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      A New Non-Pterodactyloid Pterosaur from the Late Jurassic of Southern Germany

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          Abstract

          Background

          The ‘Solnhofen Limestone’ beds of the Southern Franconian Alb, Bavaria, southern Germany, have for centuries yielded important pterosaur specimens, most notably of the genera Pterodactylus and Rhamphorhynchus. Here we describe a new genus of non-pterodactyloid pterosaur based on an extremely well preserved fossil of a young juvenile: Bellubrunnus rothgaengeri (gen. et sp. nov.).

          Methodology/Principal Findings

          The specimen was examined firsthand by all authors. Additional investigation and photography under UV light to reveal details of the bones not easily seen under normal lighting regimes was completed.

          Conclusions/Significance

          This taxon heralds from a newly explored locality that is older than the classic Solnhofen beds. While similar to Rhamphorhynchus, the new taxon differs in the number of teeth, shape of the humerus and femur, and limb proportions. Unlike other derived non-pterodacytyloids, Bellubrunnus lacks elongate chevrons and zygapophyses in the tail, and unlike all other known pterosaurs, the wingtips are curved anteriorly, potentially giving it a unique flight profile.

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          Most cited references44

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          Pterosaur phylogeny and comments on the evolutionary history of the group

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            Respiratory Evolution Facilitated the Origin of Pterosaur Flight and Aerial Gigantism

            Pterosaurs, enigmatic extinct Mesozoic reptiles, were the first vertebrates to achieve true flapping flight. Various lines of evidence provide strong support for highly efficient wing design, control, and flight capabilities. However, little is known of the pulmonary system that powered flight in pterosaurs. We investigated the structure and function of the pterosaurian breathing apparatus through a broad scale comparative study of respiratory structure and function in living and extinct archosaurs, using computer-assisted tomographic (CT) scanning of pterosaur and bird skeletal remains, cineradiographic (X-ray film) studies of the skeletal breathing pump in extant birds and alligators, and study of skeletal structure in historic fossil specimens. In this report we present various lines of skeletal evidence that indicate that pterosaurs had a highly effective flow-through respiratory system, capable of sustaining powered flight, predating the appearance of an analogous breathing system in birds by approximately seventy million years. Convergent evolution of gigantism in several Cretaceous pterosaur lineages was made possible through body density reduction by expansion of the pulmonary air sac system throughout the trunk and the distal limb girdle skeleton, highlighting the importance of respiratory adaptations in pterosaur evolution, and the dramatic effect of the release of physical constraints on morphological diversification and evolutionary radiation.
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              A statistical study of Rhamphorhynchus from the Solnhofen Limestone of Germany: Year-classes of a single large species

              S. Bennett (1995)
              A statistical and morphological study of the pterosaur Rhamphorhynchus from the Solnhofen Limestone of Germany shows that specimens fall into discrete size-classes that are year-classes resulting from seasonal mortality or preservation of specimens. Taxonomic characters used in the past to separate species of Rhamphorhynchus are all related to size and ontogeny, and all specimens belong to a single species, R. muensteri. Thus, the collections of Rhamphorhynchus provide an unequaled record of the growth and development of a Jurassic rhamphorhynchoid pterosaur. Rhamphorhynchus did not have rapid determinate growth; the growth rate was comparable to that of extant crocodilians, and growth continued over the course of at least three years after individuals began to fly.
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                Author and article information

                Contributors
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, USA )
                1932-6203
                2012
                5 July 2012
                : 7
                : 7
                : e39312
                Affiliations
                [1 ]Department of Biology and Environmental Sciences, University College Dublin, Dublin, Ireland
                [2 ]Tannenweg 16, Stammham, Germany
                [3 ]Staatliches Museum für Naturkunde Karlsruhe, Karlsruhe, Germany
                [4 ]Museum Solnhofen, Bahnhofstraße 8, Solnhofen, Germany
                College of the Holy Cross, United States of America
                Author notes

                Conceived and designed the experiments: DWEH HT EF MR. Performed the experiments: HT. Analyzed the data: DWEH HT EF. Contributed reagents/materials/analysis tools: HT MR. Wrote the paper: DWEH HT EF MR.

                [¤]

                Current address: Department of Earth Sciences, University of Bristol, Bristol, United Kingdom

                Article
                PONE-D-11-23144
                10.1371/journal.pone.0039312
                3390345
                22792168
                57001dcd-03e8-4a8b-9c8d-dcd37d8838db
                Hone 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
                : 16 November 2011
                : 17 May 2012
                Page count
                Pages: 18
                Categories
                Research Article
                Biology
                Evolutionary Biology
                Paleontology
                Vertebrate Paleontology
                Paleontology
                Paleobiology
                Vertebrate Paleontology
                Zoology
                Animal Taxonomy
                Comparative Anatomy
                Herpetology
                Earth Sciences
                Paleontology
                Paleobiology
                Vertebrate Paleontology

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                Uncategorized

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