Ignacio A. Cerda's research while affiliated with Universidad Nacional de Río Negro and other places

Publications (38)

Article
Pellegrinisaurus powelli is a large titanosaurian sauropod from the Upper Cretaceous of northern Patagonia (Río Negro Province, Argentina). The holotype of this species comprises an incomplete femur, four dorsal and 26 caudal vertebrae collected from the Lago Pellegrini locality. A single middle caudal vertebra from the nearby Cinco Saltos locality...
Article
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The Caribbean islands are one of the most important hotspots of endemism and biodiversity globally, and the scenario of unique examples of biological radiations. Although our knowledge of the current and recently extinct diversity in the area is strong, the origin and evolution of most groups in the region remain obscure because of the absence of f...
Article
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This study presents the first histological results on human remains recovered from Late Holocene archaeological sites from Northwestern Patagonia, Argentina, from a multidimensional taphonomic perspective. The burial sites come from different geoenvironmental contexts. The main purpose of this work is to assess the influence of geoenvironmental fac...
Article
The paleopathological record provides relevant information about paleobiology and paleoecology of fossil organisms. Based on the information obtained from paleopathologies, it is possible to infer how these injuries affected inter- and intraspecific relationships among organisms, and their interaction with the environment. For instance, fractures a...
Article
The origin and homology of the turtle shell is one of the most captivating topics in amniote evolution. In this contribution, we present a new species of turtle from the Late Triassic of Argentina whose peripheral plates raise questions about the homology of these bones in turtles. The external morphology of the peripheral plates of Waluchelys cavi...
Article
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Megamammals constituted an important component in the Pleistocene faunal communities of South America. Paleobiological and paleoecological studies involving different megamammal taxa have increased significantly in the last years, but there are still several poorly-known issues of its life history. In this work, we analyze an assemblage composed of...
Article
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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 exchanges in the soft-shell turtles. Bone acidosis buffering during apnea has also been identified in crocodylian oste...
Article
Extant turtles exhibit a range of ecological adaptations to terrestrial and pelagic marine habitats. Bone shell microanatomy, and specifically, qualitative and quantitative approaches to shell bone porosity, have been used to infer palaeoecology and habitat. However, such inferences are hindered by the lack of a comprehensive sampling of testudine...
Article
Osteohistological studies provide information on the life history of extant and extinct vertebrates, such as growth dynamics, age, body size, sexual maturity, sexual dimorphism, soft tissues, among others aspects. In this work, we evaluate the histological changes occurred during the ontogeny of extant representatives of plains vizcacha, Lagostomus...
Article
A detailed histological study of Antarctopelta oliveroi, from the Upper Cretaceous of Antarctica, is performed in order to increase our knowledge of the ankylosaur bone histology and its taxonomical and paleobiological implications. The main goals of this contribution are: to infer the ontogenetic stage of the holotype of Antarctopelta oliveroi (ML...
Article
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 forms. In recent years, studies have been focusing on muscle–bone and tendon–bone interaction mostly on mammals....
Article
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Globuli ossei are subspherical structures of endochondral origin that are inserted in the hypertrophic cartilage of long bones, and are related to paedomorphic phenomena. These structures are here described for the first time in Aves, concretely in a postcranial bone of an extinct Spheniciformes from Antarctica (Delphinornis arctowskii). Although i...
Article
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Dinosaurs dominated the terrestrial ecosystems for more than 140 Myr during the Mesozoic era, and among them were sauropodomorphs, the largest land animals recorded in the history of life. Early sauropodomorphs were small bipeds, and it was long believed that acquisition of giant body size in this clade (over 10 tonnes) occurred during the Jurassic...
Article
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La obtención de cortes delgados de restos óseos correspondiente tanto a materiales fósiles como arqueológicos suele ser una tarea poco sencilla, lo cual conlleva generalmente un elevado costo y tiempos prolongados. Por otra parte, la formación de un laboratorio con las características necesarias para la realización de protocolos ya establecidos es...
Article
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 degree of histological variation within the armour, we analysed the bone histology of dorsal (paramedian and late...
Article
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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 the best represented Gondwanan dromaeosaurid discovered to date. It was preliminarily described in a brief art...
Data
Selected measurements of the postcranial bones of the holotype and referred specimens of Buitreraptor gonzalezorum.
Article
The long-necked chelid turtle Yaminuechelys aff. maior is described on the basis of post-cranial material of two specimens from the Lower–Middle Campanian Anacleto Formation,nortwestern Patagonia (Argentina). These post-cranial remains are described macro-scopically (external morphology) and microscopically (histological sections of the shell).Alth...
Conference Paper
Full-text available
bone histology of the turtle shell (carapace and plastron): implications for turtle systematics, functional morphology, and turtle origins. Ph.D. Thesis, Sobre la base de recientes análisis filogenéticos morfológicos (Bona y de la Fuente, 2005) donde las especies de los géneros Yaminuechelys de la Fuente, Lapparent de Broin y Manera de Bianco e Hyd...
Data
Resumen. Se describen osteodermos de un nuevo ejemplar de crocodyliforme hallado en un afloramiento correspondiente a niveles de la Formación Plottier (Coniaciano tardío) de la localidad de Puesto Hernández, en inmediaciones de la localidad de Rincón de los Sauces, Pro-vincia del Neuquén. Los osteodermos estudiados, que son parte del material halla...
Article
Se describen los restos de al menos dos saurópodos titanosaurios asociados (MAU-Pv-LJ-471 y 472), los cuales provienen de niveles asignados a la Formación Plottier (Cretácico Superior), aflorantes en cercanía de Rincón de los Sauces, Neuquén. Entre los materiales recuperados se encuentran: dos vértebras dorsales probablemente anteriores (una de men...

Citations

... Indeed, these also exhibit Sharpey's fibers on the external surface, indicating that the deep implantation of osteoderms could be a general feature of notosuchians. Furthermore, the carapace plates of some fully aquatic turtles, especially the Trionychidae, are covered with thick dermal tissue which, along with the cambial and cornified layers of the epidermis, constitutes a tough, though flexible, protection (Alibardi & Toni, 2006;Cherepanov, 1995;Scheyer & Cerda, 2021;Scheyer et al., 2007). The basal cortex of Tryonyx triunguis or Tryonyx spiniferus plates typically consists of an orthogonal plywood-like system with regularly arranged horizontal and vertical fiber bundles (a geometric pattern much more regular than in Iberosuchus). ...
... This pattern is based on the abundance and accessibility of Cenozoic strata and the greater efforts of local and national institutions to collect material from them. On the other hand, specimens recovered from Mesozoic sediments are less common but offer a unique window into the fauna that inhabited the western portion of the Tethys Sea in the Late Jurassic (Iturralde--Vinent and Ceballos-Izquierdo, 2015) and the biota present in the early stages of the Caribbean in the Late Cretaceous Viñola-López et al., 2022). ...
... However, they assigned it to Colossosauria due to the absence of Saltasaurinae and Aeolosaurini synapomorphies and because this species has a humerus with minimum mediolateral width divided by proximodistal length less than 0.15 and deltopectoral crest with mediolateral thickness of anterior attachment surface with distal half mediolaterally expanded relative to proximal half. Cerda et al. (2021) included Nullotitan in a large data matrix and recovered this taxon as more closely related to Pellegrinisaurus, forming with Alamosaurus and Baurutitan, a clade that is the sister group of Saltasauridae (equally weighted analysis) or in a more basal position, being the sister species of the monophyletic group composed of Saltasauridae and the group comprising Baurutitan, Pellegrinisaurus, Alamosaurus, and Trigonosaurus (implied weighted analysis). In both cases, Nullotitan is not recovered as a Colossosauria as originally proposed by Novas et al. (2019). ...
... Moreover, recent histological studies of Antarctic Campanian-Maastrichtian ornithischians (i.e., elasmarians and ankylosaurs) indicate that the growth patterns of these high latitude (> 60 • S) taxa were similar to those of related forms from Patagonia. This, in turn, suggests that the distribution of Gondwanan ornithopods was not strongly influenced by physiological aspects and that these animals were adapted to cope with significant temperature variations throughout the year (see Cerda et al., 2019;Garcia-Marsà et al., 2020). Interestingly, the only other herbivorous dinosaurs that unquestionably shared the Patagonian latest Cretaceous paleoenvironment with ornithopods were ankylosaurs and titanosaurs (seemingly the only sauropods to survive to the end of the Cretaceous worldwide), suggesting that these groups of animals may not have directly competed for resources and niches available at that time (Coria, 2011). ...
... The histology of long bones of turtles has been studied since the 19th century (e.g., Enlow & Brown, 1956;Mattox, 1935;Suzuki, 1963). Although, the majority of studies on turtles osteohistology (mostly in extinct forms) have mainly focused on their shells (e.g., de la Fuente et al., 2017;Jannello et al., 2016;Maniel et al., 2018;Scheyer et al., 2014;Scheyer & Cerda, 2021;Scheyer & S anchez-Villagra, 2007;Sena et al., 2021;Sterli et al., 2020), albeit in recent years the histology of long bones has regained scientific relevance (e.g., Bhat et al., 2019;Botha & Botha, 2019;Cadena et al., 2020;Chinsamy & Valenzuela, 2008;Montes et al., 2010;Scheyer & Cerda, 2021;Sena et al., 2021). In spite of this, detailed intraskeletal bone histology studies in turtles remain scarce (Bhat et al., 2019;Botha & Botha, 2019;Pereyra et al., 2019Pereyra et al., , 2020 and most of these works tend to analyze stylopodium (i.e., humerus and femur), often relegating the osteohistology of other bones such as vertebrae and girdle (Bhat et al., 2019;Coles et al., 2001;Ehret, 2007;Chinsamy & Valenzuela, 2008;Curtin et al., 2008;Rhodin, 1985;Talevi, 2011;Zug et al., 2006). ...
... The teeth of xenarthrans are formed mostly of dentine, regarded as more prone to diagenetic modification compared to enamel because of its higher organic content, lower hardness, and smaller crystallites , thus making enamel the preferred material for isotope analysis. Nevertheless, isotopic studies on teeth of extinct sloths have been performed, showing that such analysis is feasible on dentin as well (Kohn et al., 2005;Ruez, 2005;Domingo et al., 2012;França et al., 2014;Silva, 2015;Dantas et al., 2017;Larmon et al., 2019;Pansani et al., 2019;Oliveira et al., 2020;Tomassini et al., 2020). The teeth of megatheriid sloths are prismatic, hypsodont, with subrectangular to subtriangular transverse outline and bilobate occlusal surfaces formed by transversal sharp crests separated by a deep valley (Owen, 1861;Spillmann, 1948;Sicher, 1953;Cartelle & De Iuliis, 1995;Vizcaíno, 2009). ...
... The patterns form from superficial resorption and deposition of bone that appears to be related to the positioning of Sharpey's fibers into bony ridges (de Buffrénil et al., 2016). Competing functional explanations for this sculpturing include improved skin attachment, thermal regulation, cutaneous respiration, reduction of water loss, and calcium stores that can be easily accessed by blood vessels (Clarac et al., 2015(Clarac et al., , 2019(Clarac et al., , 2020Janis et al., 2012;Plummer & O'Neal, 2019;Romer, 1947;Witzmann et al., 2010). There is likely an element of multifunctionality to the sculpturing and associated vascularization, especially across major groups of tetrapods (Witzmann et al., 2010). ...
... The presence of Sharpey´s fibers in the peripheral plate and none in the costal plate, and the presence of external cortical matrix in the internal cortex region of the peripheral plate likely correspond to variation between plates, as it does the difference in size of the vascular spaces in the cancellous bone. Similar differences were already reported in tortoises (Cerda et al., 2016;Jannello et al., 2020). Specimens IANIGLA-PV 179 and IANIGLA-PV 182 represent different ontogenetic stages, since their linear dimensions are also different. ...
... Paleohistological studies of sauropodomorph dinosaurs have mostly provided insights about traits related with: growth rate and growth dynamics, age for sexual and somatic maturity attainment, osseous pathologies, bone histogenesis and soft tissue reconstruction, among others (e.g. Currey 1962;Chinsamy 1993;Curry 1999;Sander and Klein 2005;Klein et al. 2012a, b;Griebeler et al. 2013;Hofmann et al. 2014;Curry Rogers and Kulik 2018;González et al. 2020). Most of these contributions have been conducted on taxa from Europe, North America and Africa, being the South American forms relatively less studied. ...
... The overall process of CCCB formation transforms cancellous bone into compact bone and typically occurs during cortical drift. CCCB is a peculiar tissue and has been described in a variety of taxa including armadillos (Heck et al., 2019), aardvarks (Legendre & Botha-Brink, 2018), wombats (Walker et al., 2020), rodents (Garrone et al., 2021;Montoya-Sanhueza & Chinsamy, 2017) and some non-avian dinosaurs (e.g. Avrahami et al., 2019;Woodward et al., 2018), although some authors note that CCCB is difficult to identify and may be more widespread throughout vertebrate cortical tissue than originally thought (Heck et al., 2019). ...