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Megacerops

Mammalia - Perissodactyla - Brontotheriidae

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Synonyms
Synonymy list
YearName and author
1848Palaeotherium (Menodus) Pomel
1849Palaeotherium giganteum Pomel
1852Titanotherium Leidy
1856Titanotherium Leidy p. 92
1870Megacerops Leidy p. 2
1873Miobasileus Cope
1873Symborodon Cope
1873Brontotherium Marsh p. 486
1873Titanotherium Marsh p. 486
1875Anisacodon Marsh
1875Brontotherium Marsh
1875Megacerops Marsh
1875Titanotherium Marsh
1875Anisacodon montanus Marsh p. 246
1876Diconodon Marsh
1876Diconodon montanus Marsh
1881Menodus Cope p. 397
1881Symborodon Cope p. 397
1886Menodus Cope
1886Menodus angustigenis Cope p. 3
1887Allops Marsh
1887Brontops Marsh
1887Menops Marsh
1887Titanops Marsh
1887Brontops Marsh p. 326
1887Menops Marsh p. 328 figs. 9-10
1887Titanops Marsh p. 330 fig. 11
1887Allops Marsh p. 331
1887Menodus Scott and Osborn p. 157
1889Haplacodon Cope p. 153
1889Haplacodon angustigenis Cope p. 153
1890Diploclonus Marsh
1890Teleodus Marsh p. 524
1891Menodus Cope p. 8
1891Menodus angustigenis Cope p. 13
1895Titanotherium Osborn and Wortman p. 346
1896Titanotherium montanum Osborn p. 183
1896Titanotherium angustigenis Osborn p. 184
1902Megacerops Hay p. 633
1902Megacerops angustigenis Hay p. 633
1902Brontotherium Hay p. 634
1902Titanotherium Hay p. 635
1902Symborodon Hay p. 637
1902Symborodon montanus Hay p. 637
1902Teleodus Hay p. 638
1902Megacerops angustigenis Osborn
1902Symborodon montanus Osborn
1908Megacerops Lambe
1908Megacerops angustigenis Lambe
1914Brontops Osborn p. 405
1914Brontotherium Osborn p. 405
1914Diploclonus Osborn p. 405
1914Megacerops Osborn p. 405
1929Brontops Osborn
1929Diploclonus Osborn
1929Menodus giganteus Osborn
1929Teleodus Osborn
1935Ateleodon Schlaikjer
1945Teleodus Scott
1967Teleodus Bjork p. 231
1969Brontops Ferrusquia-Villafranca
1988Brontops Carroll
1988Megacerops Carroll
1989Brontops Mader
1989Megacerops Mader
1989Menops Mader
1989Brontops Prothero and Schoch p. 537
1989Megacerops Prothero and Schoch p. 537
1989Menops Prothero and Schoch p. 537
1989Symborodon Prothero and Schoch p. 537
1989Teleodus Prothero and Schoch p. 537
1989Titanotherium Prothero and Schoch p. 537
1998Brontops Mader
1998Megacerops Mader
1998Menops Mader
2008Megacerops Mihlbachler p. 413

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
familyBrontotheriidae()
subfamilyBrontotheriinaeMarsh 1873
tribeBrontotheriiniMarsh 1873
subtribeBrontotheriinaMarsh 1873
BrontotheriitaMarsh 1873
genusMegacerops

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.

Diagnosis
ReferenceDiagnosis
W. B. Scott and H. F. Osborn 1887 (Menodus)Dentition : I. 2/2 (variable), C. 1/1, Pm. 4/3, M. 3/3. The incisors are small and variable in number. The upper and lower median incisors are usually wanting. Molars and premolars alike, resembling those of Chalicotherium in pattern. A stout pair of transversely placed horns developed from the frontals and nasals.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: browserf
Created: 2005-08-31 14:53:16
Modified: 2005-08-31 16:53:16
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Mader 1998, Carroll 1988, Hendy et al. 2009, Ji et al. 2002

Age range: base of the Priabonian to the top of the Early/Lower Chadronian or 38.00000 to 33.90000 Ma

Collections (32 total)


Time interval Ma Country or state Original ID and collection number
Duchesnean40.4 - 37.2USA (Texas) Menodus bakeri (16828 16830)
Priabonian38.0 - 33.9USA (Georgia) Brontotheriidae indet. (45640)
Chadronian37.2 - 33.9USA (Wyoming) Allops marshi (16971) Brontops sp. (16896) M. osborni, Menodus sp. (17045) Menodus heloceras (16920)
Chadronian37.2 - 33.9USA (Colorado) M. kuwagatarhinus (17005)
Chadronian37.2 - 33.9Canada (Saskatchewan) M. sp. (16919 16999) Menodus angustigenis, Menodus proutii, Menodus selwynianus, Menodus syceras (101961)
Chadronian37.2 - 33.9USA (Utah) Allops marshi (16948)
Chadronian37.2 - 33.9USA (South Dakota) Allops serotinus, Brontops robustus, Brontotherium curtum, M. marshi (17006) Allops walcotti (16936) Brontops brachycephalus (16937) Brontops dispar, M. brachycephalus (17012) Brontotherium hatcheri (16978) Brontotherium leidyi (16899) M. bicornutus (17013) M. tyleri (16900) Menodus giganteus, Menodus giganteus (16938) Teleodus avus (168799)
Chadronian37.2 - 33.9USA (Nebraska) Brontops brachycephalus (16929) Brontops dispar (17040)
Chadronian37.2 - 33.9Mexico (Chihuahua) Brontops brachycephalus (17015)
Chadronian37.2 - 33.9USA (Montana) M. kuwagatarhinus (16926)
Chadronian37.2 - 33.9USA (Texas) Menodus bakeri (16931 17016)
Early/Lower Chadronian37.2 - 33.9USA (Montana) Menodus sp. (68415)
Early/Lower Chadronian37.2 - 33.9USA (Wyoming) Menodus heloceras (16904)
Late/Upper Chadronian37.2 - 33.9USA (Colorado) M. sp. (85117)
Middle Chadronian - Late/Upper Chadronian37.2 - 33.9USA (Colorado) M. sp. (156988)