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Megacerops coloradensis

Mammalia - Perissodactyla - Brontotheriidae

Taxonomy
Megacerops coloradensis was named by Leidy (1870) [genotype; recognized by Osborn 1929, Mader 1989, Mader 1998].

It was recombined as Megaceratops coloradoensis by Cope (1873); it was recombined as Menodus coloradensis by Scott and Osborn (1887); it was recombined as Titanotherium coloradense by Osborn (1896).

Synonyms
Synonymy list
YearName and author
1870Megacerops coloradensis Leidy p. 2
1873Megaceratops coloradoensis Cope p. 29
1873Brontotherium ingens Marsh
1873Brontotherium gigas Marsh p. 486
1887Menodus coloradensis Scott and Osborn p. 158
1887Menodus platyceras Scott and Osborn p. 160
1896Titanotherium coloradense Osborn p. 175 figs. Plate III
1896Titanotherium gigas Osborn p. 175
1896Titanotherium ingens Osborn p. 182
1896Titanotherium platyceras Osborn p. 185 figs. Plate IV
1896Titanotherium ramosum Osborn p. 194 figs. Plate IV
1902Brontotherium leidyi Osborn
1902Brontotherium platyceras Osborn
1902Brontotherium ramosum Osborn
1902Titanotherium ingens Osborn
1902Brontotherium leidyi Osborn p. 105 fig. 9
1908Brontotherium hatcheri Osborn
1929Brontotherium platyceras Osborn
1929Brontotherium ramosum Osborn
1989Megacerops hatcheri Mader
1995Megacerops platyceras Mader and Alexander
1998Megacerops hatcheri Mader
1998Megacerops platyceras Mader
2004Megacerops coloradensis Mihlbachler et al. p. 134
2008Megacerops coloradensis Mihlbachler p. 414

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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()
Therapsida()
RankNameAuthor
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
familyBrontotheriidae()
subfamilyBrontotheriinaeMarsh 1873
tribeBrontotheriiniMarsh 1873
subtribeBrontotheriinaMarsh 1873
BrontotheriitaMarsh 1873
genusMegacerops
speciescoloradensis

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 platyceras)The dentition is unknown. Nasal bones extremely short and obtuse, as in M. dolichoceius and M. acer. The inner contour of the uorns is concave ; they are greatly flattened antero-posteriorly with a ridge-like outer margin, and connected by a well-raised median ridge. The posterior face is nearly plane,
the anterior is convex, so that the section of the horn is plano-convex from base to tip. In side view the horns completely overhang the nasals, and are slightly recurved. The long axis of the horn section is directly transverse.
H. F. Osborn 1896 (Titanotherium ramosum)Horns placed above symphysis, greatly expanded at the summits, section plano-convex; a strong 'connecting crest,' Nasals extremely short. Zygomatic arches expanded into two wide flat plates. Incisors and canines unknown. Premolars with reduced external cingula.