Results 11 to 20 of about 352 (132)
Preservação Excepcional de Biomateriais Não Mineralizados em Fósseis do Clado Avialae [PDF]
Anuário do Instituto de Geociências, 2021 Milhares de fosseis de aves primitivas e diversificadasda Era Mesozoica e Cenozoica tem sido descobertos ao redor do mundo. Destes, centenas de estudos encontraram preservacao excepcional de biomateriais mineralizados, permitindo ampliar o conhecimento acerca da sua ecologia e evolucao.
Everton Fernando Alves +1 more
openaire +3 more sources
Unenlagiid theropods: are they members of the Dromaeosauridae (Theropoda, Maniraptora)? [PDF]
Anais da Academia Brasileira de Ciências, 2011 In the present paper we analyze the phylogenetic position of the derived Gondwanan theropod clade Unenlagiidae. Although this group has been frequently considered as deeply nested within Deinonychosauria and Dromaeosauridae, most of the features ...
Federico L. Agnolin, Fernando E. Novas
doaj +2 more sources
Journal of Anatomy, 2021 AbstractWhile the morphology and evolution of the quadrate among early birds and through the evolutionary origin of birds is not well known, we add to knowledge about that past diversity through description of the morphology of the quadrate in the unusually elongate skull of the Cretaceous enantiornithine bird Longipteryx chaoyangensis. The lateral and
Thomas A. Stidham, Jingmai K. O'Connor
openaire +3 more sources
A new small deinonychosaur (Dinosauria: Theropoda) from the Late Cretaceous of Patagônia, Argentina [PDF]
Anais da Academia Brasileira de Ciências, 2011 Here we report on a new small deinonychosaurian theropod, Pamparaptor micros gen. et sp. nov., from the Late Cretaceous of Patagônia, Argentina. Pamparaptor micros exhibits a pedal structure previously unknown among South Américan deinonychosaurians. The
Juan D. Porfiri +2 more
doaj +2 more sources
Journal of Vertebrate Paleontology, 1997 ABSTRACT The fragmentary skeleton of a new Late Cretaceous avialan theropod from Patagonia is described. Patagonykus puertai possesses caudal trunk vertebrae that are slightly convex caudally. The last sacral centrum is ball-shaped caudally, a condition that is also found in the caudal vertebrae. Caudal synsacral vertebrae are keeled ventrally.
Fernando E. Novas
openaire +2 more sources
The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica. [PDF]
Anat Rec (Hoboken)Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Delcourt R +4 more
europepmc +2 more sources
Diet of bird-like troodontid dinosaurs: synthesis of a contentious clade. [PDF]
Biol Rev Camb Philos SocABSTRACT Troodontidae is a clade of small‐to medium‐sized maniraptoran theropods that mainly lived in Laurasia (modern Asia, North America and Europe) during the Jurassic and Cretaceous periods and are believed to have had a variety of diets. The uniqueness of troodontid teeth suggests that they diverged from the typical flesh‐based diet of non‐avian ...
Fan YC, Miller CV, Pittman M.
europepmc +2 more sources
Reconstructing locomotor ecology of extinct avialans: a case study of <i>Ichthyornis</i> comparing sternum morphology and skeletal proportions. [PDF]
Proc Biol Sci, 2023 Avian skeletal morphology is associated with locomotor function, including flight style, swimming and terrestrial locomotion, and permits informed inferences on locomotion in extinct taxa.
Lowi-Merri TM +6 more
europepmc +2 more sources
BMC Biology, 2022 Background Birds are key indicator species in extant ecosystems, and thus we would expect extinct birds to provide insights into the nature of ancient ecosystems. However, many aspects of extinct bird ecology, particularly their diet, remain obscure. One
Case Vincent Miller +4 more
doaj +1 more source
Against unifying homology concepts: Redirecting the debate
Journal of Morphology, Volume 284, Issue 7, July 2023., 2023 Against traditional attempts to theoretically unify the various homology definitions on offer, we put forward the alternative strategy of retaining what is distinctive in various homology conceptualizations as context‐specific research tools. While Lankester's evolutionary construal of homology keeps being misinterpreted, we uncover his mechanistic ...
Devin Y. Gouvêa, Ingo Brigandt
wiley +1 more source