Persona: Pérez García, Adán
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Pérez García
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Publicación A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain)(Wiley, 2024-03-05) Narváez Padilla, Iván; Celis, Ane de; Escaso Santos, Fernando; Martín de Jesús, Santiago; Pérez García, Adán; Ortega Coloma, Francisco JavierThe eusuchian crocodyliforms recorded in the Eocene levels of the Spanish Duero Basin belong to three lineages: Planocraniidae, with the species Duerosuchus piscator; Alligatoroidea, represented by several specimens of the genus Diplocynodon; and Crocodyloidea, which includes several specimens traditionally attributed to Asiatosuchus. The genus Asiatosuchus, established in 1940 based on a middle Eocene species from Mongolia, has subsequently served as a wastebasket taxon for Paleogene remains belonging to several species, not only from Asia but also belonging to the European and North American records. Many of these species are known by highly fragmentary remains, sharing the presence of characters such as a flat and triangular skull, and long symphyses in the lower jaw, recognized as characteristic for the crocodyloids. In addition to isolated cranial remains, among the material traditionally attributed to Asiatosuchus at the Duero Basin stands out a nearly complete skull and a left mandible, from the middle Eocene area of Casaseca de Campeán (Zamora Province). The present study analyses in detail these specimens, previously reported during the 1980s, but analyzed in a very preliminary way. They are included for the first time in a phylogenetic analysis to establish the systematic position of this Spanish form. The results confirm that it corresponds to a new species of basal crocodyloid, defined here as Asiatosuchus oenotriensis sp. nov.Publicación New data on the shell anatomy of Selenemys lusitanica, the oldest known pleurosternid turtle in Europe(Springer, 2024) Pérez García, Adán; Camilo, Bruno; Ortega Coloma, Francisco JavierOne of the most diverse turtle lineages in the Upper Jurassic and Lower Cretaceous record of Europe is that of the stem turtles Pleurosternidae (Paracryptodira), also distributed in North America. The oldest European representative of this lineage is the Portuguese Selenemys lusitanica, known from upper Kimmeridgian to lower Tithonian levels (Late Jurassic). The information on the shell of this taxon is so far very limited, being exclusively restricted to that provided in the publication in which the taxon was defined. New specimens from several upper Kimmeridgian to Tithonian localities in the Consolação Sub-basin of the Portuguese Lusitanian Basin, both from the Leiria District and the Lisbon District, are studied here. They include the most complete shell of the species found so far, as well as several isolated plates that allow us to improve knowledge about it. Thus, new information about the shell anatomy of Selenemys lusitanica is provided, but also about its intraspecific variability.Publicación A turtle from northeastern Spain reveals that the dispersal of Pelomedusoides from Gondwana to Laurasia probably occurred in the Early Cretaceous(ELSEVIER, 2024) Pérez García, Adán; Rubio, CristóbalA turtle carapace, identified as Algorachelus cf. peregrina (Pleurodira, Pelomedusoides, Bothremydidae), is reported here from the shallow marine deposits of the Boundary Marls Unit (Utrillas Group), in Estercuel (Teruel Province, northeastern Spain). These levels are identified as deposited during the Lower to Upper Cretaceous transition (late Albian to earliest Cenomanian). This is the oldest record of a bothremydid turtle in Laurasia, documenting that the first dispersal of pelomedusoid turtles from Gondwana to Laurasia occurred earlier than previously identified, most probably in the Early Cretaceous. Pleurodiran turtles always require warm climatic conditions and are mainly freshwater forms. This dispersal was favored by climate change (global warming) that began in the Albian, as well as by the habitat change of the Algorachelus lineage from freshwater to coastal marine environments.Publicación A pan-cheloniid turtle from the Middle Miocene of Portugal(Wiley, 2024) Pérez García, Adán; Telles Antunes, MiguelCurrently, there is no information on the fossil record of Pan-Cheloniidae from the Neogene of the Iberian Peninsula. A well-preserved partial skeleton attributable to this lineage of turtles, from the Middle Miocene of Portugal, is presented here. It preserves much of the anterior half of its carapace, in which the plates remain articulated, as well as several articulated dorsal vertebrae, and an isolated cervical and a caudal vertebrae. The analysis of this Serravallian find shows that it cannot be attributed to a hitherto described taxon. Thus, a new member of Pan-Cheloniidae is defined, Lusochelys emilianoi gen. et sp. nov., improving the relatively limited knowledge about this lineage for the Middle Miocene global record. It represents the first generic and specific systematic attribution for a member of Pan-Chelonioidea in the Neogene record of the Iberian Peninsula.Publicación A bothremydid turtle (Pleurodira) from the middle Cenomanian of Vale de Figueira (Belas, Portugal)(Wiley, 2024) Telles Antunes, Miguel; Pérez García, AdánAn unpublished turtle shell from the middle Cenomanian of Vale de Figueira, near Belas (Lisbon District, Portugal), is recognized by us as collected in 1880 under the direction of Carlos Ribeiro. No turtle remains from that region had so far been figured, described or discussed from a systematic point of view. The specimen corresponds to a partial but articulated shell. It is attributed to Pleurodira and, more specifically, to Bothremydidae. Only one pre-Campanian turtle specimen was previously identified at the infrafamilial level in the Cretaceous record of Portugal. It was a partial shell from the middle Cenomanian of Nazaré (Leiria District) attributed to the bothremydid Algorachelus peregrina, a species defined in a Spanish synchronous locality (Algora, in Central Spain). Several anatomical regions in the specimen from Vale de Figueira were not preserved in the partial carapace from Nazaré, and differences in the morphology of some elements are recognized between both shells. However, the individual studied here is also ascribed to Algorachelus peregrina, these differences being justified by intraspecific variability. Therefore, the specimen represents the second evidence on the species in Portugal, being the only one recognized for the Lisbon District.Publicación Sauropterygian remains from the Middle Triassic of Araif El-Naqa as the first identification of Simosauridae (Eosauropterygia) in Egypt(Elsevier, 2024-11-30) Cabezuelo Hernández, Alberto; de Miguel Chaves, Carlos; Pérez García, AdánSimosauridae is a Triassic eosauropterygian clade restricted to the western Paleotethys. It is known by relatively abundant cranial and postcranial elements coming mostly from European localities, where the type species, Simosaurus gaillardoti, from the Ladinian (Middle Triassic) of France and Germany, and the recently defined Paludidraco multidentatus, from the Carnian (Late Triassic) of Spain are known, in addition to several simosaurids of undetermined generic and specific attribution. By contrast, it is poorly represented in the Middle East, being known from both Israel and Saudi Arabia by scarce remains of uncertain systematic attribution. The Middle Triassic deposits of Araif El-Naqa, in Egypt, have yielded several sauropterygian remains, so far attributable to the placodont taxa Psephosauriscus sinaiticus and Psephosauriscus rhombifer, as well as to indeterminate nothosaurs. Here, we describe several unpublished vertebral sauropterygian remains from Araif El-Naqa, identifying the presence of the clade Simosauridae for the first time in Egypt and the first simosaurid vertebral remains from the Eastern Mediterranean.