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Leptauchenia major
Taxonomy
Leptauchenia major was named by Leidy (1856). It is a 3D body fossil. Its type locality is Eagle Nest Butte (Sharps Fm.), which is in an Arikareean fluvial horizon in the Sharps Formation of South Dakota.
It was recombined as Pseudocyclopidius major by Schultz and Falkenbach (1968).
It was recombined as Pseudocyclopidius major by Schultz and Falkenbach (1968).
Synonyms
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Synonymy list
Year | Name and author |
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1856 | Leptauchenia major Leidy p. 163 figs. not figured |
1857 | Leptauchenia major Leidy p. 89 |
1877 | Brachymeryx feliceps Cope p. 220 |
1877 | Cyclopidius simus Cope p. 221 |
1884 | Leptauchenia major Cope p. 546 |
1884 | Cyclopidius simus Cope p. 547 |
1884 | Cyclopidius emydinus Cope p. 553 |
1893 | Cyclopidius incisivus Scott p. 661 |
1902 | Cyclopidius emydinus Hay p. 670 |
1902 | Leptauchenia major Hay p. 670 |
1902 | Cyclopidius incisivus Hay p. 671 |
1902 | Cyclopidius simus Hay p. 671 |
1925 | Leptauchenia densa Loomis |
1935 | Cyclopidius densa Schlaikjer |
1937 | Leptauchenia major Thorpe p. 238 figs. PI. XXXVI, figs. 5-6; PL XXXVII, figs. 6-8 |
1937 | Cyclopidius densus Thorpe p. 243 figs. Figs. 170-172; PI. XLIX |
1937 | Cyclopidius simus Thorpe p. 249 figs. Pis. XXXVII, figs. 10-1 ; PI. XXXVIII, figs. 1-3 |
1940 | Leptauchenia major Scott p. 705 |
1968 | Cyclopidius emydinus Schultz and Falkenbach |
1968 | Hadroleptauchenia densa Schultz and Falkenbach |
1968 | Hadroleptauchenia extrema Schultz and Falkenbach |
1968 | Hadroleptauchenia shanafeltae Schultz and Falkenbach |
1968 | Leptauchenia margeryae Schultz and Falkenbach |
1968 | Pseudocyclopidius frankforteri Schultz and Falkenbach |
1968 | Pseudocyclopidius major Schultz and Falkenbach |
1968 | Cyclopidius simus Schultz and Falkenbach p. 298 figs. Figures 34, 38, 40 |
1996 | Leptauchenia major CoBabe |
1998 | Leptauchenia major Lander |
2007 | Leptauchenia major Stevens and Stevens p. 158 |
2008 | Leptauchenia major Prothero and Sanchez |
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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.
†Leptauchenia major Leidy 1856
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Invalid names: Brachymeryx feliceps Cope 1877 [synonym], Cyclopidius emydinus Cope 1884 [synonym], Cyclopidius incisivus Scott 1893 [synonym], Cyclopidius simus Cope 1877 [synonym], Hadroleptauchenia extrema Schultz and Falkenbach 1968 [synonym], Hadroleptauchenia shanafeltae Schultz and Falkenbach 1968 [synonym], Leptauchenia densa Loomis 1925 [synonym], Leptauchenia margeryae Schultz and Falkenbach 1968 [synonym], Pseudocyclopidius frankforteri Schultz and Falkenbach 1968 [synonym]
Diagnosis
Reference | Diagnosis | |
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W. B. Scott 1893 (Cyclopidius incisivus) | Like O. simus, but having two small incisors in each premaxillary; the latter bones also of a different shape from those of the former species. | |
D. R. Prothero and F. Sanchez 2008 | Medium to large leptaucheniines (P2-M3 length = 51-62 mm, M1-3 lengths = 34-44 mm, M1-2 lengths = 22-27 mm, and skull lengths = 105-125 mm) with relatively more robust zygomatic arches and larger orbits; teeth hypsodont to very hypsodont; styles on M1-3 and stylids on m1-3 well developed. Contrary to CoBabe’s (1996, p. 578) diagnosis, the presence or absence of the M3 is highly variable in both this species and L. decora. |