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Merychippus seversus
Taxonomy
Stylonus seversus was named by Cope (1878). Its type specimen is AMNH 8180, a tooth (isolated upper molar), and it is a 3D body fossil.
It was recombined as Hippotherium seversus by Wortman (1883), Cope (1886) and Cope (1889); it was recombined as Hipparion seversus by Matthew (1889) and Trouessart (1898); it was recombined as Hipparion seversum by Hay (1902); it was recombined as Neohipparion seversus by Trouessart (1905); it was recombined as Merychippus (Merychippus) seversus by Stirton (1940); it was recombined as Pliohippus seversus by Quinn (1987); it was considered a nomen dubium by Macdonald (1992), Kelly (1995) and Kelly (1998); it was recombined as Merychippus seversus by Gidley (1907), Matthew (1909), Osborn (1918), Matthew (1924), Hay (1930), Downs (1956), Downs (1961), Shotwell (1968) and MacFadden (1998).
It was recombined as Hippotherium seversus by Wortman (1883), Cope (1886) and Cope (1889); it was recombined as Hipparion seversus by Matthew (1889) and Trouessart (1898); it was recombined as Hipparion seversum by Hay (1902); it was recombined as Neohipparion seversus by Trouessart (1905); it was recombined as Merychippus (Merychippus) seversus by Stirton (1940); it was recombined as Pliohippus seversus by Quinn (1987); it was considered a nomen dubium by Macdonald (1992), Kelly (1995) and Kelly (1998); it was recombined as Merychippus seversus by Gidley (1907), Matthew (1909), Osborn (1918), Matthew (1924), Hay (1930), Downs (1956), Downs (1961), Shotwell (1968) and MacFadden (1998).
Synonymy list
| Year | Name and author |
|---|---|
| 1878 | Stylonus seversus Cope p. 76 |
| 1883 | Hippotherium seversus Wortman |
| 1886 | Hippotherium seversus Cope |
| 1889 | Hippotherium seversus Cope p. 457 |
| 1889 | Hipparion seversus Matthew |
| 1898 | Hipparion seversus Trouessart |
| 1902 | Hipparion seversum Hay p. 621 |
| 1905 | Neohipparion seversus Trouessart |
| 1907 | Merychippus seversus Gidley |
| 1909 | Merychippus seversus Matthew |
| 1918 | Merychippus seversus Osborn p. 101 figs. Plate 13.8, 17.1. Text Fig. 74 |
| 1924 | Merychippus seversus Matthew |
| 1930 | Merychippus seversus Hay |
| 1940 | Merychippus (Merychippus) seversus Stirton p. 181 |
| 1956 | Merychippus seversus Downs |
| 1961 | Merychippus seversus Downs |
| 1968 | Merychippus seversus Shotwell |
| 1987 | Pliohippus seversus Quinn |
| 1988 | Stylonus seversus Kelly and Lander |
| 1998 | Merychippus seversus MacFadden p. 547 |
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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 seversus Cope 1878
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. D. Cope 1878 | Two superior molar teeth were accompanied by a num- ber of inferior molars as having been all found together, but whether they belong to one individual is uncertain. The dentinal lakes of the superior molar are confluent by the median transverse valley, and increased wear would probably join the posterior pair by their posterior angles. The bor- ders of the cementum lakes are simple, except one or two plicatioins on their opposed adjacent borders, and one at the posterior inner part of the posterior. The internal columns are small, and their sections form two equal ovals with their long axes antero-posterior. The anterior dentinal
lake sends off a narrow loop towards the posterior part of the anterior column. The shaft of the tooth is incurved, and the external face is un- equally divided by the usual ridge. The wide gutters on each side of the latter are uniformly concave, and contain a rather shallow deposit of cementum. | |
| H. F. Osborn 1918 | (1) Crown of superior molar moderately elongate [hypsodont], curved; (2) section of anterointernal column [protocone] an elongate oval with an anterior spur directed toward the internal median group [protoconule]; (3) posterointernal column [hypocone] also elongate oval in section, distinct from postero- internal crescent [metaconule]; (4) crescents [protoconule and metaconufe] separated by wide lakes [fossettes] entirely filled with cement; (5) borders of metaconule crescent ptychoid, protoconule crochet junction with pli caballin; (6) ecto- loph without median paracone and metacone. |
Measurements
No measurements are available
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| Source: subf = subfamily, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, MacFadden 1998, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Nowak 1991 | |||||
Collections
No collection or age range data are available