PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Lambdotherium popoagicum

Mammalia - Perissodactyla - Brontotheriidae

Taxonomy

Lambdotherium popoagicum was named by Cope (1880) [genotype; misattributed to Bonillas 1936 by Mader 1998]. It is the type species of Lambdotherium.

Synonyms

Lambdotherium magnum was named by Osborn (1919). Its type specimen is AMNH 17527, a mandible, and it is a 3D body fossil. Its type locality is Huerfano VI, which is in a Wasatchian terrestrial horizon in the Huerfano Formation of Colorado.

It was synonymized subjectively with Lambdotherium popoagicum by Bonillas (1936), Robinson (1966).
Lambdotherium primaevum was named by Loomis (1907).

It was synonymized subjectively with Lambdotherium popoagicum by Sinclair and Granger (1911), Bonillas (1936), Stucky (1984).
Lambdotherium priscum was named by Osborn (1913).

It was synonymized subjectively with Lambdotherium popoagicum by Bonillas (1936).
Lambdotherium progressum was named by Osborn (1913).

It was synonymized subjectively with Lambdotherium popoagicum by Bonillas (1936).

Synonymy list

Year	Name and author
1880	Lambdotherium popoagicum Cope p. 746
1902	Lambdotherium popoagicum Hay p. 629
1907	Lambdotherium primaevum Loomis
1913	Lambdotherium priscum Osborn
1913	Lambdotherium progressum Osborn
1919	Lambdotherium priscum Osborn p. 560
1919	Lambdotherium progressum Osborn p. 560
1919	Lambdotherium magnum Osborn p. 562 fig. 3
1929	Lambdotherium primaevum Osborn
1945	Lambdotherium primaevum Van Houten

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Eugnathostomata
—	Teleostomi	(Bonaparte 1836)
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()

Rank	Name	Author
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
family	Brontotheriidae	()
genus	Lambdotherium
species	popoagicum

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.

†Lambdotherium popoagicum Cope 1880

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Invalid names: Lambdotherium magnum Osborn 1919 [synonym], Lambdotherium primaevum Loomis 1907 [synonym], Lambdotherium priscum Osborn 1913 [synonym], Lambdotherium progressum Osborn 1913 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilep

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, subp = subphylum, p = phylum

References: Ji et al. 2002, Lillegraven 1979, Kiessling 2004, Mader 1998, Carroll 1988

Age range: base of the Lysitean to the top of the Bridgerian or 54.90000 to 46.20000 Ma

Collections (65 total)

Time interval	Ma	Country or state	Original ID and collection number
Lostcabinian	54.9 - 50.5	USA (Wyoming)	Lambdotherium popoagicum (15901 15903 15915 15917 15930 15945 15997 15998 15999 16005 16068 16073 16078)
Lysitean	54.9 - 50.5	USA (Colorado)	Lambdotherium popoagicum (15654)
Wasatchian	54.9 - 50.5	USA (Colorado)	Lambdotherium magnum, Lambdotherium popoagicum, Lambdotherium priscum (15650) Lambdotherium popoagicum (15328 15330 15331 15335 15337 15338 15342 15409 15411 15413 15414 15415 15418 15419 15421 15649)
Wasatchian	54.9 - 50.5	USA (Wyoming)	Lambdotherium popoagicum (15454 15456 15479 15486 15662 15664 15665 15666 15710 15711 15714 15839 15841 15848 15852 15902 15905 15906 15908 15934 15935 15942 15957 15996 16067 16074 27268 46705 186931) Lambdotherium primaevum (15565 15566 15567 15568)
Bridgerian	50.5 - 46.2	USA (Wyoming)	Lambdotherium popoagicum (16505)