La Línea de la Concepción, Spain
La Línea de la Concepción, Spain

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Cruzado-Caballero P.,University of Zaragoza | Ruiz-Omenaca J.I.,University of Zaragoza | Ruiz-Omenaca J.I.,University of Oviedo | Gaete R.,Museu de la Conca Della | And 3 more authors.
Historical Biology | Year: 2014

In the latest Maastrichtian, the European hadrosauroid fauna was more diverse than those of North America and Asia. The European record of hadrosaurid dentaries is an example of this diversity, and most of the sites with mandibular remains are located in the Ibero-Armorican Realm. Within the Iberian Peninsula, most of the remains are located in the Tremp Basin (South Central Pyrenees). Two of the three valid hadrosaurid taxa defined in this basin are from the Blasi sites (Arén, Huesca province): Arenysaurus ardevoli (Blasi-3) and Blasisaurus canudoi (Blasi-1). A new locality in Blasi (Blasi 3.4) has provided a new dentary from an indeterminate euhadrosaurid. This dentary presents some characters intermediate between Arenysaurus and Blasisaurus, some characters similar to Pararhabdodon isonensis (from the nearby province of Lleida), and some characters of its own. Nevertheless, due to its fragmentary character, without dentition or its edentulous anterior part, it cannot be determined above the level of Euhadrosauria. It thus represents a fourth Iberian euhadrosaurian taxon in the Ibero-Armorican Realm, different from Arenysaurus, Blasisaurus and Pararhabdodon, increasing the diversity of hadrosauroids in this realm at the very end of the Cretaceous. © 2013 © 2013 Taylor & Francis.

Vila B.,University of Zaragoza | Vila B.,Institute Catala Of Paleontologia Miquel Crusafont | Oms O.,Autonomous University of Barcelona | Fondevilla V.,Autonomous University of Barcelona | And 4 more authors.
PLoS ONE | Year: 2013

A comprehensive review and study of the rich dinosaur track record of the Tremp Formation in the southern Pyrenees of Spain (Southwestern Europe) shows a unique succession of footprint localities prior to the end-Cretaceous mass extinction event. A description of some 30 new tracksites and data on sedimentary environments, track occurrence and preservation, ichnology and chronostratigraphy are provided. These new track localities represent various facies types within a diverse set of fluvial environments. The footprint discoveries mostly represent hadrosaurian and, less abundantly, to sauropod dinosaurs. The hadrosaur tracks are significantly smaller in size than, but morphologically similar to, those of North America and Asia and are attributable to the ichnogenus Hadrosauropodus. The track succession, with more than 40 distinct track levels, indicates that hadrosaur footprints in the Ibero-Armorican region occur predominantly in the late Maaastrichtian (at least above the early Maastrichtian-late Maastrichtian boundary). The highest abundance is found noticeably found in the late Maastrichtian, with tracks occurring in the C29r magnetochron, within about the latest 300,000 years of the Cretaceous. © 2013 Vila et al.

Vila B.,University of Zaragoza | Vila B.,Institute Catala Of Paleontologia Miquel Crusafont | Galobart A.,Institute Catala Of Paleontologia Miquel Crusafont | Canudo J.I.,University of Zaragoza | And 7 more authors.
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2012

Southwestern Europe is a key setting to evaluate the diversity of non-avian dinosaurs before the end of the Cretaceous (below the K-Pg boundary). The ancient Ibero-Armorican Island, encompassing the current regions of North-East Iberia and South France, provides a substantial record of sauropod fossils. The study of multiple sauropod femora from localities where upper Campanian to uppermost Maastrichtian successions are both exposed, together with the integration of the information gathered from previously known localities has allowed the biodiversity of sauropods to be reassessed within a precise and clear chronostratigraphic framework. From the studied sample several titanosaur forms have been distinguished including a gracile and small-sized titanosaur (Lirainosaurus astibiae), a robust medium-sized titanosaur (Ampelosaurus atacis), a gracile medium-sized titanosaur (Atsinganosaurus velauciensis), and five other indeterminate but distinct titanosaurs, which span the late Campanian through the entire Maastrichtian. The youngest of these occurs in the uppermost part of palaeomagnetic chron C30n in the latest Maastrichtian (~. 0.4-1. Ma before the K-Pg boundary), representing the youngest sauropod yet documented in Eurasia. The pattern of diversity on the Ibero-Armorican Island rules out a decline in sauropod diversity at the very end of the Cretaceous. As with other regions during the late Cretaceous, the abundance and quality of the sauropod fossil record is probably influenced by multiple biases (sampling, ecological, and environmental). © 2012 Elsevier B.V.

Prieto-Marquez A.,Bayerische Staatssammlung fur Palaontologie und Geologie | Dalla Vecchia F.M.,Institute Catala Of Paleontologia Miquel Crusafont | Gaete R.,Museu de la Conca Della | Galobart A.,Institute Catala Of Paleontologia Miquel Crusafont
PLoS ONE | Year: 2013

We provide a thorough re-evaluation of the taxonomic diversity, phylogenetic relationships, and historical biogeography of the lambeosaurine hadrosaurids from the European Archipelago. Previously published occurrences of European Lambeosaurinae are reviewed and new specimens collected from upper Maastrichtian strata of the south-central Pyrenees are described. No support is found for the recognition of European saurolophines in the available hadrosaurid materials recovered so far from this area. A new genus and species of basal lambeosaurine, Canardia garonnensis, is described on the basis of cranial and appendicular elements collected from upper Maastrichtian strata of southern France. C. garonnensis differs from all other hadrosaurids, except Aralosaurus tuberiferus, in having maxilla with prominent subrectangular rostrodorsal flange; it differs from A. tuberiferus in a few maxillary and prefrontal characters. Together with A. tuberiferus, C. garonnensis integrates the newly recognized tribe Aralosaurini. Inference of lambeosaurine interrelationships via maximum parsimony analysis indicates that the other three known European lambeosaurines are representatives of two additional subclades (tribes) of these hadrosaurids: Tsintaosaurini (Pararhabdodon isonensis) and Lambeosaurini (the Arenysaurus ardevoli-Blasisaurus canudoi clade). The tribes Aralosaurini, Tsintaosaurini, Lambeosaurini, and Parasaurolophini are formally defined and diagnosed for the first time. Three event-based quantitative methods of ancestral range reconstruction were implemented to infer the historical biogeography of European lambeosaurines: Dispersal-Vicariance Analysis, Bayesian Binary MCMC, and Dispersal-Extinction-Cladogenesis. The results of these analyses, coupled with the absence of pre-Maastrichtian lambeosaurines in the Mesozoic vertebrate fossil record of Europe, favor the hypothesis that aralosaurins and tsintaosaurins were Asian immigrants that reached the Ibero-Armorican island via dispersal events sometime during the Maastrichtian. Less conclusive is the biogeographical history of European lambeosaurins; several scenarios, occurring sometime during the Maastrichtian, are possible, from vicariance leading to the splitting of Asian or North American from European ranges to a dispersal event from North America to the European Archipelago. © 2013 Prieto-Márquez et al.

Marmi J.,Institute Catala Of Paleontologia Miquel Crusafont | Lujan A.H.,Institute Catala Of Paleontologia Miquel Crusafont | Riera V.,Autonomous University of Barcelona | Gaete R.,Museu de la Conca Della | And 2 more authors.
Cretaceous Research | Year: 2012

Shell remains of a new species of Polysternon (Chelonii, Bothremydidae) have been recently discovered in the new locality of Barranc de Torrebilles (late Maastrichtian, southern Pyrenees). The specimens studied share features with Polysternon provinciale and 'Foxemys' mechinorum and reveal some exclusive characters such as: neural 1 with concave lateral margins; first marginal scutes trapezoidal; posterior margin of the second marginal very close to the suture between peripheral 1 and costal 1; anterior margin of the first vertebral rounded; and anterior lobe of the plastron emarginated. The shell morphology, taphonomy and sedimentology suggest that the proposed species, Polysternon isonae, was fully adapted to freshwater and inhabited fluvial meandering river environments. The Barranc de Torrebilles site is located in the uppermost part of the Maastrichtian succession in the Tremp Basin, only 35 m beneath the unit that contains the Cretaceous/Palaeogene boundary. Thus, P. isonae may be among the last representatives of this genus before its extinction at the end of the Cretaceous Period, according to the current knowledge of the fossil record. © 2011 Elsevier Ltd.

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