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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. |
Measurements
No measurements are available
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Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
References: Lander 1998, Nowak 1999, Lillegraven 1979, Carroll 1988, Hendy et al. 2009 |
Collections (68 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Whitneyan | USA (Nebraska) | Hadroleptauchenia primitiva (17401 17402 17403 17407 17413 17422 17424) Hadroleptauchenia shanafeltae (17374) Hadroleptauchenia shanafeltae, Pseudocyclopidius major (17398) Pseudocyclopidius frankforteri (17386 17417 17419) | |
Whitneyan | USA (South Dakota) | Hadroleptauchenia primitiva (17317 17339 17343 17380) Pseudocyclopidius frankforteri (17329 17378) | |
Whitneyan - Arikareean | USA (Nebraska) | Pseudocyclopidius major (17716) | |
Geringian | USA (South Dakota) | Cyclopidius simus (17636 17637 17641 17644 17653) Hadroleptauchenia extrema (17593) Hadroleptauchenia shanafeltae (17589 17668) Pseudocyclopidius major (17592 17663) | |
Geringian | USA (Nebraska) | Hadroleptauchenia densa (17482 17576) Hadroleptauchenia shanafeltae (17577 17714 17728) Pseudocyclopidius lullianus (17713) Pseudocyclopidius major (17525 17570 17595 17694 17707 17710 17720) | |
Arikareean | USA (Montana) | Cyclopidius emydinus (17722) Cyclopidius simus (17478) | |
Arikareean | USA (Wyoming) | Cyclopidius densa (17467) Hadroleptauchenia densa (17502 17532 17703) Hadroleptauchenia extrema (17686) Leptauchenia major (17727) | |
Arikareean | USA (Colorado) | Pseudocyclopidius major (17500) | |
Arikareean | USA (Nebraska) | Cyclopidius densa (17515) Hadroleptauchenia densa (17530) Hadroleptauchenia shanafeltae (17572) Hadroleptauchenia shanafeltae, Pseudocyclopidius major (17568 17717) Leptauchenia margeryae (17569) Leptauchenia sp. (17513) Pseudocyclopidius major (17473 17538 17598 17602 17719) | |
Arikareean | USA (South Dakota) | Hadroleptauchenia shanafeltae (17520 17606) Leptauchenia major (type locality: 17496) | |
early Early Arikareean | USA (Nebraska) | Leptauchenia major (156729) | |
early Early Arikareean - late Early Arikareean | USA (Wyoming) | Hadroleptauchenia densa (17691) |