hemingfordian20.43 - 15.97USA (Nebraska) A. tertius (17871 17920 17952 17961 17991 18000) Anchitherium sp. (17895 17897) Merychippus isonesus (17915 17968 17970)
Hemingfordian - Barstovian20.43 - 12.5USA (California) Merychippus sp. (19201) Merychippus stylodontus (19197 19199 19202 19221 19223)
Barstovian16.3 - 12.5USA (California) A. stylodontus (19356 19432 19458 19463 19509 19557 19567 19581) Merychippus calamarius (19162) Merychippus isonesus (19510) Merychippus stylodontus (19133 19134 19153 19154 19155 19156 19313 19548 19616) Stylonus sp. (19292 19327 19329 19330 19331 19332 19392 19498 19587 19588 19590)
Barstovian16.3 - 12.5USA (New Mexico) Merychippus isonesus (19449)
Barstovian16.3 - 12.5Canada (Saskatchewan) Merychippus isonesus (18758 18759 18761 18762 18766 18772 18786 18788 18791 18792 18797) Merychippus praecocidens (18794)
Barstovian16.3 - 12.5USA (Idaho) Merychippus isonesus (19013)
Barstovian16.3 - 12.5USA (Oregon) Merychippus isonesus (18809 19027 19031 19056 19092) Merychippus seversus (19017 19019 19020)
Early/Lower Barstovian16.3 - 12.5USA (California) Stylonus stylodontus (19138)
Early/Lower Barstovian16.3 - 12.5USA (Florida) Merychippus isonesus (18549 18589)
Early/Lower Barstovian16.3 - 12.5USA (New Mexico) Merychippus isonesus (19547)
Early/Lower Barstovian16.3 - 12.5USA (Nebraska) A. isonesus (17903 17904 17905 17919 17955 17956 17971 17995 18004 18011 18019)
Hemphillian10.3 - 4.9USA (Montana) Merychippus seversus (19003)