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The earliest dromaeosaurid theropod from South America
A near-complete, small dromaeosaurid is described that is both the most complete and the earliest member of the Maniraptora from South America and which provides new evidence for a unique Gondwanan lineage of DromaeOSauridae with an origin predating the separation between northern and southern landmasses. Expand
Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages
Abstract The Cretaceous terrestrial strata of the Neuquen Basin (northern Patagonia, Argentina) are described together with their tetrapod records. Six local tetrapod assemblages are identified:Expand
A Cretaceous terrestrial snake with robust hindlimbs and a sacrum
The new fossil from the Upper Cretaceous period of Patagonia fills an important gap in the evolutionary progression towards limblessness and retains several features associated with a subterranean or surface dwelling life that are also present in primitive extant snake lineages, supporting the hypothesis of a terrestrial rather than marine origin of snakes. Expand
New Araripesuchus Remains from the Early Late Cretaceous (Cenomanian–Turonian) of Patagonia
Two new crocodyliform specimens found in a recently discovered locality from the Late Cretaceous of Patagonia (Argentina) are described, depicting both specimens as closely related to the previously known South American species of Araripesuchus, depicted as the most basal clade of notosuchians from Gondwana. Expand
Abstract A new specimen of the sauropod titanosaur Neuquensaurus australis, collected in the locality of Cinco Saltos (Patagonia, Argentina), provides an opportunity to improve our knowledge of theExpand
Highly specialized mammalian skulls from the Late Cretaceous of South America
The first mammalian remains from the early Late Cretaceous of South America are described, including two partial skulls and jaws of a derived dryolestoid showing dental and cranial features unknown among any other group of Mesozoic mammals, and an unsuspected morphological and ecological diversity for non-tribosphenic mammals is revealed. Expand
The anatomy of the upper cretaceous snake Najash rionegrina Apesteguía & Zaher, 2006, and the evolution of limblessness in snakes
Najash rionegrina documents an important gap in the evolutionary development towards limblessness, because its phylogenetic affinities suggest that it is the sister group of all modern snakes, including the limbed Tethyan snakes Pachyrhachis, Haasiophis, and Eupodophis. Expand
Large Cretaceous sphenodontian from Patagonia provides insight into lepidosaur evolution in Gondwana
It is proposed, using available evidence, that sphenodontians were not a minor component of the Cretaceous terrestrial ecosystems of South America, and that their ecological replacement by squamates was delayed until the early Tertiary. Expand
A Diplodocid Sauropod Survivor from the Early Cretaceous of South America
Diplodocids are by far the most emblematic sauropod dinosaurs. They are part of Diplodocoidea, a vast clade whose other members are well-known from Jurassic and Cretaceous strata in Africa, Europe,Expand
The sauropod diversity of the La Amarga Formation (Barremian), Neuquén (Argentina)
Abstract A study of the abundant and undescribed isolated and associated bones and teeth from the La Amarga Formation (Barremian of Neuquen, Argentina) permitted the recognition of additional cladesExpand