Ignacio A. Cerda
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View article: Latest Cretaceous megaraptorid theropod dinosaur sheds light on megaraptoran evolution and palaeobiology
Latest Cretaceous megaraptorid theropod dinosaur sheds light on megaraptoran evolution and palaeobiology Open
Recent fossil discoveries have cast considerable light on the palaeobiology of Megaraptora, a group of large-clawed carnivorous theropod dinosaurs known from Cretaceous deposits in Asia, Australia, and especially South America. Nevertheles…
View article: Dental plate histology of †<i>Ischyodus dolloi</i> (Chondrichthyes, Holocephali), from Antarctica
Dental plate histology of †<i>Ischyodus dolloi</i> (Chondrichthyes, Holocephali), from Antarctica Open
In contrast to other cartilaginous fishes (Chondrichthyes), the dentition of the Holocephali consists of six dental plates, four in the upper jaw (two vomerines and two palatines) and two in the lower jaw (mandibulars). While the microstru…
View article: A fast start: Evidence of rapid growth in <i>Trialestes romeri</i>, an early Crocodylomorpha from the Upper Triassic continental beds of Argentina based on osteohistological analyses
A fast start: Evidence of rapid growth in <i>Trialestes romeri</i>, an early Crocodylomorpha from the Upper Triassic continental beds of Argentina based on osteohistological analyses Open
The palaeobiology aspects of early Crocodylomorpha during their origin in the Triassic are poorly known, despite occupying an important palaeoecological role in continental environments. In this study, we report the microstructural feature…
View article: Life history and growth dynamics of a peirosaurid crocodylomorph (Mesoeucrocodylia; Notosuchia) from the Late Cretaceous of Argentina inferred from its bone histology
Life history and growth dynamics of a peirosaurid crocodylomorph (Mesoeucrocodylia; Notosuchia) from the Late Cretaceous of Argentina inferred from its bone histology Open
Notosuchia were a successful lineage of Crocodyliformes that achieved a remarkable diversity during the Cretaceous of Gondwana, particularly in South America. Although paleohistology has expanded our knowledge of the paleobiology of notosu…
View article: A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria
A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria Open
Gondwanan dinosaur faunae during the 20 Myr preceding the Cretaceous–Palaeogene (K/Pg) extinction included several lineages that were absent or poorly represented in Laurasian landmasses. Among these, the South American fossil record conta…
View article: First record of palaeopathologies on appendicular bones of the Triassic pseudosuchians Erpetosuchidae and Aetosauria based on microstructural approaches
First record of palaeopathologies on appendicular bones of the Triassic pseudosuchians Erpetosuchidae and Aetosauria based on microstructural approaches Open
Ponce, Denis A., Cerda, Ignacio A., Desojo, Julia B. (2024): First record of palaeopathologies in appendicular bones of the Triassic pseudosuchians Erpetosuchidae and Aetosauria based on microstructural approaches. Acta Palaeontologica Pol…
View article: Palaeobiological inferences of “rauisuchians” <i>Fasolasuchus tenax</i> (Los Colorados Fm., Argentina) and <i>Prestosuchus chiniquensis</i> (Santa Maria Super sequence, Brazil) from the Middle–Upper Triassic of South America based on microstructural analyses
Palaeobiological inferences of “rauisuchians” <i>Fasolasuchus tenax</i> (Los Colorados Fm., Argentina) and <i>Prestosuchus chiniquensis</i> (Santa Maria Super sequence, Brazil) from the Middle–Upper Triassic of South America based on microstructural analyses Open
“Rauisuchia” is a non‐monophyletic group of quadrupedal and carnivorous pseudosuchians that inhabited the entire world during the Middle–Upper Triassic period (Anisian/Ladinian–Rhaetian). In South America, “rauisuchians” reached the larges…
View article: Palaeohistology reveals an unusual periodontium and tooth implantation in a filter‐feeding pterodactyloid pterosaur, <i>Pterodaustro guinazui</i>, from the Lower Cretaceous of Argentina
Palaeohistology reveals an unusual periodontium and tooth implantation in a filter‐feeding pterodactyloid pterosaur, <i>Pterodaustro guinazui</i>, from the Lower Cretaceous of Argentina Open
Pterosaurs are an extinct group of Mesozoic flying reptiles, which exhibited high diversity with regard to their dentition. Although morphological features of pterosaur dentition have been described in detail in several contributions, the …
View article: Palaeobiology of the early sauropodomorph <i>Mussaurus patagonicus</i> inferred from its long bone histology
Palaeobiology of the early sauropodomorph <i>Mussaurus patagonicus</i> inferred from its long bone histology Open
We present a detailed histological study of long bones from an ontogenetic series of Mussaurus patagonicus , an early sauropodomorph from the Lower Jurassic of Argentina. Twenty long bones, including humeri, femora and fibulae, obtained fr…
View article: Dental histology and attachment tissues in <i>Notosuchus terrestris</i> (Crocodyliformes, Notosuchia): palaeobiological implications
Dental histology and attachment tissues in <i>Notosuchus terrestris</i> (Crocodyliformes, Notosuchia): palaeobiological implications Open
Notosuchia represents a highly diverse lineage of Crocodyliformes usually characterized by the presence of a heterodont dentition. Although the dental anatomy has been thor-oughly analysed in some taxa, information regarding tooth microstr…
View article: Osteohistology of the hyperelongate hemispinous processes of <i>Amargasaurus cazaui</i> (Dinosauria: Sauropoda): Implications for soft tissue reconstruction and functional significance
Osteohistology of the hyperelongate hemispinous processes of <i>Amargasaurus cazaui</i> (Dinosauria: Sauropoda): Implications for soft tissue reconstruction and functional significance Open
Dicraeosaurid sauropods are iconically characterized by the presence of elongate hemispinous processes in presacral vertebrae. These hemispinous processes can show an extreme degree of elongation, such as in the Argentinean forms Amargasau…
View article: Palaeobiological inferences of the aetosaur <i>Aetosauroides scagliai</i> (Archosauria: Pseudosuchia) based on microstructural analyses of its appendicular bones
Palaeobiological inferences of the aetosaur <i>Aetosauroides scagliai</i> (Archosauria: Pseudosuchia) based on microstructural analyses of its appendicular bones Open
Aetosaurs were a group of armoured pseudosuchians, recorded in most of the Upper Triassic continental deposits worldwide. Several osteohistological contributions of aetosaurs focused on their osteoderms, but rarely on appendicular bones. H…
View article: First osteohistological and histotaphonomic approach of Equus occidentalis Leidy, 1865 (Mammalia, Equidae) from the late Pleistocene of Rancho La Brea (California, USA)
First osteohistological and histotaphonomic approach of Equus occidentalis Leidy, 1865 (Mammalia, Equidae) from the late Pleistocene of Rancho La Brea (California, USA) Open
Rancho La Brea (California, USA) is the most emblematic Quaternary fossiliferous locality in the world, since both the high number and diversity of the specimens recovered and their excellent preservational quality. In the last decades, pa…
View article: Bone histology of human remains from the Late Holocene of Northwestern Patagonia, Argentina: a multidimensional taphonomic approach
Bone histology of human remains from the Late Holocene of Northwestern Patagonia, Argentina: a multidimensional taphonomic approach Open
Fil: Vazquez, Romina Clara. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina.
View article: A Late Cretaceous dinosaur and crocodyliform faunal association–based on isolate teeth and osteoderms–at Cerro Fortaleza Formation (Campanian-Maastrichtian) type locality, Santa Cruz, Argentina
A Late Cretaceous dinosaur and crocodyliform faunal association–based on isolate teeth and osteoderms–at Cerro Fortaleza Formation (Campanian-Maastrichtian) type locality, Santa Cruz, Argentina Open
The Late Cretaceous dinosaur record in southern South America has been improved recently; particularly with findings from Chorrillo and Cerro Fortaleza formations, both bearing ankylosaur remains, a clade that was not previously recorded i…
View article: Osteohistology and paleobiological inferences of proterochampsids (Eucrocopoda: Proterochampsia) from the Chañares Formation (late Ladinian–early Carnian), La Rioja, Argentina
Osteohistology and paleobiological inferences of proterochampsids (Eucrocopoda: Proterochampsia) from the Chañares Formation (late Ladinian–early Carnian), La Rioja, Argentina Open
Proterochampsids were a group of stem archosaurs from the Middle–Late Triassic of South America. Using for the first time in proterochampsids quantitative microanatomical and morphological data and an inference model, we analyze the micros…
View article: Osteohistology and paleobiological inferences of proterochampsids (Eucrocopoda: Proterochampsia) from the Chañares Formation (late Ladinian–early Carnian), La Rioja, Argentina
Osteohistology and paleobiological inferences of proterochampsids (Eucrocopoda: Proterochampsia) from the Chañares Formation (late Ladinian–early Carnian), La Rioja, Argentina Open
Proterochampsids were a group of stem archosaurs from the Middle–Late Triassic of South America. Using for the first time in proterochampsids quantitative microanatomical and morphological data and an inference model, we analyze the micros…
View article: The evolution of dermal shield vascularization in Testudinata and Pseudosuchia: phylogenetic constraints versus ecophysiological adaptations
The evolution of dermal shield vascularization in Testudinata and Pseudosuchia: phylogenetic constraints versus ecophysiological adaptations Open
Studies on living turtles have demonstrated that shells are involved in the resistance to hypoxia during apnea via bone acidosis buffering; a process which is complemented with cutaneous respiration, transpharyngeal and cloacal gas exchang…
View article: Growth dynamics and body size evolution of South American long-necked chelid turtles: a bone histology approach.
Growth dynamics and body size evolution of South American long-necked chelid turtles: a bone histology approach. Open
Among turtles, cases of "gigantism" occur mostly in pleurodiran Pelomedusoides and cryptodirans, but are infrequent among pleurodiran chelids, which are mostly small-medium sized turtles.Yaminuechelys spp.are extinct South American long-ne…
View article: Osteohistological correlates of muscular attachment in terrestrial and freshwater Testudines
Osteohistological correlates of muscular attachment in terrestrial and freshwater Testudines Open
Sharpey's fibers are considered the anatomical structures integrated to the muscles. Since these fibers leave marks at the microscopic level, their presence and distribution are used as evidence of muscle attachment in extinct and extant f…
View article: A new ornithopod dinosaur from the Santonian of Northern Patagonia (Rincón de los Sauces, Argentina)
A new ornithopod dinosaur from the Santonian of Northern Patagonia (Rincón de los Sauces, Argentina) Open
Fil: Cruzado Caballero, Penélope. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
View article: Novel data on aetosaur (Archosauria, Pseudosuchia) osteoderm microanatomy and histology: palaeobiological implications
Novel data on aetosaur (Archosauria, Pseudosuchia) osteoderm microanatomy and histology: palaeobiological implications Open
One of the most striking features of aetosaurs is the possession of an extensive bony armour composed of dorsal, ventral and appendicular osteoderms. With the purpose of establishing the main histological changes during ontogeny and the de…
View article: Postcranial skeletal anatomy of the holotype and referred specimens of<i>Buitreraptor gonzalezorum</i>Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia
Postcranial skeletal anatomy of the holotype and referred specimens of<i>Buitreraptor gonzalezorum</i>Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia Open
Here we provide a detailed description of the postcranial skeleton of the holotype and referred specimens of Buitreraptor gonzalezorum . This taxon was recovered as an unenlagiine dromaeosaurid in several recent phylogenetic studies and is…
View article: Postcranial skeletal anatomy of the holotype and referred specimens of <i>Buitreraptor gonzalezorum</i> Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia
Postcranial skeletal anatomy of the holotype and referred specimens of <i>Buitreraptor gonzalezorum</i> Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia Open
Here we provide a detailed description of the postcranial skeleton of the holotype and referred specimens of Buitreraptor gonzalezorum . This taxon was recovered as a unenlagiine dromaeosaurid in several recent phylogenetic studies and is …