Persona: Pérez García, Adán
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a.perez.garcia@ccia.uned.es
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0000-0002-9074-6855
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Pérez García
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Adán
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Publicación New information on the anatomy and paleobiogeographic and stratigraphic distributions of the British basal turtle Plastremys lata (Helochelydridae) based on its most complete skeleton (lower Albian, Spain)(ELSEVIER, 2025-06-06) Pérez García, Adán; Espílez, E.; Mampel, L.; Cobos, A.The synchronous and sympatric presence of two helochelydrids is reported here for the first time for the Spanish Municipality of Ariño (Teruel Province), where the most complete skeletons from that group had been found for the European record. The presence of two members of this lineage of basal turtles has been documented in very few localities worldwide, and until now consisted of isolated and fragmented remains. Although the lower Albian Aragochersis lignitesta is exclusively documented in this Spanish paleontological area, its material is here identified as the oldest occurrence for the British Plastremys lata, extending the paleobiogeographic distribution range for that taxon. New material from Ariño includes a partial skeleton, as well as isolated remains of several individuals. Their analysis not only shows intraspecific variability, but also documents several anatomical elements previously unknown for Plastremys lata, which was only known from shell remains. Furthermore, the status of the first Mesozoic turtle taxon defined for the Spanish record (i.e., the hitherto problematic ‘Trachyaspis turbulensis’, also from the lower Albian of Teruel) is examined and its holotype, whose original anatomical attribution is here revised, is reattributed to Plastremys lata.Publicación Colaboraciones en Ciencias de la Naturaleza: Tortugas fósiles ibéricas: un viaje de más de 150 millones de años a lomos de este singular grupo de reptiles(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2013-01-01) Pérez García, AdánPublicación 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 The biota of the Upper Cretaceous site of “Lo Hueco” (Cuenca, Spain)(Universidad Complutense de Madrid, 2015-03-25) Ortega Coloma, Francisco Javier; Bardet, N.; Barroso-Barcenilla, F.; Callapez, P.M.; Cambra-Moo, O.; Daviero- Gómez, V.; Díez Díaz, V; Domingo, L.; Elvira, A.; Escaso Santos, Fernando; García-Oliva, M.; Gómez, B.; Houssaye, A.; Knoll, F.; Marcos-Fernández, F.; Martín, M.; Mocho, P.; Narváez Padilla, Iván; Pérez García, Adán; Peyrot, D.; Segura, M.; Serrano, H.; Torices, A.; Vidal, D.; Sanz, J.L.; Ministerio de Ciencia e InnovaciónThe Late Cretaceous (Campanian-Maastrichtian) fossil site of Lo Hueco was recently discovered close to the village of Fuentes (Cuenca, Spain) during the cutting of a little hill for installation of the railway of the Madrid-Levante high-speed train. To date, it has yielded a rich collection of well-preserved Cretaceous macrofossils, including plants, invertebrates, and vertebrates. The recovered fossil assemblage is mainly composed of plants, molluscs (bivalves and gastropods), actinopterygians and teleosteans fishes, amphibians, panpleurodiran (bothremydids) and pancryptodiran turtles, squamate lizards, eusuchian crocodyliforms, rhabdodontid ornithopods, theropods (mainly dromaeosaurids), and titanosaur sauropods. This assemblage was deposited in a near-coast continental muddy floodplain crossed by distributary sandy channels, exposed intermittently to brackish or marine and freshwater flooding as well as to partial or total desiccation events. The Konzentrat-Lagerstatt of Lo Hueco constitutes a singular accumulation of fossils representing individuals of some particular lineages of continental tetrapods, especially titanosaurs, eusuchians and bothremydid turtles. In the case of the titanosaurs, the site has yielded multiple partial skeletons in anatomical connection or with a low dispersion of their skeletal elements. A combination of new taxa, new records of taxa previously known in the Iberian Peninsula, and relatively common taxa in the European record compose the Lo Hueco biota. The particular conditions of the fossil site of Lo Hueco and the preliminary results indicate that the analysis of the geological context, the floral and faunal content, and the taphonomical features of the site provide elements that will be especially useful for reassess the evolutionary history of some lineages of European Late Cretaceous reptiles.Publicación Upper Jurassic sauropod record in the Lusitanian Basin (Portugal): Geographical and lithostratigraphical distribution(Coquina Press, 2017-05-01) Mocho, Pedro; Royo-Torres, Rafael; Escaso Santos, Fernando; Malafaia, Elisabete; Miguel Chaves, Carlos de; Narváez Padilla, Iván; Pérez García, Adán; Pimentel, Nuno; Silva, Bruno C.; Ortega Coloma, Francisco JavierSauropod remains are relatively abundant in the Upper Jurassic sediments of the Lusitanian Basin. These dinosaurs are recorded in several sub-basins formed during the third rifting episode related to the evolution of the Lusitanian Basin. The Kimmeridgian-Tithonian sedimentary sequence is dominated by siliciclastic deposits, indicating a continental environment. Sauropods are present all along this mainly terrestrial sequence, being recorded in the Alcobaça, Praia da Amoreira-Porto Novo, Sobral, Freixial, and the Bombarral Formations, ranging from the early Kimmeridgian to the late Tithonian. Sauropoda is the most abundant dinosaur group in the Upper Jurassic fossil record of the Lusitanian Basin and is especially well-represented in the Bombarral and Turcifal Sub-basins. Several new specimens, so far unpublished, are reported here. The sauropod fauna identified mainly includes non-neosauropod eusauropods (including turiasaurs), diplodocoids (some specimens with diplodocine affinities), basal macronarians (non-camarasaurids and camarasaurids), and titanosauriforms (some specimens with brachiosaurid affinities). Macronarians, turiasaurs and diplodocoids are generally present along the entire Kimmeridgian-Tithonian continental to transitional deposits of the Lusitanian Basin, but the known fossil record for some more exclusive groups such as camarasaurids, brachiosaurids, and diplodocines, present a more restricted stratigraphic distribution.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 New crocodyliforms from southwestern Europe and definition of a diverse clade of European uppermost Cretaceous basal eusuchians(Public Library of Science, 2015-11-04) Narváez Padilla, Iván; Brochu, Christopher A.; Escaso Santos, Fernando; Pérez García, Adán; Ortega Coloma, Francisco Javier; Ministerio de Economía y Competitividad. España; US National Science FoundationThelate Campanian-early Maastrichtian site of Lo Hueco (Cuenca, Spain) has provided a set of well-preserved crocodyliform skull and lower jaw remains, which are described here and assigned to a newbasaleusuchiantaxon, Lohuecosuchus megadontos gen. et sp. nov. The reevaluation of a complete skull from the synchronous site of Fox-Amphoux (Department of Var, France) allows us to define a second species of this new genus. Phylogenetic analysis places Lohuecosuchus in a clade exclusively composed by European Late Cretaceous taxa. This new clade, defined here as Allodaposuchidae, is recognized as the sister group of Hylaeochampsidae, also comprised of European Cretaceous forms. Allodaposuchidae and Hylaeochampsidae are grouped in aclade identified as the sister group of Crocodylia, the only crocodyliform lineage that reaches our days. Allodaposuchidae shows avicariant distribution pattern in the European Late Cretaceous archipelago, with several Ibero-Armorican forms more closely related to each other than with to Romanian Allodaposuchus precedens.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.