Francisco Ortega

ORCID: 0000-0002-7431-354X
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About
Contact & Profiles
Research Areas
  • Paleontology and Evolutionary Biology
  • Evolution and Paleontology Studies
  • Ichthyology and Marine Biology
  • Paleontology and Stratigraphy of Fossils
  • Amphibian and Reptile Biology
  • Archaeological and Geological Studies
  • Turtle Biology and Conservation
  • Pleistocene-Era Hominins and Archaeology
  • Morphological variations and asymmetry
  • Mediterranean and Iberian flora and fauna
  • Archaeological and Historical Studies
  • Fish biology, ecology, and behavior
  • Geological formations and processes
  • Space Exploration and Technology
  • Plant Diversity and Evolution
  • Biomimetic flight and propulsion mechanisms
  • Cephalopods and Marine Biology
  • Plant Pathogens and Fungal Diseases
  • Lichen and fungal ecology
  • Building materials and conservation
  • Optical measurement and interference techniques
  • Fern and Epiphyte Biology
  • Subterranean biodiversity and taxonomy
  • Architecture, Art, Education
  • Spider Taxonomy and Behavior Studies

National University of Distance Education
2016-2025

Yangon University Of Distance Education
2018-2025

Direção Geral do Património Cultural
2013-2023

Sociedade de História Natural
2011-2023

Centro Interuniversitário de História das Ciências e da Tecnologia
2017-2021

Universidad Complutense de Madrid
2019

Google (United States)
2018

University of Nariño
2016

Universidad Nacional de Colombia
2015

Universidad Autónoma de Madrid
1994-2006

Background Sauropod dinosaurs were the largest animals ever to walk on land, and, as a result, evolution of their remarkable adaptations has been great interest. The braincase is particular interest because it houses brain and inner ear. However, only few studies these structures in sauropods are available date. Because phylogenetic position Spinophorosaurus nigerensis basal eusauropod, potential provide key evidence evolutionary transition relative other dinosaurs. Methodology/Principal...

10.1371/journal.pone.0030060 article EN cc-by PLoS ONE 2012-01-17

ABSTRACT A new species of the genus Araripesuchus from Albian-Cenomanian locality El Chocón (Neuquén Province, Argentina) is described. The diagnosis reviewed and its phylogenetic placement within Crocodylomorpha discussed. proposed here as being sister taxon Neosuchia, corroborating previous analysis. species, patagonicus, differs type A. gomesii in relationships prefronto-nasal lachrymo-nasal sutures, dermal postorbital bar on medial side jugal, greater extension squamosals skull dorsum....

10.1671/0272-4634(2000)020[0057:ansoac]2.0.co;2 article EN Journal of Vertebrate Paleontology 2000-04-17

Background The early evolution of sauropod dinosaurs is poorly understood because a highly incomplete fossil record. New discoveries Early and Middle Jurassic sauropods have great potential to lead better understanding reevaluate the patterns diversification. Principal Findings A new from Niger, Spinophorosaurus nigerensis n. gen. et sp., most complete basal currently known. taxon shares many anatomical characters with East Asian sauropods, while it strongly dissimilar Lower South American...

10.1371/journal.pone.0006924 article EN cc-by PLoS ONE 2009-09-16

The late Campanian-early Maastrichtian site of Lo Hueco (Cuenca, Spain) has provided a set well-preserved crocodyliform skull and lower jaw remains, which are described here assigned to new basal eusuchian taxon, Lohuecosuchus megadontos gen. et sp. nov. reevaluation complete from the synchronous Fox-Amphoux (Department Var, France) allows us define second species this genus. Phylogenetic analysis places in clade exclusively composed by European Late Cretaceous taxa. This clade, defined as...

10.1371/journal.pone.0140679 article EN public-domain PLoS ONE 2015-11-04

The Late Cretaceous (Campanian-Maastrichtian) fossil site of Lo Hueco was recently discovered close to the village Fuentes (Cuenca, Spain) during cutting a little hill for installation railway Madrid-Levante high-speed train. To date, it has yielded rich collection well-preserved macrofossils, including plants, invertebrates, and vertebrates. recovered assemblage is mainly composed molluscs (bivalves gastropods), actinopterygians teleosteans fishes, amphibians, panpleurodiran (bothremydids)...

10.5209/rev_jige.2015.v41.n1.48657 article EN cc-by Journal of Iberian Geology 2015-05-08

ABSTRACT This paper describes the skull of Allodaposuchus precedens Nopcsa, 1928 and provides first complete diagnosis species. The description holotype, which comes from Upper Cretaceous deposits Valioara in Hateg Basin Romania (Late Maastrichtian), is included with those other undescribed specimens uppermost Spain southern France. All preserve same anatomical region as holotype provide new relevant information on genus its phylogenetic position. context A. discussed a recent cladistic...

10.1671/0272-4634(2001)021[0074:arotca]2.0.co;2 article EN Journal of Vertebrate Paleontology 2001-03-26

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...

10.1126/science.276.5318.1543 article EN Science 1997-06-06

Lourinhasaurus alenquerensis is a Portuguese Upper Jurassic dinosaur whose lectotype one of the most complete sauropod specimens from fossil record and Europe. It was recovered sediments Sobral Formation (upper Kimmeridgian to lower Tithonian) at Moinho do Carmo (Alenquer, Portugal). The first related Apatosaurus then tentatively Camarasaurus. Finally, it established as new taxon, Lourinhasaurus, including specimen. At time writing, had poor diagnosis an unstable phylogenetic position....

10.1111/zoj.12113 article EN Zoological Journal of the Linnean Society 2014-02-19

A new styracosternan ornithopod genus and species is here described based on a partial postcranial skeleton an associated dentary tooth of single specimen from the Arcillas de Morella Formation (Early Cretaceous, late Barremian) at locality, (Castellón, Spain). Morelladon beltrani gen. et sp. nov. diagnosed by eight autapomorphic features. The set autapomorphies includes: very elongated vertical neural spines dorsal vertebrae, midline keel ventral surface second to fourth sacral vertebrae...

10.1371/journal.pone.0144167 article EN cc-by PLoS ONE 2015-12-16

Abstract Testudines are one of the best‐represented taxonomic groups among Paleogene taxa Duero Basin (Castile and Leon Autonomous Community, central Spain). Among them, Neochelys (Podocnemidide) Allaeochelys (Carettochelyidae) most abundant, allowing population to be assessed for osteological anomalies. The abundance postcranial remains both allows us identify several individuals with potential anomalies, mostly in their shells. Some them have already been described previous studies, but...

10.1002/ar.25443 article EN cc-by-nc-nd The Anatomical Record 2024-04-12

The sauropod hind limb was the main support that allowed their gigantic body masses and a wide range of dynamic stability adaptations. It closely related to position centre multi-ton barrel-shaped bodies, experienced one most noticeable posture changes during macronarian evolution. Deeply branched macronarians achieved increasingly arched limbs in what is known as wide-gauge posture. However, it not clear if this evolutionary trend cascade toward gigantism even though some titanosaurians...

10.7554/elife.92498.2 preprint EN 2025-02-21

The Konzentrat-Lagerstätteof ‘Lo Hueco’ in Central Spain represents an extremely rich and diverse upper Campanian-lower Maastrichtian fossil assemblage comprising more than 10,000 remains: This has made it, recent years, one of the most relevant European sites for study continental vertebrate faunas. stratigraphic succession is primarily characterized by six levels separated transitional boundaries green (V), grey (G1), red (R1), (G2), (R2) brown (M) beds marly...

10.5194/egusphere-egu25-19127 preprint EN 2025-03-15

Abstract This special volume, “New Paleontological Research in Turtles and other Vertebrates”, pays tribute to the Spanish Researcher Dr. Emiliano Jiménez Fuentes, who passed away December 2021. His role was fundamental for development of studies on vertebrate faunas Eocene Duero Basin, as well creation Collection Fossil Vertebrates Basin (“Sala de las Tortugas” University Salamanca), which houses more than 25,000 specimens vertebrates, including about 20 holotypes mammals reptiles. Since...

10.1002/ar.25658 article EN The Anatomical Record 2025-03-17
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