Tachiraptor admirabilis, unearthed in Venezuela, attacking the herbivorous dinosaur Laquintasaura.
PaleoArt: Maurílio Oliveira | DOI: 10.1098/rsos.140184
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Abstract
Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the
western border of Venezuela, where strata of the La Quinta Formation have yielded the ornithischian Laquintasaura venezuelae and other dinosaur remains. Here, we report isolated bones (ischium and tibia) of a small new theropod, Tachiraptor admirabilis gen. et sp. nov., which differs from all previously known members of the group by an unique suite of features of its tibial articulations. Comparative/phylogenetic studies place the new form as the sister taxon to Averostra, a theropod group that is known primarily from the Middle Jurassic onwards. A new U–Pb zircon date (isotope dilution thermal-ionization mass spectrometry; ID-TIMS method) from the bone bed matrix suggests an earliest Jurassic maximum age for the La Quinta Formation. A dispersal–vicariance analysis suggests that such a stratigraphic gap is more likely to be filled by new records from north and central Pangaea than from southern areas. Indeed, our data show that the sampled summer-wet equatorial belt, which yielded the new taxon, played a pivotal role in theropod evolution across the Triassic–Jurassic boundary
Theropoda Marsh 1881 sensu
Neotheropoda Bakker 1986 sensu
stem-Averostra Paul 2002 sensu
Tachiraptor admirabilis new genus and species
Etymology: The generic name derives from Táchira, the Venezuelan state where the fossil was found, and raptor (Latin for thief), in reference to the probable predatory habits of the animal. The specific epithet honours Simon Bolivar’s ‘Admirable Campaign’, in which La Grita, the town where the type locality is located, played a strategic role.
Langer, M. C., Rincón, A. D., Ramezani, J., Solórzano, A., and O. W. M. Rauhut. 2014. New Dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta Formation,
Venezuelan Andes. Royal Society Open Science. 1: 140184. DOI: 10.1098/rsos.140184
New meat-eating dinosaur lived in the wake of a mass extinction @newsfromscience
http://news.sciencemag.org/latin-america/2014/10/new-meat-eating-dinosaur-lived-wake-mass-extinction
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