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Archaeohippus

Mammalia - Perissodactyla - Equidae

Synonymy list
YearName and author
1906Archaeohippus Gidley p. 385
1907Archaeohippus Gidley p. 867
1934Archaeohippus Bode
1940Archaeohippus Stirton
1950Archaeohippus Gazin and Collins p. 15
1955Archaeohippus Quinn
1975Archaeohippus Forsten p. 3
1988Archaeohippus Carroll
1989Archaeohippus Evander
1989Archaeohippus Prothero and Schoch p. 531
1998Archaeohippus MacFadden p. 545
2003Archaeohippus O'Sullivan
2011Archaeohippus Boessenecker p. 2

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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
subfamilyAnchitheriinae()
genusArchaeohippus

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. †Archaeohippus Gidley 1906
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Invalid names: Archaeohippus nanus Simpson 1932 [synonym], Parahippus minutalis Hay 1924 [synonym]
†Archaeohippus mannulus O'Sullivan 2003
†Archaeohippus minimus Douglass 1899
†Archaeohippus mourningi Merriam 1913
†Archaeohippus penultimus Matthew 1924
†Archaeohippus ultimus Cope 1886
Diagnosis
ReferenceDiagnosis
J. W. Gidley 1906Skull elongate as compared with Mesohippus; metaloph completely united with the ectoloph; protoconule distinct as in Parahippus, but the prefossette is open between the metalop'h and protoloph, there being no crochet, or anterior median enamel fold in the wall of the metaloph; molars compared with premolars relatively large, their transverse diameters being more nearly equal to those of the premolars than in either Parahippus or Hypohippus; lachrymal and malar fosse well developed, the latter forming a deep pit immediately in front of the orbit; anterior border of orbit above anterior half of m3; lower pi, as well as upper pi, two-rooted 1; both upper and lower molariform teeth with internal basal cingulum.
J. H. Quinn 1955Skull elongate; metaloph completely united with ectoloph; protoconule distinct; transverse diameters of molars nearly equal to those of pre- molars; lachrymal and malar fossae well developed; both upper and lower molari-
_form teeth with internal basal cingulum. The following characters may be added to Gidley's list: crochet present or absent; hypoloph triangular to cross shaped; lower teeth with metaconid and metasty1id separated; parastylid sloping diagonally across anterior face of teeth.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserf
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-08-31 16:55:50
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, Carroll 1988, Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009

Age range: base of the Early/Lower Hemingfordian to the top of the Langhian or 20.43000 to 13.82000 Ma

Collections (78 total)


Time interval Ma Country or state Original ID and collection number
late Late Arikareean29.5 - 18.5USA (Oregon) A. sp. (18013)
Monroecreekian - Harrisonian26.3 - 18.5USA (Florida) A. mannulus (36263)
Harrisonian24.8 - 18.5USA (Nebraska) A. sp. (28043)
Harrisonian24.8 - 18.5USA (Oregon) A. sp. (19037)
Miocene23.03 - 5.333USA (Texas) A. blackbergi (18685)
Miocene23.03 - 5.333USA (Oregon) A. ultimus (18865 18953 19063)
Miocene23.03 - 5.333USA (California) A. mourningi (19335 19577) A. ultimus (19294)
Miocene23.03 - 5.333USA (Florida) A. sp. (18570) Parahippus blackbergi (18522)
Burdigalian20.44 - 15.97USA (Delaware) A. blackbergi (18579)
Burdigalian - Langhian20.44 - 13.82USA (Maryland) A. sp. (18518)
Early/Lower Hemingfordian20.43 - 15.97Panama (Panama City) A. sp. (144879)
Early/Lower Hemingfordian20.43 - 15.97Panama A. sp. (18725)
Early/Lower Hemingfordian20.43 - 15.97USA (Texas) A. blackbergi (18694)
Early/Lower Hemingfordian20.43 - 15.97USA (Nebraska) A. sp. (17881)
Hemingfordian20.43 - 15.97Canada (Saskatchewan) A. stenolophus (17868 17869 17870 18002)
Hemingfordian20.43 - 15.97USA (Florida) A. nanus (18561) Parahippus blackbergi (18586 18597)
Hemingfordian20.43 - 15.97USA (Nebraska) A. penultimus (17871 17872 17920 17952 17961 17987 18000 18001) A. sp. (17895 17986 17991)
Hemingfordian20.43 - 15.97USA (Oregon) A. sp. (212622 212623 212625 212626)
Hemingfordian20.43 - 15.97USA (California) A. sp. (19599)
Hemingfordian20.43 - 15.97USA (South Dakota) A. blackbergi (17912)
Hemingfordian20.43 - 15.97USA (Texas) A. blackbergi (18617 18635) Miohippus blackbergi, Parahippus sp. (18626)
Late/Upper Hemingfordian20.43 - 15.97USA (California) A. mourningi (19369)
Late/Upper Hemingfordian20.43 - 15.97USA (Florida) A. blackbergi (18512)
Hemingfordian - Barstovian20.43 - 12.5USA (California) A. mourningi (19235 19240 19263) A. sp. (19204 19226 19228 19252 19266 19601) A. ultimus (19200)
Barstovian16.3 - 12.5USA (California) A. mourningi (19292 19392 19460) A. sp. (19313)
Barstovian16.3 - 12.5Canada (Saskatchewan) A. minimus (18775) A. ultimus (18794)
Barstovian16.3 - 12.5USA (Idaho) A. minimus (19013)
Barstovian16.3 - 12.5USA (Florida) A. sp. (18585)
Barstovian16.3 - 12.5USA (Montana) A. sp. (18894)
Barstovian16.3 - 12.5USA (Nebraska) A. sp. (18261 18284)
Barstovian16.3 - 12.5USA (Oregon) A. ultimus (18809 18839)
Barstovian16.3 - 12.5USA (New Mexico) A. sp. (19449)
Barstovian16.3 - 12.5USA (South Dakota) A. sp. (174577)
Early/Lower Barstovian16.3 - 12.5USA (California) A. mourningi (19564)
Early/Lower Barstovian - early Late Barstovian16.3 - 12.5USA (California) A. mourningi (156738)
Langhian15.97 - 13.82USA (Maryland) A. sp. (48884)
Langhian15.97 - 13.82USA (Virginia) A. sp. (66065)
Middle Miocene15.97 - 11.608USA (California) A. mourningi (19196)