PRODUCTION IN SCIENCE: DINOSAURS, EVOLUTION AND REGIONAL GEOLOGY
La producción científica en el campo de la Ciencias de la Tierra y la Paleontología de dinosaurios tiene aplicación directa sobre el conocimiento y el aprovechamiento cultural, turístico y económico de los recursos naturales y la geología regional. // Scientific production in the field of Earth Sciences and Dinosaur Paleontology has direct application to knowledge and the cultural, tourist and economic use of natural resources and regional geology.
Wednesday, January 17, 2024
Paleobiology allows us to understand the physiology and behavior of animals. This is key to analyze evolution, genetic and phylogenetic aspects, and adaptations to the environment. Here, through a microscopic study, key aspects can be known.
Paper
González, R., Cerda, I., Perez
Moreno, A., Calvo, J., Gonzalez Riga,
B. 2023. Paleobiology of Rinconsaurus caudamirus and
Muyelensaurus pecheni (Sauropoda, Titanosauria) from the Neuquen Group, Upper
Cretaceous of Argentina: inferences from long bone histology. Cretaceous
Research 153, 105682.
PDF:
abstract
Titanosauria is the most successful and diverse clade of sauropodomorph dinosaurs, with some of the largest and smallest sauropod species known to date. Rinconsaurus caudamirus and Muyelensaurus pecheni were two small-sized titanosaurs recollected from the Neuquen Group (Upper Cretaceous) of Argentina. The bone remains of both specimens include axial and appendicular elements corresponding to several individuals. These taxa have been anatomically and phylogenetically studied, but did not analyzed from paleohistological viewpoint yet. This contribution focuses on the description of the long bone histology of both species including several aspects of its paleobiology. For this, thin transverse sections were made at the diaphysis level and were analyzed under microscope. The histology of M. pecheni and R. caudamirus shows a uniform bone microstructure similar to other titanosaurs, with changes in bone tissue types being mostly related to the different life story. The major difference between the taxa is in the type of bone matrix. Whereas woven fibered bone predominates in the cortex of M. pecheni, R. caudamirus shows parallel-fibered bone. The presence of this last primary tissue is consistent with the reduced size of R. caudamirus. The long bone histology of M. pecheni resembles that of large basal neosauropods. Contrary to the reported for other noesauropods, the data obtained in this study does not reveal a correlation between the ontogenetic stage and the body size in R. caudamirus and M. pecheni. Finally, as was mentioned previously to others titanosaurs, both specimens show a high rate of secondary remodeling.
Fig. 7. Bone microstructure of the left femur of Rinconsaurus caudamirus MAU-Pv-RS-92. (A) Outer cortex showing parallel-fibered bone. Polarized light with lambda compensator. (B) Detail of a single annulus in the outer cortex. Normal transmitted light. (C) Abundant secondary osteons in the mid cortex. Polarized light with lambda compensator. (D) Remains of primary parallel-fibered bone between the secondary osteons. Polarized light with lambda compensator. (E) Inner cortex composed of dense Haversian bone tissue. Normal transmitted light. (F) Two generations of overlapping secondary osteons. Normal transmitted light. Abbreviations: an: annulus; cvc: circumferential vascular canal; pfm: parallel fibered matrix; po: primary osteon; rca: resorption cavity; so: secondary osteon. Scale bars: A, B; DeG ¼ 0.2 mm; C ¼ 0.3 mm.
DISCOVERIES / DESCUBRIMIENTOS
New species described by PhD. Bernardo Gonzalez Riga
Dinosaurios, tortugas y pterosaurios (16 especies)
·
Chucarosaurus diripienda Agnolin, Gonzalez Riga, Aranciaga, Rozadilla, Motta,
Chimento, Novas. 2023.
·
Arackar licanantay Rubilar-Rogers, Vargas, González Riga,
Soto-Acuña, Alarcón-Muñoz, Iriarte-Díaz, Arévalo, Gutstein, 2021
·
Tanatosdraskon amaru Ortiz David, González Riga, Kellner, 2022.
·
Sektensaurus sanjuanboscoi, Ibiricu, Casal, Luna, Canale, Alvarez, Gonzalez Riga, 2019.
·
Baalsaurus mansillai, Calvo y González Riga, 2019.
·
Mendozachelys wichmanni de la Fuente, M.,
Maniel, I., Jannello, J.M., Sterli, J., González Riga, B., Novas, F. 2016.
·
Notocolossus gonzalezparejasi González Riga,
Lamanna, Ortiz David, Calvo and Coria 2016.
·
Quetecsaurus rusconii González Riga and Ortiz David 2014.
·
Lapampasaurus cholinoi Coria, González Riga and Casadio 2012.
·
Malarguesaurus florenciae González Riga, Previtera and Pirrone 2009.
·
Futalongkosaurus
dukei Calvo, Porfiri, González Riga
and Kellner 2007.
·
Muyelensaurus
pecheni Calvo, González Riga and Porfiri 2007.
·
Ligabuesaurus
leanzai Bonaparte, González Riga and
Apesteguía 2006.
·
Linderochelys
riocolodoensis Calvo, Gonzalez Riga, Porfiri, 2003.
·
Rinconsaurus
caudamirus Calvo and González Riga 2003.
·
Mendozasaurus
neguyelap González Riga 2003.
Ichnospecies
§
Teratopodus malarguensis Tomaselli, Ortiz David, González
Riga, Coria, Mercado, Guerra, Sanchez
Tirivoli 2022
§ Titanopodus
mendozensis González Riga and Calvo 2009.
§ Cubiculum
levis Pirrone, Batois y González Riga
2014
Clados
§
Colossosauria González Riga, B.J, Lamanna, M.C., Otero, A., Ortiz David, L.D.,
Kellner, A.W.A., Ibiricu, L. M. 2019
§
Rinconsauria Calvo,
González Riga, Porfiri, 2007
§
Lonkosauria Calvo,
Gonzalez Riga, Kellner, Porfiri 2007
Sunday, August 13, 2023
Taphonomy, new perspectives: a chapter in a book of sauropods.
Taphonomy: Overview and New Perspectives Related to the Paleobiology of Giants
Bernardo J. González Riga, Gabriel A. Casal, Anthony R. Fiorillo, and Leonardo D. Ortiz David
Abstract Most taphonomy studies of South American sauropodomorphs have addressed extrinsic factors such as sedimentary environments, bone dispersal, and mineralogical processes that occurred during fossil diagenesis. These studies provide important data on the taphonomic modes which are associated with bone accumulations in different paleoenvironmental contexts. However, these analyses have generally not considered intrinsic factors like the shape, size, and structural integrity of the skeletal elements, variables that can produce some taphonomic bias. Sauropodomorphs include dinosaurs of highly varied sizes, ranging from small (less than 8 m long) to remarkably giant forms (around 30 m long). In the largest sauropods, such as the huge titanosaurs, very incomplete skeletons are commonly found and most notably skull and articulated pedes rarely are preserved. We focus here on some intrinsic anatomical factors as they relate to articulation in some key parts of the skeletons. Further, this study suggests that the preservation of fragile portions of sauropodomorph skeletons was possible only under specific combinations of sedimentological and biological processes.
Keyword Taphonomy · Sauropoda · Extrinsic factors · Taphonomic modes · South America
1 Introduction
Taphonomy is the study of all biotic and abiotic factors that influence the preservation of organismal remains after death (Behrensmeyer and Kidwell 1985; Behrensmeyer et al. 2000). Fiorillo and Eberth (2004) succinctly point out that ‘Taphonomic factors remove or modify information about living organisms and assemblages (e.g., soft tissue decomposition, bone dispersal) and therefore create a biased picture of their biology and environmental and ecological associations.’ Dinosaur taphonomy, then, is a multidisciplinary science with diverse aims and applications (Lyman 1994). In many regions of the world. taphonomy studies have had a relatively important multidisciplinary development. These studies typically include sedimentologists and paleontologists combining their expertise to understand the origin of fossil assemblages (Behrensmeyer and Kidwell 1985; Fastovsky et al. 1997; Eberth et al. 2001; Rogers et al. 2001; Fiorillo and Eberth 2004; Moore and Norman 2009; Csiki et al. 2010; Orr et al. 2016; Botfalvai et al. 2017). In South America, taphonomic studies have increased in recent years, incorporating new methods and techniques, but they fall short with respect to the growing and numerous discoveries of new species of sauropodomorphs. This is particularly unfortunate given that the last few decades have seen a tremendous growth in discoveries of new taxa of sauropods (Martínez et al. 2016; González Riga et al. 2016, 2019; Carballido et al. 2017). Further, given the enormous body size of many of these dinosaurs, in this chapter we explore how sauropods can provide unique insights into taphonomic processes that smaller-bodied vertebrates, including other dinosaurian clades, cannot offer. This is particularly evident in the examples of large, massive animals with skeletons 30 m long that cannot be covered by most fluvial sedimentary processes. This report will provide an overview that highlights the insights gained by studying such an unusual group of dinosaurs. In South America, most taphonomic studies of Triassic and Jurassic dinosaurs are focused on whole vertebrate assemblages, including some paleoecological aspects related to the increase of abundance, diversity, and body size of sauropodomorphs from the Late Triassic onwards (Martínez et al. 2011, 2013). Some taphonomic reviews focus on taphonomic modes (sensu Behrensmeyer 1988; Behrensmeyer and Hook 1992) and sedimentary environments (Colombi et al. 2012, 2017; Otero et al. 2019a). The Cretaceous fossil record from this continent includes 71 known and valid sauropod species, most of them titanosaurians. Recent studies on sauropod occurrences have included information about the preservational processes (i.e., biostratinomy, fossil diagenesis), and in some cases, the characterization of taphonomic modes, such as in the case of Mendozasaurus neguyelap (González Riga et al. 2007), Bonitasaura salgadoi (Pérez et al. 2009), Aeolosaurus colhuehuapensis (Casal et al. 2014a), and Pilmatueia faundezi (Pino et al. 2021). Additionally, important taphonomic studies of exceptionally preserved nest, eggs, and embryos have been made in Auca Mahuevo in northern Argentinean Patagonia (Chiappe et al. 1998, 2005; Salgado et al. 2005; García et al. 2010) as well as in Sanagasta in northwestern of Taphonomy: Overview and New Perspectives … 543 Argentina, shedding insights on both paleoenvironmental aspects and the gregarious behavior of sauropods (Fiorelli et al. 2012, 2013). The aim of this chapter is to bring forward primary taphonomic observations that focus specifically on South American Cretaceous sauropodomorphs, including the analysis of some intrinsic and extrinsic factors related to accumulation of large skeletal elements. Moreover, a new nomenclatural code is proposed in the analysis of taphonomic modes, to facilitate their description and understanding with respect to sauropods, and other relatively large no-avian dinosaurs. Lastly, it is important to point out that for the purposes of this study, as most of the case studies we cite are coincident with the now decades long growing appreciation of the value of taphonomic practices to an excavation, we make the assumption that all available bones were excavated, and removal of skeletal elements was not selective
Thursday, March 10, 2022
REFERENCES
Rubilar-Rogers, D.; Vargas, A. O.; González Riga, B.; Soto-Acuña, S.; Alarcón-Muñoz, J.; Iriarte-Díaz, J.; Arévalo, C.; Gutstein, C. S. (2021). Arackar licanantay gen. et sp. nov. a new lithostrotian (Dinosauria, Sauropoda) from the Upper Cretaceous of the Atacama Region, northern Chile. Cretaceous Research. doi:10.1016/j.cretres.2021.104802.
SCIENTIFIC OUTREACH
2021. DIARIO LA NACION. Presentan una nueva especie de dinosaurio chileno: el Arackar licanantay - La Nación (lanacion.cl)
2021. DIARIO CLARIN. Un argentino participó del descubrimiento de una nueva especie de dinosaurio en Chile (clarin.com)
2021. DIARIO PAGINA 12. Bernardo González Riga | HECHO EN CASA | Página12 (pagina12.com.ar)
2021. DIARIO LOS ANDES. Gran hallazgo: un mendocino de la UNCuyo descubrió uno de los últimos titanosaurios en Chile | Sociedad (losandes.com.ar)
2021. DIARIO MDZ. Descubren restos de un dinosaurio nunca visto y un argentino participa del estudio - MDZ Online (mdzol.com)
2021. DIARIO VIA PAIS. Histórico hallazgo: mendocino descubre un Titanosaurio en el desierto chileno de Atacama | Vía Mendoza (viapais.com.ar)
Sunday, May 5, 2019
Papers' González Riga
Papers' González Riga
Agnolin, F., Gonzalez Riga, B., Aranciaga, A., Rozadilla, S., Motta, M., Chimento, N., Novas, F. 2023. A new gigant titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Northwestern Patagonia, Argentina. Cretaceous Research Volume 146, 105487.
González Riga, B.J., Ortiz David, L.D., Tomaselli, M.B., Coria, J.P. 2022. Laboratorio y Museo de Dinosaurios de la Universidad Nacional de Cuyo: fundación, historia y descubrimientos científicos. En: Gasparini, Z.; Salgado, L.; Desojo, J. (Eds.). Paleoherpetología en la Argentina: 150 años de historia. Paleontología Electrónica 22(1): 132-147.
Ortiz David, L, Gonzalez Riga, B. J., kellner, A. 2022. Thanatosdrakon amaru, gen. et sp. nov., a giant azhdarchid pterosaur from the Upper Cretaceous of Argentina. Cretaceous Research: 137, 105228. https://doi.org/10.1016/j.cretres.2022.105228.
Rubilar-Rogers, D.; Vargas, A. O.; González Riga, B.; Soto-Acuña, S.; Alarcón-Muñoz, J.; Iriarte-Díaz, J.; Arévalo, C.; Gutstein, C. S. 2021. «Arackar licanantay gen. et sp. nov. a new lithostrotian (Dinosauria, Sauropoda) from the Upper Cretaceous of the Atacama Region, northern Chile». Cretaceous Research: 104802. doi:10.1016/j.cretres.2021.104802
Tomaselli, M.B.; Ortiz David, L.D.; González Riga, B.J. 2021a. Paleoenvironmental contexts of South American Cretaceous sauropod tracks. Journal of South American Earth Sciences 110: 103393. https://doi.org/10.1016/j.jsames.2021.103393
Tomaselli, M.B.; Ortiz David, L.D.; González Riga, B.J.; Coria, J.P.; Mercado, C.R.; Guerra, M.; Sánchez Tiviroli, G. 2021b. New titanosaurian sauropod tracks with exceptionally well-preserved claw impressions from the Upper Cretaceous of Argentina. Cretaceous Research 129: 104990. https://doi.org/10.1016/j.cretres.2021.104990
Editor of books
2011. Paleobiology of South
American titanosaurs. IN: J.Calvo,
J.Porfiri, B. Gonzalez Riga and D. Dos Santos (editors). Paleontología y
dinosaurios desde América Latina, EDIUNC, Universidad Nacional de Cuyo (ISCN
978-950-39-0265-3), PP. 260.
2016-actualidad.
Es Editor Asociado de la Revista Anais
Da Academia brasileira de Ciencias, Brasil.
2021.
Editor Responsable del libro Los Vertebrados Fósiles, publicado
por la Fundación Félix de Azara, Buenos Aires. Comprende 45 capitulos
distribuidos en 3 volumenes, a cargo de 62 autores convocados por el Dr.
Gonzalez Riga. (obra en desarrollo).
Chapters of books
González Riga, B.J., Casal, G., Fiorillo, A., Ortiz David,
L.D., 2022. Taphonomy:
overview and new perspectives related to the paleobiology of giants (Chapter
15). In: South American Sauropodomorph dinosaurs: record, diversity and
evolution. Otero, A., Carballido, J.L., Pol, D. (Eds.). Springer Earth System Sciences, pp. 299-391.
Gallina, P.A., González Riga, B.J.,
Ortiz David, L.D., 2022. A second time for giants: titanosaurs from the
Aptian-Santonian age (Chapter 9). In: South American Sauropodomorph dinosaurs:
record, diversity and evolution. Otero, A., Carballido, J.L., Pol, D. (Eds.). Springer Earth System Sciences, pp.
299-391.
Calvo, J.O.; González Riga, B.J.;
Apesteguía, S.; Tomaselli, M.B. 2022. Sauropod Ichnology: Overview and new
research lines from a South American perspective (Chapter 14). In: Otero, A.;
Carballido, J.L.; Pol, D. (Eds.). South American Sauropodomorph dinosaurs:
record, diversity and evolution. Springer Earth System Sciences, pp. 503–540.
González Riga, B. J. 2020. Enseñar ciencia haciendo ciencia. En
R. Piezzi y M. Tovar (Compiladores), Historia de un proyecto transgerenacional:
las ciencias básicas en la Universidad Nacional de Cuyo, Editorial de la
Universidad Nacional de Cuyo, pp. 81–93.
Calvo, O.,
Porfiri, J., Pol, D., González Riga, B.J.,
de la Fuente, M., Rougier, G.W. 2011. Vertebrados continentales mesozoicos. IN:
Relatorio de la Provincia del Neuquén. XVIII Congreso Geológico Argentino:
539-556.
González Riga, B.J. 2010. Paleobiology of South American
titanosaurs. IN: J. Calvo, J.Porfiri, B. Gonzalez Riga and D. Dos Santos (eds),
Paleontología y dinosaurios desde America
Latina, Editorial de la Universidad Nacional de Cuyo (ISCN
978-950-39-0265-3), pp. 125-141.
González Riga, B.J.,
Calvo, J.O., Previtera, E. 2009. E. Taphonomic analyses of titanosaur sauropods from the Neuquén Basin
(Argentina) and their implications in systematic studies. IN:
Colectivo Arqueológico y Paleontológico de Salas, C.A.S. (eds.), IV Jornadas
Internacionales sobre Paleontología de Dinosaurios y su entorno: 235-241.
González Riga, B.J. 2002. Dinosaurs and environments from the Cretaceous of the Province
of Mendoza, Argentina. IN: D. Trombotto y
R. Villalba (editors), IANIGLA, 30 años de investigación básica y
aplicada en ciencias ambientales, ISBN: 987-43-4545-4, Instituto
Argentino de Nivología, Glaciología y Ciencias Ambientales, CONICET, pp.
197-202.
LABORATORIO Y MUSEO DE DINOSAURIOS DE LA UNIVERSIDAD NACIONAL DE CUYO: FUNDACIÓN, HISTORIA Y DESCUBRIMIENTOS CIENTÍFICOS BERNARDO J. GONZÁ...
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LABORATORIO Y MUSEO DE DINOSAURIOS DE LA UNIVERSIDAD NACIONAL DE CUYO: FUNDACIÓN, HISTORIA Y DESCUBRIMIENTOS CIENTÍFICOS BERNARDO J. GONZÁ...
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Paleobiology allows us to understand the physiology and behavior of animals. This is key to analyze evolution, genetic and phylogenetic aspe...
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Discoveries of dinosaur fossil footprints and their cultural, educational and tourist application for Argentina Titanosaur sauropods ...