There has been much confusion regarding the fossil footprint record of pterosaurs, with both non‐pterosaurian tracks assigned to and pterosaurian track‐makers such as crocodilians turtles. Various authors have also debated whether pterosaurs were bipedal or quadrupedal, erect semi‐erect, digitigrade plantigrade, when progressing on land. Recent claims that Pteraichnus was made by a crocodilian effectively implied there are no known in record. We show here, basis new material from Jurassic...

The Galinha tracksite reveals a sequence of Bajocian—Bathonian limestones belonging to the Serra de Aire Formation (West-Central Portugal) and is one few sites in world where Middle Jurassic sauropod dinosaur tracks can be found. This characterised by presence long, wide gauge trackways, age which suggests these dinosaurs were more widely distributed over time than previously thought. Two trackways contain unique pes manus prints with morphologies that allow new ichnotaxon described:...

Background The Tapejaridae is a group of unusual toothless pterosaurs characterized by bizarre cranial crests. From paleoecological point view, frugivorous feeding habits have often been suggested for one its included clades, the Tapejarinae. So far, presence these intriguing flying reptiles has unambiguously documented from Early Cretaceous sites in China and Brazil, where pterosaur fossils are less rare fragmentary than similarly-aged European strata. Methodology/Principal Findings...

A feathered skeleton of a Lower Cretaceous enantiornithine bird from Spain indicates that the modified diapsid skull modern birds did not evolve until late in their evolution: Basal retained an essentially primitive design. The fossil provides data clarifying long-standing debates on cranial morphology basalmost bird, Archaeopteryx . It also reemphasizes notion early morphological transformations were focused flight apparatus. This was nestling and suggests postnatal developments those...

Coprolites are some of the most abundant fossils at Las Hoyas site, a well-known Early Cretaceous Konservat-Lagerstätte located in Cuenca, central Spain. The coprolite association is described, introducing taphonomic features and sedimentological properties. This study based on subsample 433 selected from 2000 specimens collected. coprolites show that their integrity, absence desiccation marks, volume congruent with faeces produced deposited an aquatic ecosystem, which were immediately...

New fossil turtle and pterosaurian tracks have been found at the Los Cayos locality (Cornago township, La Rioja province, Spain). The tracksite is situated in Cameros Basin, ant it included Enciso Group, which late Barremian-Early Aptian age (Lower Cretaceous). are formed by parallel isolated digit impressions. Digits show acuminate distal ends relatively blunt proximal margins. Most of three digits, only two them pentadactyl. No trackways can be observed but different track alignments...

The reconstruction of behavioural patterns performed by non-avian dinosaurs is an important task palaeontology in order to globally understand how these animals interacted with their environment. Their relation aquatic lifestyles has always been intriguing question that extensively studied during the last decades, especially focused on some specific groups. present work describes a new tracksite 27 swimming tracks located fluvial setting from Lower Cretaceous Urbion Group La Rioja (Spain)....

Abstract At least nine different dinosaur trackways are known that reveal alternating long and short steps indicative of limping or some other unusual gait. The reasons for such abnormal gaits not clear in most cases, but they may be related to foot injuries, at one example. Most gait patterns have been observed bipedal dinosaurs, also noted the quadrupedal dinosaurs. Measurements trackway a person similar steps, suggest precede emplacement an injured foot, follow. ratio short/long step...

Abstract Pterosaur teeth from the Early Cretaceous Lagerstätte of Las Hoyas (Spain) are described. We reassess track this site previously ascribed to a pterosaur, concluding that it is theropod footprint. The belong two pterodactyloid taxa: basal Istiodactylidae similar Haopterus and an indeterminate Ornithocheiridae. From palaeoecological point view, occurrence such pterosaurs in freshwater wetland palaeobiota strengthens evidence similarity Spanish locality famous Lagerstätten Liaoning China.

ABSTRACT A quadrupedal ornithopod trackway has been discovered at Cabezón de Cameros (La Rioja, Spain). The strata the Valdemayor site is Early Cretaceous in age (probably Hauterivian). formed by five footprints and four manus impressions. Size footprint structure suggest that it produced an iguanodontid dinosaur using a gait. estimated speed 4 km/h. lesser depth of prints suggests center gravity located near hindlimbs. Ornithopod dinosaurs used similar type locomotion both bipedal gaits,...

A dinosaur tracksite has been discovered comprising three types of tridactyl footprints at Regumiel de la Sierra (province Burgos, north‐central Spain). The rocks belong to Lower Cretaceous Wealden deposits the Western Cameros Basin and two ichnological levels 8 trackways several isolated tracks were noted. All are tridactyl, although there types. Level 1 holds a trackway which big iguanodontid dinosaur. 2 yielded 6 Iguanodon‐like morphology, also theropod trackway. One level manus...

The Los Cayos dinosaur tracksite is located at the eastern sector of Cameros Basin (Cornago Township, La Rioja province), NE Spain. sediments consist interbedded terrigenous siliciclastics and carbonates belonging to Enciso Group (Early Cretaceous, Aptian in age). sedimentological faunal evidence suggests that these were deposited a low gradient lacustrine environment. constitutes relatively wide area with least 6 localities have yielded tracks. More than 2,000 tracks been discovered date....

Dinosaur footprints have recently been identified at the Las Hoyas fossil site, renewing interest in its trace fossils as aids interpretation of area's palaeoenvironment and palaeocommunity.The varied tetrapod print morphologies found seem to influenced by contemporaneous presence microbial mats.This paper updates information on traces site describes a new dinosaur trackway containing four tridactyl footprints.Although is not particularly well-preserved, morphology toe marks, heel surface,...