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Merychippus relictus
Taxonomy
Hippotherium relictum was named by Cope (1889). Its type specimen is AMNH 8673, a set of teeth (An upper molar, ?M1, of the left side, associated with a second upper molar, m3, and two lower molars), and it is a 3D body fossil.
It was recombined as Hipparion relictum by Roger (1896), Trouessart (1898), Matthew (1899) and Hay (1902); it was recombined as Neohipparion relictum by Trouessart (1905) and Matthew (1909); it was recombined as Merychippus (Merychippus) relictus by Stirton (1940); it was considered a nomen dubium by Macdonald (1992); it was recombined as Merychippus relictus by Gidley (1907), Merriam and Sinclair (1907), Osborn (1918), Hay (1930), Downs (1956) and MacFadden (1998).
It was recombined as Hipparion relictum by Roger (1896), Trouessart (1898), Matthew (1899) and Hay (1902); it was recombined as Neohipparion relictum by Trouessart (1905) and Matthew (1909); it was recombined as Merychippus (Merychippus) relictus by Stirton (1940); it was considered a nomen dubium by Macdonald (1992); it was recombined as Merychippus relictus by Gidley (1907), Merriam and Sinclair (1907), Osborn (1918), Hay (1930), Downs (1956) and MacFadden (1998).
Synonymy list
Year | Name and author |
---|---|
1889 | Hippotherium relictum Cope |
1896 | Hipparion relictum Roger |
1898 | Hipparion relictum Trouessart |
1899 | Hipparion relictum Matthew |
1902 | Hipparion relictum Hay p. 620 |
1905 | Neohipparion relictum Trouessart |
1907 | Merychippus relictus Gidley p. 906 |
1907 | Merychippus relictus Merriam and Sinclair |
1909 | Neohipparion relictum Matthew |
1918 | Merychippus relictus Osborn p. 100 figs. Plate 13.9, 17.2. Text Fig. 73. |
1930 | Merychippus relictus Hay |
1940 | Merychippus (Merychippus) relictus Stirton p. 181 |
1956 | Merychippus relictus Downs |
1998 | Merychippus relictus MacFadden |
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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.
†Merychippus relictus Cope 1889
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Diagnosis
Reference | Diagnosis | |
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H. F. Osborn 1918 | (Cope, Am. Nat. 1889, p. 254, Osborn, 1918) (1) Grinding surface nearly square; (2) the partly worn crown relatively short, moderately curved; (3) section of internal style (protocone) a wide oval, disconnected with hypocone and hypostyle; (4) hypocone extending as far inward as protocone; (5) median branch of metaconule a posterior spur of protoconule, ptychoid, a pli caballin, abundant cement. (6) About the size of Merychippus seversus and resembling it in many details. |
Measurements
No measurements are available
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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: Barstovian or 16.30000 to 12.50000 Ma
Collections (10 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Miocene | USA (Oregon) | Merychippus relictus (18814 18951 18953 18958 19001 19063) | |
Hemingfordian - Barstovian | USA (Oregon) | Merychippus relictus (18864) | |
Barstovian | USA (Oregon) | Merychippus relictus (18839 19010) | |
Early/Lower Barstovian - early Late Barstovian | USA (California) | Merychippus relictus (156738) |