Guillermo Windholz

Universidad Nacional de Río Negro | UNRN · Alto Valle y Valle Medio Campus

The osteology of Pilmatueia faundezi Coria, Windholz, Ortega & Currie, 2019, a dicraeosaurid sauropod from the Lower Cretaceous of Patagonia, is reassessed from the perspective of a new specimen (MLL-Pv-010) that provides additional information on the axial skeleton and the pectoral girdle. The specimen MLL-Pv-010 is composed of three articulated a...

Skeletal pneumaticity implies bone invasion via air sacs that are diverticula of the respiratory system. Among extant vertebrates, this feature is found only in birds, and in extinct taxa it occurs in saurischian dinosaurs and pterosaurs. The sauropod axial skeleton is characterized by having a complex architecture of laminae and fossae that have u...

The Lohan Cura Formation (Albian) at the Cerro de los Leones locality (Neuquén Province, Patagonia, Argentina) yielded several fossil materials, especially sauropod specimens. Among these, Agustinia ligabuei includes postcranial elements of a single individual, with widely debated taxonomy and phylogeny. Here, we provide an extended osteological de...

Brachytrachelopan is a dicraeosaurid sauropod that comes from the Jurassic of Argentine Patagonia. With the purpose to infer different palaeobiological traits (e.g., ontogenetic stage, growth dynamics, temporal correlation between morphological and anatomical parameters of maturation), we perform an osteohisto-logical study on different postcranial...

Abelisaurids are medium–large-sized theropod dinosaurs that were predominant in the carnivorous fauna during the Late Cretaceous of Gondwana. These predators are abundant in the Cretaceous fossil strata of Patagonia, which yield the best record for this group. In the Late Cretaceous, abelisaurids appear in almost all regions of Gondwana and in all...

Osteological knowledge of the sauropod dinosaur Ligabuesaurus leanzai is increased by the description of new postcranial elements assigned to the holotype MCF-PVPH-233. Furthermore, a newly referred specimen, MCF-PVPH-228, is recognized after a detailed revision of the abundant sauropod material collected from the Lohan Cura Formation outcrops in t...

In the Neuquén Basin, the Portezuelo Formation (Turonian-Coniacian, Upper Cretaceous) is represented by extended fluvial outcrops that are well-known for yielding an abundant and diversified vertebrate fossil record. However, most of the sauropod fossil record is represented by incomplete specimens, and only two taxa are formally described for the...

Despite the large number of paleohistological studies carried out on sauropodomorph dinosaurs, some particular groups, such as dicraeosaurids, have been little explored. The current knowledge about the osteological microanatomy of this family is limited to that from specimens of Dicraeosaurus spp. and the holotype specimen of Suuwassea emiliae. We...

Parvicursorinae is a subclade of alvarezaurid theropods, composed by forms from the Upper Cretaceous of Laurasia. In 2017, Averianov and Sues described fragmentary remains (ZIN PH 2440/16, ZIN PH 2441/16, ZIN PH 2442/16, ZIN PH 2443/16, ZIN PH 2444/16, ZIN PH 2445/16, ZIN PH 2446/16) assigned to the aforementioned subclade, from Bissekty Formation...

Dicraeosauridae is a family of small body-sized sauropod dinosaurs that diversified from the Middle Jurassic to the Lower Cretaceous, whose distinctive feature is a long dorsally projected, bifid neural spines in most of the presacral vertebrae. The dicraeosaurid fossil record is limited to few taxa, therefore each new finding, however fragmentary,...

One of the diagnostic characters of dicraeosaurid sauropods is a reduction of pneumatization of dorsal and caudal vertebrae relative to their Flagellicaudata sister taxon, Diplodocidae. Here, we analyse pneumatic structures in the dicraeosaurid sauropod Pilmatueia faundezi, compare them to those of diplodocoids and report the first record of camera...

Noasauridae is a family of abelisauroid theropods that has a scarce record in South America, which, up to now, was only represented by small-sized forms from the Hauterivian (Lower Cretaceous) Ligabueino andesi Bonaparte; the Santonian (Upper Cretaceous) Velocisaurus unicus Bonaparte; and the Campanian-Maastrichtian (Upper Cretaceous) Noasaurus lea...

A new dicraeosaurid sauropod, Pilmatueia faundezi gen. et sp. nov. from the Mulichinco Formation (Valanginian, Lower Cretaceous, Neuquén Basin, Argentina) is based on isolated skeletal remains collected from a single stratigraphic level, relatively close to each other, with unquestionable dicraeosaurid features in the axial elements. Pilmatueia fau...

Available information about dental morphology of dicraeosaurid sauropods is scarce worldwide, only known from the Upper Jurassic Dicraeosaurus Janensch, 1914 and Suuwassea Harris and Dodson, 2004; and isolated teeth from the Lower Cretaceous putatively referred to Amargasaurus Salgado and Bonaparte, 1991. Here we report three teeth collected associ...

Field works on terrestrial sediments of the Mulichinco Formation at Pilmatué locality, 9 km north from Las Lajas, Neuquén, permitted the collection of dinosaur remains from different taxa, of which the dicraeosaurid sauropods seem to be the most abundantly represented form. The materials correspond to postcranial elements, representing different se...

Here we report the associated remains of an adult sauropod specimen collected from Egg Layer 3, at the egg fossil-bearing site Auca Mahuevo, located at northern Neuquén Province. The remains were buried in coarse sandstone, and collected from a single digging site. The specimen, MCF-PVPH-335 is a fragmentary skeleton represented by an incomplete po...

A new association of continental vertebrate remains found in the lower section of the Mulichinco Formation (Valanginian), 10 km north of Las Lajas, are focus of taphonomic studies. The facies associations correspond to the deposit of fluvial channel, with lateral migration bars and scarce development of floodplains. The fossils are found in a tabul...