Concavenator

Abstract: An isolated, fully articulated hindlimb of a basal iguanodont from the Spanish Las Hoyas Lagerstatte is described. It probably belonged to a juvenile or subadult individual. Despite some slight differences, anatomical features, as well as the late Barremian age of this specimen, would suggest that it belongs to Mantellisaurus atherfieldensis. The exquisite preservation of this specimen provides information on the foot anatomy of basal iguanodonts. This is the first report of a non-theropod dinosaur from Las Hoyas. From a palaeoecological point of view, this discovery indicates that potential prey of the carcharodontosaurian theropod Concavenator were present at Las Hoyas, thus complementing our knowledge of the trophic structure of this Early Cretaceous palaeocommunity.

Abstract: Four isolated archosaur teeth from Las Hoyas (Cuenca province, Central Spain), one ziphodont and three conical, are described. Current evidence suggests their identification as a carcharodontosaurid akin to Concavenator and a putative spinosaurid theropods, and to a goniopholidid neosuchian based on data from morphology and morphometry, and internal structure. The results of Bivariant Discriminant, and Cluster analysis places the conical teeth between the morphology of Spinosauridae, Pholidosauridae and Goniopholididae, but closer to the last one. However, the internal structure suggests distinct dinosaurian and crocodilian construction, and is proposed as a valid, diagnostic feature possibly able to discriminate between the highly convergent teeth of these lineages. Thus, these findings might represent the second carcharodontosaurid and the first spinosaurid specimens from La Huerguina Fm. (late Barremian, 127 MYA, Lower Cretaceous), and suggest the presence of larger sized crocodilian species than those currently identified by complete skeletal remains.

Abstract: An isolated, fully articulated hindlimb of a basal iguanodont from the Spanish Las Hoyas Lagerstatte is described. It probably belonged to a juvenile or subadult individual. Despite some slight differences, anatomical features, as well as the late Barremian age of this specimen, would suggest that it belongs toMantellisaurus atherfieldensis .T he exquisite preservation of this specimen provides information on the foot anatomy of basal iguanodonts. This is the first report of a non-theropod dinosaur from Las Hoyas. From a palaeoecological point of view, this discovery indicates that potential prey of the carcharodontosaurian theropod Concavenator were present at Las Hoyas, thus complementing our knowledge of the trophic structure of this Early Cretaceous palaeocommunity.