PBDB Taxon

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

Mesonyx

Mammalia - Acreodi - Mesonychidae

Taxonomy

Mesonyx was named by Cope (1872). Its type is Mesonyx obtusidens. It is the type genus of Mesonychia, Mesonychidae.

It was assigned to Mesonychinae by Szalay and Gould (1966) and Zhou et al. (1995); and to Mesonychidae by Cope (1875), Cope (1880), Cope (1880), Scott (1892), Hay (1902), Hay (1930), Carroll (1988), McKenna and Bell (1997), Gingerich (1998), Archibald (1998) and Thewissen et al. (2001).

Species

M. dakotensis, M. nuhetingensis, M. obtusidens (type species), M. uqbulakensis

Synonymy list

Year	Name and author
1872	Mesonyx Cope p. 460
1875	Mesonyx Cope p. 3
1880	Mesonyx Cope
1892	Mesonyx Scott p. 306
1902	Mesonyx Hay p. 750
1930	Mesonyx Hay p. 468
1966	Mesonyx Szalay and Gould p. 134
1988	Mesonyx Carroll
1995	Mesonyx Zhou et al. p. 397
1997	Mesonyx McKenna and Bell p. 367
1998	Mesonyx Archibald p. 319
1998	Mesonyx Gingerich p. 427 figs. FIgure 1
2001	Mesonyx Thewissen et al. p. suppl.

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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
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
order	Acreodi	Matthew 1909
—	Mesonychia
family	Mesonychidae
subfamily	Mesonychinae	Cope 1880
genus	Mesonyx

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. †Mesonyx Cope 1872

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†Mesonyx dakotensis Scott 1892

†Mesonyx nuhetingensis Jin 2012

†Mesonyx obtusidens Cope 1872

†Mesonyx uqbulakensis Tong 1989

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

carnivoref

Reproduction:

viviparoussubc

Created:

2005-08-31 14:02:52

Modified:

2005-08-31 16:02:52

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

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

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

Collections (16 total)

Time interval	Ma	Country or state	Original ID and collection number
Arshantan	56.0 - 37.71	China (Nei Mongol)	M. uqbulakensis (72204)
Early/Lower Eocene	55.8 - 48.6	China (Nei Mongol)	M. nuhetingensis (75275)
Bridgerian	50.3 - 46.2	USA (Colorado)	M. obtusidens (16240 16241)
Bridgerian	50.3 - 46.2	USA (Wyoming)	M. obtusidens (16201 16205 16228 16256 16491) M. sp. (15837)
Middle Eocene	47.8 - 37.71	China (Xinjiang)	M. uqbulakensis (176333 176335)
Early/Lower Uintan	46.2 - 39.7	USA (Colorado)	M. sp. (16623)
Uintan	46.2 - 39.7	USA (Utah)	M. obtusidens (16646 16656) M. sp. (16606)