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Miohippus
Taxonomy
Miohippus was named by Marsh (1874). Its type is Miohippus annectens.
It was synonymized subjectively with Mesohippus by Matthew (1899).
It was assigned to Hyracotheriinae by Hay (1902); to Anchitheriinae by MacFadden (1998); and to Equidae by Marsh (1874), Scott (1913), Osborn (1918), Hay (1930), Stirton (1940), Carroll (1988), Prothero and Schoch (1989) and Lofgren et al. (2020).
It was synonymized subjectively with Mesohippus by Matthew (1899).
It was assigned to Hyracotheriinae by Hay (1902); to Anchitheriinae by MacFadden (1998); and to Equidae by Marsh (1874), Scott (1913), Osborn (1918), Hay (1930), Stirton (1940), Carroll (1988), Prothero and Schoch (1989) and Lofgren et al. (2020).
Species
M. anceps, M. annectens (syn. M. crassicuspis) (type species), M. assiniboiensis (syn. Mesohippus planidens), M. condoni, M. equiceps (syn. Anchitherium brachylophus, Mesohippus acutidens), M. equinanus, M. gemmarosae, M. gidleyi (syn. Mesohippus grallipes, M. validus), M. grandis, M. intermedius, M. longicristis, M. obliquidens (syn. Mesohippus meteulophus, Mesohippus brachystylus, Pediohippus antiquus, Mesohippus eulophus), M. primus, M. quartus, M. taxus
Synonyms
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Synonymy list
Year | Name and author |
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1874 | Miohippus Marsh |
1902 | Miohippus Hay p. 612 |
1908 | Altippus Douglass |
1913 | Miohippus Scott p. 290 |
1918 | Miohippus Osborn |
1930 | Miohippus Hay |
1935 | Pediohippus Schlaikjer |
1940 | Miohippus Stirton |
1988 | Miohippus Carroll |
1989 | Miohippus Prothero and Schoch p. 531 |
1998 | Miohippus MacFadden p. 544 |
2020 | Miohippus Lofgren et al. |
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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. †Miohippus Marsh 1874
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†Miohippus anceps Marsh 1874
†Miohippus condoni Leidy 1870
†Miohippus equiceps Cope 1878
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Invalid names: Anchitherium brachylophus Cope 1879 [synonym], Mesohippus acutidens Sinclair 1905 [synonym]
†Miohippus equinanus Osborn 1918
†Miohippus gemmarosae Osborn 1918
†Miohippus gidleyi Osborn 1904
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Invalid names: Mesohippus grallipes Sinclair 1925 [synonym], Miohippus validus Osborn 1904 [synonym]
†Miohippus grandis Clark and Beerbower 1967
†Miohippus intermedius Osborn and Wortman 1895
†Miohippus longicristis Cope 1878
†Miohippus obliquidens Osborn 1904
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Invalid names: Mesohippus brachystylus Osborn 1904 [synonym], Mesohippus eulophus Osborn 1904 [synonym], Mesohippus meteulophus Osborn 1904 [synonym], Pediohippus antiquus Schlaikjer 1935 [synonym]
†Miohippus primus Osborn 1918
†Miohippus quartus Osborn 1918
†Miohippus taxus Douglass 1908
Invalid names: Altippus Douglass 1908 [synonym], Pediohippus Schlaikjer 1935 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
References: Lillegraven 1979, Ji et al. 2002, Hendy et al. 2009, Carroll 1988, Nowak 1991 |
Age range: base of the Chadronian to the top of the Harrisonian or 37.20000 to 18.50000 Ma
Collections (85 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Bartonian - Rupelian | Mexico (Oaxaca) | M. assinoboiensis (166797) | |
Chadronian | USA (South Dakota) | Mesohippus grandis (17006) | |
Chadronian | Canada (Saskatchewan) | M. grandis (16919) | |
Chadronian | USA (Montana) | M. grandis (16959 16988 17010) M. obliquidens (17041) M. sp. (230861) | |
Orellan | USA (Montana) | M. obliquidens (17109) | |
Orellan | Canada (Saskatchewan) | M. grandis (17111) M. sp. (17055) | |
Orellan | USA (Colorado) | Mesohippus eulophus (17081 17082) | |
Orellan | USA (South Dakota) | Mesohippus grallipes (17296) M. obliquidens (17142) M. sp. (17186 17187 17188 17189 17190) | |
Orellan | USA (Wyoming) | M. sp. (17318) Pediohippus antiquus (17117) | |
Whitneyan | USA (Oregon) | M. sp. (17313 17349) | |
Whitneyan | USA (Florida) | Mesohippus sp. (17341) | |
Whitneyan | USA (North Dakota) | M. sp. (17320) | |
Whitneyan | Canada (Saskatchewan) | M. equiceps (17372) | |
Whitneyan | USA (South Dakota) | Mesohippus grallipes, Mesohippus intermedius, Mesohippus validus, M. crassicuspis, M. gidleyi (17344) Mesohippus meteulophus (17343) M. obliquidens (17317) M. sp. (17336 17338 17384) | |
Whitneyan | USA (Colorado) | M. sp. (17426) | |
Whitneyan - Monroecreekian | Canada (Saskatchewan) | M. sp., M. assiniboiensis, M. intermedius (17306) | |
Whitneyan - Monroecreekian | USA (North Dakota) | M. obliquidens (17330) | |
Whitneyan - late Early Arikareean | USA (California) | M. sp. (17527) | |
Geringian | USA (Nebraska) | M. intermedius (17494 17495) | |
Geringian | USA (Oregon) | M. sp. (17508 93078) M. sp., M. intermedius (17537) | |
Geringian | USA (South Dakota) | M. equiceps (17623 17627 17634 17635 17638 17641) M. equiceps, M. equinanus (17626 17636) M. equinanus (17630) | |
Geringian - Monroecreekian | USA (Florida) | M. sp. (17487) | |
Arikareean | USA (Montana) | M. anceps, M. annectens, M. equiceps (17509) M. sp. (17481 17543 17700) | |
Arikareean | USA (Florida) | M. sp. (17476) | |
Arikareean | USA (Wyoming) | M. sp. (17667) | |
Arikareean | USA (Oregon) | Anchitherium equiceps, M. primus (180202) M. sp. (93080 170311) | |
Arikareean | USA (Nebraska) | M. intermedius (17568) M. sp. (17538) | |
Arikareean | USA (South Dakota) | M. brachystylus (17520) M. equinanus (17447 17460 17461) | |
Arikareean | USA (California) | M. sp. (17701) | |
Arikareean | USA (Idaho) | M. gemmarosae (17586) | |
early Early Arikareean | USA (Nebraska) | M. sp. (156729) | |
early Late Arikareean | USA (Oregon) | M. sp. (36761) | |
Chattian | USA (Oregon) | M. sp. (17603 93079) | |
Monroecreekian | USA (Washington) | M. sp. (119840) M. sp., M. equiceps, M. equinanus (119838) | |
Monroecreekian | Canada (Saskatchewan) | M. sp. (17526) | |
Monroecreekian | USA (South Dakota) | Archaeohippus equinanus (17723) M. equinanus (17564) M. gemmarosae (17545) | |
Monroecreekian - Harrisonian | USA (Oregon) | M. sp. (17528) | |
Harrisonian | USA (Montana) | Altippus taxus (17861) | |
Harrisonian | Canada (Saskatchewan) | M. gemmarosae (17758) | |
Harrisonian | USA (South Dakota) | M. equinanus, M. gemmarosae (17451) | |
Aquitanian | USA (Texas) | M. sp. (18663) | |
Hemingfordian | Canada (Saskatchewan) | M. sp. (18002) |