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Archaeohippus minimus

Osteichthyes - Perissodactyla - Equidae

Taxonomy
Anchitherium minimus was named by Douglass (1899) [also said to be 1900]. It is a 3D body fossil.

It was recombined as Parahippus minimus by Osborn (1918); it was synonymized subjectively with Archaeohippus ultimus by Downs (1956), Dingus (1990); it was considered a nomen dubium by Macdonald (1992); it was recombined as Archaeohippus minimus by Schlaikjer (1937), Stirton (1940), Storer (1975), MacFadden (1998), Tabrum and Nichols (2001).

Synonymy list
YearName and author
1899Achitherium minimus Douglass p. 26
1899Anchitherium minimus Douglass p. 26
1918Parahippus minimus Osborn p. 96 figs. Text Fig. 72a
1937Archaeohippus minimus Schlaikjer
1940Archaeohippus minimus Stirton p. 176
1975Archaeohippus minimus Storer p. 45
1998Archaeohippus minimus MacFadden p. 546
2001Archaeohippus minimus Tabrum and Nichols

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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
subfamilyAnchitheriinae()
genusArchaeohippus
speciesminimus()

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.

†Archaeohippus minimus Douglass 1899
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Diagnosis
ReferenceDiagnosis
H. F. Osborn 1918(Douglass, 1899, pp. 26, 27) Type. (1) I use Anchitherium in the restricted sense in which Scott has
used it, the Madison species being, so far as I know, the second found in America. (2) It is much smaller than A. aurelianense Cuv. or A. equinum Scott. It differs from A. equinum in the following respects: (3) in p3 cross crests united by an isthmus across the median valley, thus forming two enamel lakes, as in modern horses; in p4 protoloph does not reach outer wall of crown; (5) posterior pillar proportionately larger than in Scott's specimen; (6) a small pillar at the entrance of the median valley in p3; (7) in m1 median transverse cross crest more sigmoid than in A. equinum; (8) posterior pillar connectedwithhypocone,withasingleenamelloupextendingoutward; (9)outercrescentswithratherfaintmedianridges. Paratype lower jaw: (1) incisors nearly uniform in size, semi-procumbent; (2) no diastema between incisors and canine; (3) post-canine diastema much longer than in A. equinum; (4) symphysis very long.