Titanotylopus

Titanotylopus Temporal range: Hemphillian–Irvingtonian PreꞒ Ꞓ O S D C P T J K Pg N

T. nebraskensis skeleton at Natural History Museum Los Angeles
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Family:	Camelidae
Tribe:	Camelini
Genus:	†Titanotylopus Barbour & Schultz, 1934^[1]
Species
†Titanotylopus nebraskensis †Titanotylopus spatulus
Synonyms
Gigantocamelus

Titanotylopus is an extinct genus of camel (tribe Camelini), endemic to North America from the late Hemphillian stage of the Miocene through the Irvingtonian stage of the Pleistocene.^[2] It was one of the last surviving North American camels; after its extinction, only Camelops remained.

Its name is derived from the Greek words Τιτάν, τύλος and πούς — "Titan", "knob" and "foot"; thus, "giant knobby-foot".

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Paleobiology

Titanotylopus is distinguished from other early large camelids by its large upper canines amongst other distinguishing dental characteristics, and absence of lacrimal vacuities in the skull. Unlike the smaller, contemporaneous Camelops, Titanotylopus had relatively broad second phalanges, suggesting that it had true padded "cameltoes", like modern camels.^[3]

The species Titanotylopus spatulus was characterized by broad, spatula-like incisors. It has been found at Grand View, Red Light fauna of the Love Formation, Hudspeth County, Texas, Donnelly Ranch, White Rock, Kansas, Mullen II (Kansas), Sandahl Local Fauna (Nebraska), Vallecito Creek, Colorado and 111 Ranch, Arizona in North America.

Appearance

Titanotylopus possessed long and massive limbs, a comparatively small braincase, and a convex slope between the eyes. It reached a shoulder height of over 3.4 m (11 ft) and a weight of 2,485.6 kg (5,480 lb).^[4]^[5]

Like modern camels, it possessed a hump for fat storage; evidence for this is provided by the long neural spines on its thoracic vertebrae.^[3]

Alternate classification

While some authors have considered Gigantocamelus and Titanotylopus to be congeneric, others have maintained them separately. Voorhies and Corner, based on previously unreported material, documented that the two are indeed worthy of separate generic status. Harrison (1985) followed Voorhies and Corner in advocating the use of Titanotylopus for only T. nebraskensis, based on a lower jaw, and Gigantocamelus for G. spatulus, which includes G. fricki. There is a clear difference between the proximal phalanx of specimens assigned to Gigantocamelus and to Titanotylopus, based on skeletons associated with skull material.^{[citation needed]}

References

^ Barbour, Erwin H.; Schultz, C. Bertrand (1934). "A new giant camel, Titanotylopus nebraskensis, gen. et sp. nov". Bulletin of the University of Nebraska State Museum. 1 (36): 291–294.
^ "PaleoBiology Database: Titanotylopus, basic info". Archived from the original on 2012-10-13. Retrieved 2009-09-20.
^ ^a ^b Björn Kurtén and Elaine Anderson Pleistoceone Mammals of North America (New York : Columbia University Press, 1980), pp. 301–302 ISBN 0-231-03733-3
^ Giant Camel Disappeared Species Archived 10 November 2013 at the Wayback Machine. Intechinc.com (5 July 2011)
^ Mendoza, M.; Janis, C. M.; Palmqvist, P. (2006). "Estimating the body mass of extinct ungulates: a study on the use of multiple regression". Journal of Zoology. 270 (1): 90–101. CiteSeerX 10.1.1.541.9021. doi:10.1111/j.1469-7998.2006.00094.x.

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