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Mesohippus exoletus
Taxonomy
Anchitherium exoletum was named by Cope (1874). It is a 3D body fossil.
It was synonymized subjectively with Mesohippus bairdi by Osborn and Wortman (1895), Matthew (1899) and Trouessart (1905); it was recombined as Miohippus exoletus by Hay (1902); it was considered a nomen dubium by Osborn (1904), Osborn (1918) and Macdonald (1992); it was recombined as Mesohippus exoletus by Stirton (1940), Scott (1941), Prothero and Shubin (1989) and MacFadden (1998).
It was synonymized subjectively with Mesohippus bairdi by Osborn and Wortman (1895), Matthew (1899) and Trouessart (1905); it was recombined as Miohippus exoletus by Hay (1902); it was considered a nomen dubium by Osborn (1904), Osborn (1918) and Macdonald (1992); it was recombined as Mesohippus exoletus by Stirton (1940), Scott (1941), Prothero and Shubin (1989) and MacFadden (1998).
Synonyms
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Synonymy list
Year | Name and author |
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1874 | Anchitherium exoletum Cope p. 496 |
1902 | Miohippus exoletus Hay p. 614 |
1918 | Mesohippus trigonostylus Osborn p. 47 figs. Plate 2.5,6. Text Fig. 27. |
1935 | Pediohippus trigonostylus Schlaikjer p. 144 |
1940 | Mesohippus exoletus Stirton p. 170 |
1940 | Mesohippus tribonostylus Stirton p. 170 |
1941 | Mesohippus exoletus Scott |
1941 | Pediohippus trigonostylus Scott |
1951 | Mesohippus trigonostylus Macdonald |
1989 | Mesohippus exoletus Prothero and Shubin |
1998 | Mesohippus exoletus MacFadden p. 543 |
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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.
†Mesohippus exoletus Cope 1874
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Invalid names: Mesohippus trigonostylus Osborn 1918 [synonym]
Diagnosis
Reference | Diagnosis | |
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H. F. Osborn 1918 (Mesohippus trigonostylus) | The specific name M. trigonostylus refers to the progressive triallgular form of the plications of the hypo- style, which is highly distinctive. From the rudiment of the hypostyle on the post-cingulum, as seen in the M. bairdii stage, a cruciform plication extends anteriorly toward the metaloph, branching into an external pli hypostyle and an internal spur (see paratype, dp4, Plate 2.5) which connects with the metaloph. This condition of the hypostyle is very different from that in any other Middle Oligocene species (compare Plate 2.1-8). A somewhat similar condition of the hypostyle is seen in the type of Miohippus validus from the Protoceras zone. |