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Labocania - Video Learning - WizScience.com
Labocania - Video Learning - WizScience.com
Published: 2015/09/17
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Labocania, informacion paleovideo
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WIKIPEDIA ARTICLE

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Labocania
Temporal range: Late Cretaceous, 73 Ma
Labocania anomala.jpg
Hypothetically restored as a tyrannosaur
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Superfamily: Tyrannosauroidea
Genus: Labocania
Molnar, 1974
Type species
Labocania anomala
Molnar, 1974

Labocania is a genus of carnivorous theropod, possibly tyrannosauroid, dinosaur from Baja California, Mexico, which lived 73 million years ago, in the Campanian stage of the late Cretaceous Period.

In the summer of 1970, the National Geographic Society and the Los Angeles County Museum of Natural History organised a joint paleontological expedition, led by geologist William J. Morris, to the Arroyo del Rosario in Baja California. While prospecting, volunteer Harley James Garbani discovered the skeleton of a theropod north of Punta Baja near Cerro Rayado.[1] Garbani excavated the site in 1970 and 1971.

The type species, Labocania anomala, was described and named by Ralph Molnar in 1974. The generic name references the La Bocana Roja Formation, named after la Bocana Roja, "the red estuary". The specific name means "anomalous" in Latin, in reference to the distinctive build.[1]

The holotype, LACM 20877, was found in a layer of the La Bocana Roja Formation, dating from the late Campanian, about 73 million years old. It consists of a very fragmentary skeleton with skull elements, including a right quadrate, a left frontal, a piece of the left maxilla, a fragment of the dentarium, a chevron, the upper parts of both ischia, the middle shaft of the right pubis, most of the second right metatarsal, a pedal phalanx and several loose teeth. The elements were not articulated, dispersed over a surface of about two square metres, and strongly weathered. The remains were mixed with the ribs of Hadrosauroidea.[1]

Though its exact size is hard to establish, Labocania was probably a medium-sized carnivore, about six meters (20 ft) long. Gregory S. Paul estimated its length at seven metres, its weight at 1.5 tonnes in 2010.[2] The cranial elements are very robust, and the frontals in particular are strongly thickened. The teeth of the maxilla are gradually recurving and rather flat; those of the premaxilla do not have a D-shaped cross-section.[1]

Because Labocania is based on fragmentary material, its affinities are uncertain. Molnar noted certain similarities between Labocania and tyrannosaurids, especially in the form of the ischium which features a low triangular obturator process and a circular lateral scar on the upper end, but he did not assign Labocania to any family, placing it as Theropoda incertae sedis. Molnar especially compared Labocania with Indosaurus and "Chilantaisaurus" maortuensis, later made the separate genus Shaochilong.[1] Labocania was considered as a possible tyrannosauroid in the 2004 review of the group by Thomas R. Holtz, Jr., who, however, pointed out that the similarities with the Tyrannosauridae were shared with the Coelurosauria in general—no tyrannosauroid synapomorphies were present—and that Labocania also showed some abelisaurid traits such as the thick frontals and a reclining quadrate. On the other hand, the L-shaped chevron and the flattened outer side of the second metatarsal indicated a position in the Tetanurae.[3]

See also[edit]

References[edit]

  1. ^ a b c d e Molnar, R. E. (1974). "A distinctive theropod dinosaur from the Upper Cretaceous of Baja California (Mexico)". Journal of Paleontology. 48 (5): 1009–1017. JSTOR 1303299. 
  2. ^ Paul, G. S. (2010). The Princeton Field Guide to Dinosaurs. Princeton University Press. p. 99. ISBN 978-0-691-13720-9. 
  3. ^ Holtz, Thomas R. (2004). "Tyrannosauroidea". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (eds.). The Dinosauria (Second ed.). Berkeley: University of California Press. pp. 111–136. ISBN 0-520-24209-2. 

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