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      Novel insight into the origin of the growth dynamics of sauropod dinosaurs

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          Abstract

          Sauropod dinosaurs include the largest terrestrial animals and are considered to have uninterrupted rapid rates of growth, which differs from their more basal relatives, which have a slower cyclical growth. Here we examine the bone microstructure of several sauropodomorph dinosaurs, including basal taxa, as well as the more derived sauropods. Although our results agree that the plesiomorphic condition for Sauropodomorpha is cyclical growth dynamics, we found that the hypothesized dichotomy between the growth patterns of basal and more derived sauropodomorphs is not supported. Here, we show that sauropod-like growth dynamics of uninterrupted rapid growth also occurred in some basal sauropodomorphs, and that some basal sauropods retained the plesiomorphic cyclical growth patterns. Among the sauropodomorpha it appears that the basal taxa exploited different growth strategies, but the more derived Eusauropoda successfully utilized rapid, uninterrupted growth strategies.

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          Axial skeleton ontogeny in the Parasuchia (Archosauria: Pseudosuchia) and its implications for ontogenetic determination in archosaurs

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            Pelvic and hindlimb musculature of Tyrannosaurus rex (Dinosauria: Theropoda).

            In this article, we develop a new reconstruction of the pelvic and hindlimb muscles of the large theropod dinosaur Tyrannosaurus rex. Our new reconstruction relies primarily on direct examination of both extant and fossil turtles, lepidosaurs, and archosaurs. These observations are placed into a phylogenetic context and data from extant taxa are used to constrain inferences concerning the soft-tissue structures in T. rex. Using this extant phylogenetic bracket, we are able to offer well-supported inferences concerning most of the hindlimb musculature in this taxon. We also refrain from making any inferences for certain muscles where the resulting optimizations are ambiguous. This reconstruction differs from several previous attempts and we evaluate these discrepancies. In addition to providing a new and more detailed understanding of the hindlimb morphology of T. rex--the largest known terrestrial biped--this reconstruction also helps to clarify the sequence of character-state change along the line to extant birds. Copyright 2002 Wiley-Liss, Inc.
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              Bone histology indicates insular dwarfism in a new Late Jurassic sauropod dinosaur.

              Sauropod dinosaurs were the largest animals ever to inhabit the land, with truly gigantic forms in at least three lineages. Small species with an adult body mass less than five tonnes are very rare, and small sauropod bones generally represent juveniles. Here we describe a new diminutive species of basal macronarian sauropod, Europasaurus holgeri gen. et sp. nov., and on the basis of bone histology we show it to have been a dwarf species. The fossils, including excellent skull material, come from Kimmeridgian marine beds of northern Germany, and record more than 11 individuals of sauropods 1.7 to 6.2 m in total body length. Morphological overlap between partial skeletons and isolated bones links all material to the same new taxon. Cortical histology of femora and tibiae indicates that size differences within the specimens are due to different ontogenetic stages, from juveniles to fully grown individuals. The little dinosaurs must have lived on one of the large islands around the Lower Saxony basin. Comparison with the long-bone histology of large-bodied sauropods suggests that the island dwarf species evolved through a decrease in growth rate from its larger ancestor.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                27 June 2017
                2017
                : 12
                : 6
                : e0179707
                Affiliations
                [1 ]CONICET-Instituto de Investigaciónen Paleobiología y Geología, Universidad Nacional de Río Negro, Museo Carlos Ameghino, Cipolletti, Río Negro, Argentina
                [2 ]University of Cape Town, Department of Biological Sciences, South Africa
                [3 ]CONICET- Museo Paleontológico Egidio Feruglio, Trelew, Chubut, Argentina
                [4 ]IMCN-Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, San Juan, Argentina
                [5 ]CONICET-División Paleontología de Vertebrados, Museo de La Plata, La Plata, Argentina
                [6 ]CONICET-Facultad de Ciencias Naturales Universidad Nacional de Tucumán, Tucumán, Argentina
                College of the Holy Cross, UNITED STATES
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Article
                PONE-D-16-33420
                10.1371/journal.pone.0179707
                5487048
                28654696
                b8334d86-15dc-4e84-83b5-8adea7dddbb5
                © 2017 Cerda et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 21 August 2016
                : 2 June 2017
                Page count
                Figures: 14, Tables: 4, Pages: 38
                Funding
                Funded by: Ministerio de Ciencia, Tecnología e Innovación Productiva of the República Argentina
                Award ID: South Africa (SA/11/15)
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100006668, Fondo para la Investigación Científica y Tecnológica;
                Award ID: PICT-2011-1181
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100006668, Fondo para la Investigación Científica y Tecnológica;
                Award ID: PICT-2015-1021
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100006668, Fondo para la Investigación Científica y Tecnológica;
                Award ID: PICT 2014-1288
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100006668, Fondo para la Investigación Científica y Tecnológica;
                Award ID: PICT-2013-1920
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/501100006668, Fondo para la Investigación Científica y Tecnológica;
                Award ID: PICT-2011-2482
                Award Recipient :
                Funded by: African Origins platform, NRF, South Africa to AC
                Award ID: African Origins platform, NRF
                Award Recipient :
                Funded by: funder-id http://dx.doi.org/10.13039/100001257, National Geographic Society Education Foundation;
                Award ID: Research Grant 8860-10
                Award Recipient :
                This work was supported by National Geographic Society, Ministerio de Ciencia, Tecnología e Innovación Productiva of the República Argentina and the National Research Foundation (NRF), South Africa, Agencia Nacional de Promoción Científica y Técnica, African Origins platform.
                Categories
                Research Article
                Biology and Life Sciences
                Organisms
                Animals
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Saurischia
                Sauropoda
                Biology and Life Sciences
                Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Saurischia
                Sauropoda
                Earth Sciences
                Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Saurischia
                Sauropoda
                Biology and Life Sciences
                Paleontology
                Paleobiology
                Paleozoology
                Vertebrate Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Saurischia
                Sauropoda
                Earth Sciences
                Paleontology
                Paleobiology
                Paleozoology
                Vertebrate Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Saurischia
                Sauropoda
                Biology and Life Sciences
                Anatomy
                Histology
                Medicine and Health Sciences
                Anatomy
                Histology
                Biology and Life Sciences
                Organisms
                Animals
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Biology and Life Sciences
                Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Earth Sciences
                Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Biology and Life Sciences
                Paleontology
                Paleobiology
                Paleozoology
                Vertebrate Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Earth Sciences
                Paleontology
                Paleobiology
                Paleozoology
                Vertebrate Paleontology
                Prehistoric Animals
                Archosauria
                Dinosaurs
                Biology and Life Sciences
                Anatomy
                Musculoskeletal System
                Skeleton
                Femur
                Medicine and Health Sciences
                Anatomy
                Musculoskeletal System
                Skeleton
                Femur
                Biology and Life Sciences
                Cell Biology
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                Animal Cells
                Connective Tissue Cells
                Osteoblasts
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                Biology and Life Sciences
                Anatomy
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                Connective Tissue
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                Osteocytes
                Medicine and Health Sciences
                Anatomy
                Biological Tissue
                Connective Tissue
                Connective Tissue Cells
                Osteoblasts
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                Biology and Life Sciences
                Developmental Biology
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                Biology and Life Sciences
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                Medicine and Health Sciences
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                Bone Remodeling
                Biology and Life Sciences
                Physiology
                Physiological Processes
                Bone Remodeling
                Bone Resorption
                Medicine and Health Sciences
                Physiology
                Physiological Processes
                Bone Remodeling
                Bone Resorption
                Custom metadata
                Data on accession numbers, locality and horizon of these samples are compiled in Table 1.

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