Results 21 to 30 of about 547 (145)

A Middle Jurassic abelisaurid from Patagonia and the early diversification of theropod dinosaurs. [PDF]

Proc Biol Sci, 2012
Abelisaurids are a clade of large, bizarre predatory dinosaurs, most notable for their high, short skulls and extremely reduced forelimbs. They were common in Gondwana during the Cretaceous, but exceedingly rare in the Northern Hemisphere.
Pol D, Rauhut OW.
europepmc   +3 more sources

Revisiting Velocisaurus unicus Bonaparte 1991 (Theropoda, Ceratosauria, Noasauridae): inferences on the Noasauridae/Abelisauridae systematic [PDF]

, 2020
In 1991, Bonaparte described Velocisaurus unicus upon an almost complete right tibia and a near complete right autopodium. He regarded this specimen a new taxon on the base of a metatarsal II and IV very mediolaterally compressed, being the metatarsal ...
Baiano, Mattia Antonio, Coria, Rodolfo Anibal   +1 more
core   +2 more sources

New insights about the anatomy of the hand of Carnotaurus sastrei (Theropoda: Abelisauridae) [PDF]

Journal of Vertebrate Paleontology, 2009
The abelisaurid theropod Carnotaurus sastrei, from the Late Cretaceous of Argentina, is characterized for the unusual presence of frontal horns and extremely abbreviated forelimbs, among other curious features. In particular, the four digit hand of Carnotaurus shows highly derived features, as recognized in previous works on this animal.
Ruiz Pérez, Javier, Novas, Fernando
  +7 more sources

Cautionary tales on the use of proxies to estimate body size and form of extinct animals. [PDF]

Ecol Evol
Reconstructing the body size and form of extinct animals is of vital importance to our understanding of macroevolution and palaeontology. This is often done using anatomical proxies where extinct species are known only from fragmentary remains. However, there are many limitations influencing the selection of proxy taxa that are frequently overlooked ...
Gayford JH, Engelman RK, Sternes PC, Itano WM, Bazzi M, Collareta A, Salas-Gismondi R, Shimada K.   +7 more
europepmc   +2 more sources

Isolated theropod teeth from the Upper Cretaceous of Goias State (Brazil): northernmost occurrence of Abelisauridae from the Bauru Basin [PDF]

Journal of South American Earth Sciences
Dinosaur fossils are becoming increasingly well-known from the Bauru Basin of Brazil, and represent some of the last occurring dinosaurs in South America before the end-Cretaceous mass extinction.
Brusatte, Steve, Candeiro, Carlos Roberto A., Carabajal, Ariana Paulina, da Costa Pereira, Paulo Victor Luiz Gomes, de Paula, Thainara Arruda, Dias, Tamires, Gil, Livia Motta, Gonzalez-Riga, Bernardo, Ribeiro, Theo B., Vidal, Luciano   +9 more
core   +4 more sources

Machine learning confirms new records of maniraptoran theropods in Middle Jurassic UK microvertebrate faunas

Papers in Palaeontology, Volume 9, Issue 2, March/April 2023., 2023
Abstract Current research suggests that the initial radiation of maniraptoran theropods occurred in the Middle Jurassic, although their fossil record is known almost exclusively from the Cretaceous. However, fossils of Jurassic maniraptorans are scarce, usually consisting solely of isolated teeth, and their identifications are often disputed.
Simon Wills, Charlie J. Underwood, Paul M. Barrett, Philip Mannion   +3 more
wiley   +1 more source

Upper Cretaceous European theropod palaeobiodiversity, palaeobiogeography and the intra‐Maastrichtian faunal turnover: new contributions from the Iberian fossil site of Laño

Papers in Palaeontology, Volume 8, Issue 1, January/February 2022., 2022
Abstract A total of 227 theropod teeth have so far been recovered from the upper Campanian Laño site (northern Iberian Peninsula). The teeth were studied for their qualitative and quantitative features. From the theropod sample found at Laño, seven morphotypes attributed to five taxa are identified: a medium to large abelisaurid (Arcovenator sp.) and ...
Erik Isasmendi, Angelica Torices, José Ignacio Canudo, Philip J. Currie, Xabier Pereda‐Suberbiola, David Button   +5 more
wiley   +1 more source

The first record of Abelisauridae (Theropoda: Ceratosauria) from Uruguay (Late Jurassic, Tacuarembó Formation)

Historical Biology, 2022
An incomplete albeit well preserved tooth from the Late Jurassic Tacuarembó Formation (Uruguay) shows a character combination only found in abelisaurid theropods, i.e. irregular enamel, hooked distal denticles, interdenticular sulci, lanceolate cross-sectional shape, and straight distal border.
Matías Soto, Rafael Delcourt, Max. C. Langer, Daniel Perea   +3 more
openaire   +1 more source

Considerações sobre abelisauridae (Dinosauria: Theropoda) e o registro brasileiro

Terrae Didatica, 2020
Abelisauridae é uma ampla família de dinossauros do grupo Theropoda, que inclui grandes animais carnívoros extintos bem como as aves dos dias atuais. Sua distribuição é majoritariamente sulista, mas alguns espécimes são oriundos da Europa. As relações filogenéticas dos abelissaurídeos têm se tornado refinadas, mas ainda existem discordâncias quanto ao ...
Rafael Delcourt de Seixas Ferreira, Natan Santos Brilhante, Fresia Ricardi-Branco   +2 more
openaire   +2 more sources

Forelimb muscle and joint actions in Archosauria: insights from Crocodylus johnstoni (Pseudosuchia) and Mussaurus patagonicus (Sauropodomorpha) [PDF]

, 2017
Many of the major locomotor transitions during the evolution of Archosauria, the lineage including crocodiles and birds as well as extinct Dinosauria, were shifts from quadrupedalism to bipedalism (and vice versa).
Allen, V, Hutchinson, J R, Otero, A, Pol, D   +3 more
core   +22 more sources