Browsing by Author "Soto Acuña, Sergio"
Now showing items 1-14 of 14
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(2012)An almost complete postcranial skeleton recovered from late Maastrichtian beds of central Chile, which can be confidently referred to the clade Elasmosauridae (Sauropterygia: Plesiosauroidea), is described. The material ...
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(PALEONTOLOGICAL SOC INC, 2010-05-25)This study presents the first record of Eocene birds from the western margin of southernmost South America. Three localities in Magallanes, southern Chile, have yielded a total of eleven bird remains, including Sphenisciformes ...
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(2012)Paleogene records of birds in the Eastern margin of the Pacific Ocean have increased in recent years, being almost exclusively restricted to fossil Sphenisciformes (penguins). New avian remains (Ornithurae, Neornithes) ...
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(Inst Paleobiologii Pan, 2021)We describe partial remains of a non-pterodactyloid pterosaur from Upper Jurassic levels of the Atacama Desert in northern Chile. The material includes a left humerus, a possible dorsal vertebra, and the shaft of a wing ...
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(Elsevier, 2020)We describe remains of freshwater turtles from the Upper Cretaceous of Chilean Patagonia. The fossils, which comprise isolated shell fragments and incomplete appendicular bones, were recovered from meandering fluvial ...
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(John Wiley and Sons Inc., 2017)© 2016 Wiley Periodicals, Inc. In early theropod dinosaurs—the ancestors of birds—the hallux (digit 1) had an elevated position within the foot and had lost the proximal portion of its metatarsal. It no longer articulated ...
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(WILEY-BLACKWELL, 2016)Birds have a distally reduced, splinter-like fibula that is shorter than the tibia. In embryonic development, both skeletal elements start out with similar lengths. We examined molecular markers of cartilage differentiation ...
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(SERNAGEOMIN, 2015)Here we studied new fossil chondrichthyans from two localities, Rio de Las Minas, and Sierra Dorotea, both in the Magallanes Region, southernmost Chile. In Rio de Las Minas, the upper section of the Priabonian Loreto ...
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(Servicio Nacional Geología Minerva, 2015)Several Upper Cretaceous plesiosaur specimens recovered from southernmost Chile are described here. These were collected from upper levels of the Dorotea Formation exposed on three different localities (Sierra Baguales, ...
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(Elsevier, 2014)We describe a new specimen of an elasmosaurid plesiosaur from the upper Maastrichtian of central Chile. The specimen includes a relatively complete dorso-caudal series, a few cervical vertebrae, and a fragmentary pelvic ...
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(INST PALEOBIOLOGII PAN, 2010-02-11)The revision by Hiller et al. (2005) of the species Mauisaurus haasti Hector (Plesiosauroidea, Elasmosauridae) from the Late Cretaceous of New Zealand, has provided reliable postcranial characters that permit recognition ...
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(Nature, 2015)Most birds have an opposable digit 1 (hallux) allowing the foot to grasp, which evolved from the non-opposable hallux of early theropod dinosaurs. An important morphological difference with early theropods is the twisting ...
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The developmental origin of zygodactyls feet and its possible loss in the evolution of passeriformes (Royal Society, 2014)The zygodactyl orientation of toes (digits II and III pointing forwards, digits I and IV pointing backwards) evolved independently in different extant bird taxa. To understand the origin of this trait in modern birds, we ...
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(Oxford, 2017)Embryonic muscular activity (EMA) is involved in the development of several distinctive traits of birds.Modern avian diversity and the fossil record of the dinosaur-bird transition allow special insight into their ...
