The phylogenetic relationships of sauropod dinosaurs
- P. Upchurch
- Geography, Environmental Science
- 1 September 1998
The results suggest that there are dangers inherent in the view that ‘higher’ level sauropod phylogeny can be accurately reconstructed using only a small number of well-known taxa, and that the results of the randomization tests indicate that the data-matrix probably contains a strong phylogenetic ‘signal’.
Material recognition in the wild with the Materials in Context Database
- Sean Bell, P. Upchurch, Noah Snavely, K. Bala
- Computer ScienceComputer Vision and Pattern Recognition
- 1 December 2014
A new, large-scale, open dataset of materials in the wild, the Materials in Context Database (MINC), is introduced, and convolutional neural networks are trained for two tasks: classifying materials from patches, and simultaneous material recognition and segmentation in full images.
The phylogeny of the ornithischian dinosaurs
Surprisingly, Heterodontosauridae is placed as the most basal group of all well‐known ornithischians, phylogenetically distant from a stem‐defined Ornithopoda, creating a topology that is more congruent with the known Ornithischian stratigraphical record.
The Evolutionary History of Sauropod Dinosaurs
- P. Upchurch
- Environmental Science, Geography
- 29 September 1995
Forked chevrons, which have played such an important role in previous studies of sauropod phylogeny, are here considered to have evolved twice within the Sauropoda, which may reflect a correlation between chevron shape and the use of the tail as a weapon within these twosauropod families.
Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms
The results support the generic separation of the contemporaneous taxa Brachiosaurus, Giraffatitan, and Lusotitan, with the latter recovered as either a brachiosaurid or the sister taxon to Titanosauriformes.
Redescription and reassessment of the phylogenetic affinities of euhelopus zdanskyi (Dinosauria: Sauropoda) from the early cretaceous of China
The results suggest that there were at least two clades of very long‐necked sauropods in East Asia, occurring in the Middle Jurassic (i.e. Omeisaurus + Mamenchisaurus) and Early Cretaceous (e.g. Euhelopus, Erketu), with the latter group perhaps also occurring in Europe (Canudo et al. 2002).
Rates of Dinosaur Body Mass Evolution Indicate 170 Million Years of Sustained Ecological Innovation on the Avian Stem Lineage
Early dinosaurs showed rapid evolutionary rates, which were sustained on the line leading to birds. Maintenance of evolvability in key lineages might explain the uneven distribution of trait…
A NEW SPECIMEN OF APATOSAURUS AJAX (SAUROPODA: DIPLODOCIDAE) FROM THE MORRISON FORMATION (UPPER JURASSIC) OF WYOMING, USA
A revision of Titanosaurus Lydekker (dinosauria ‐ sauropoda), the first dinosaur genus with a ‘Gondwanan’ distribution
The early appearance of titanosaur ichnofossils and body fossils precludes a vicariant origin for the group, but such a pattern cannot yet be ruled out for lower‐level taxa within Titanosauria.