PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Mesatirhinus

Mammalia - Perissodactyla - Brontotheriidae

Taxonomy

Mesatirhinus was named by Osborn (1908). It is not extant.

It was assigned to Brontotheridae by Osborn (1908) and Carroll (1988); to Dolichorhinae by Riggs (1912), Osborn (1914) and Mader (1998); to Dolichorhinini by Mihlbachler (2008); and to Dolichorhininae by Prothero and Schoch (1989) and Mader (2008).

Species

M. junius, M. megarhinus (syn. M. petersoni)

Synonyms

Palaeosyops junior was named by Leidy (1872).

It was synonymized subjectively with Palaeosyops junius by Leidy (1873); it was synonymized subjectively with Palaeosyops paludosus by Gunnell and Yarborough (2000); it was considered a nomen dubium by Mader (1998) and Mader (2008); it was recombined as Mesatirhinus junius by Osborn (1929) and Mihlbachler (2008).

Synonymy list

Year	Name and author
1872	Palaeosyops junior Leidy p. 277
1902	Palaeosyops junior Hay p. 630
1908	Mesatirhinus Osborn
1912	Mesatirhinus Riggs
1914	Mesatirhinus Osborn p. 405
1929	Mesatirhinus junius Osborn
1988	Mesatirhinus Carroll
1989	Mesatirhinus Prothero and Schoch p. 536
1998	Mesatirhinus Mader p. 530
2008	Mesatirhinus Mader p. 8
2008	Mesatirhinus Mihlbachler p. 409
2008	Mesatirhinus junius Mihlbachler p. 413

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
family	Brontotheriidae	()
subfamily	Brontotheriinae	Marsh 1873
tribe	Dolichorhinini	()
genus	Mesatirhinus

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.

G. †Mesatirhinus Osborn 1908

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†Mesatirhinus megarhinus Earle 1891

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Invalid names: Mesatirhinus petersoni Osborn 1908 [synonym]

Invalid names: Mesatirhinus junius Leidy 1872 [nomen dubium]

Diagnosis

Reference	Diagnosis
B. J. Mader 2008	Medium-sized (length P2 to M3 approximately 128–145 mm) dolichorhinine brontothere with no hypocone on M3, well developed suborbital protuberance, and nasals that are moderately flared distally (see Fig. 2). Within the Dolichorhininae, Mesatirhinus lacks distinctive generic autapomorphies and is distin- guished from other dolichorhinine brontotheres by its plesiomorphic morphology.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

browserf

Reproduction:

viviparoussubc

Created:

2005-08-31 14:53:16

Modified:

2005-08-31 16:53:16

Source: f = family, subc = subclass, c = class, subp = subphylum

References: Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Mader 1998, Carroll 1988

Age range: base of the Bridgerian to the top of the Early/Lower Uintan or 50.30000 to 39.70000 Ma

Collections (6 total)

Time interval	Ma	Country or state	Original ID and collection number
Bridgerian	50.3 - 46.2	USA (Wyoming)	M. megarhinus (16420) M. petersoni (16200 16404) M. sp. (16502 16647)
Early/Lower Uintan	46.2 - 39.7	USA (Colorado)	M. junius (16623)