Jordi Alexis GARCIA MARSÀ, Denis A. PONCE, Federico Lisandro AGNOLÍN, Fernando E. NOVAS
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引用次数: 0
Abstract
This present work reports new data on the palaeohistology of Chañares Formation (early Carnian) proterochampsids based on appendicular bones, particularly Chanaresuchus bonapartei Romer, 1971 (i.e., PULR-V 116, femur, tibia and fibula) and Tropidosuchus romeri Arcucci, 1990 (i.e., PVL-4606, femur), and provides new insights into their paleobiology, histovariability, as well as lifestyle. Chanaresuchus bonapartei presents intraspecific and interelemental histovaribility with collagen fibers organized from lamellar to woven fibered bone tissue, and degree of vascular density from sparse to dense. Both specimens appear to have attained sexual and skeletal maturity, but somatic maturity could not be inferred. Tropidosuchus romeri presents intraspecific histovaribility with collagen fibers organized from parallel-fibered to woven fibered bone tissue, and dense vascularization. The lifestyle analysis for T. romeri, using a statistical model that employs anatomical and microanatomical data, suggests a terrestrial habit. The Proterochampsidae Romer, 1966 recovered from the Chañares Formation exhibits a large disparity in growth strategies among individuals of the same taxa, and with respect to other contemporaneous Archosauriformes.
期刊介绍:
Comptes Rendus Palevol is a fully electronic and peer-reviewed journal, with a continuous publication stream, devoted to palaeontology, prehistory and evolutionary sciences. It publishes original research results, in French or English, in the following domains: systematic and human palaeontology, prehistory, evolutionary biology and macroevolution, and history of sciences. Thematic issues may also be published under the responsibility of a guest editor. All articles published in Comptes Rendus Palevol are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.