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Archaeohippus
Taxonomy
Archaeohippus was named by Gidley (1906).
It was synonymized subjectively with Parahippus by Hay (1930), Matthew (1932).
It was assigned to Equinae by Prothero and Schoch (1989); to Anchitheriinae by Gidley (1907), Quinn (1955), Forsten (1975), MacFadden (1998); and to Equidae by Gidley (1906), Bode (1934), Stirton (1940), Gazin and Collins (1950), Carroll (1988), Evander (1989), O'Sullivan (2003), Boessenecker (2011).
It was synonymized subjectively with Parahippus by Hay (1930), Matthew (1932).
It was assigned to Equinae by Prothero and Schoch (1989); to Anchitheriinae by Gidley (1907), Quinn (1955), Forsten (1975), MacFadden (1998); and to Equidae by Gidley (1906), Bode (1934), Stirton (1940), Gazin and Collins (1950), Carroll (1988), Evander (1989), O'Sullivan (2003), Boessenecker (2011).
Synonymy list
| Year | Name and author |
|---|---|
| 1906 | Archaeohippus Gidley p. 385 |
| 1907 | Archaeohippus Gidley p. 867 |
| 1934 | Archaeohippus Bode |
| 1940 | Archaeohippus Stirton |
| 1950 | Archaeohippus Gazin and Collins p. 15 |
| 1955 | Archaeohippus Quinn |
| 1975 | Archaeohippus Forsten p. 3 |
| 1988 | Archaeohippus Carroll |
| 1989 | Archaeohippus Evander |
| 1989 | Archaeohippus Prothero and Schoch p. 531 |
| 1998 | Archaeohippus MacFadden p. 545 |
| 2003 | Archaeohippus O'Sullivan |
| 2011 | Archaeohippus Boessenecker p. 2 |
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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.
G. †Archaeohippus Gidley 1906
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†Archaeohippus blackbergi Hay 1924
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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 stenolophus Lambe 1905
†Archaeohippus ultimus Cope 1886
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Gidley 1906 | Skull 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 1955 | Skull 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. |