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  • 1
    Monograph available for loan
    Monograph available for loan
    Anatomy, Phylogeny and Palaeobiology of Early Archosaurs and their Kin (2013)
    London : The Geological Society
    Associated volumes
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    Call number: 9/M 07.0421(379)
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: vi, 608 S. : z. T. farb. Ill., graph. Darst.
    ISBN: 9781862393615
    Series Statement: Geological Society special publication 379
    URL: http://sp.lyellcollection.org/content/379/1
    Classification:
    Paleontology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Anatomy, Phylogeny and Palaeobiology of Early Archosaurs and their Kin (2013)
    London : The Geological Society
    Details
    Keywords: Triassic; palaeobiology; archosaurs
    Description / Table of Contents: Anatomy, phylogeny and palaeobiology of early archosaurs and their kin / Sterling J. Nesbitt, Julia B. Desojo and Randall B. Irmis / Geological Society, London, Special Publications, 379, 1-7, 11 June 2013, https://doi.org/10.1144/SP379.21 --- ‘Proterosuchia’: the origin and early history of Archosauriformes / Martín D. Ezcurra, Richard J. Butler and David J. Gower / Geological Society, London, Special Publications, 379, 9-33, 23 April 2013, https://doi.org/10.1144/SP379.11 --- Euparkeriidae / Roland B. Sookias and Richard J. Butler / Geological Society, London, Special Publications, 379, 35-48, 24 January 2013, https://doi.org/10.1144/SP379.6 --- Doswelliidae: a clade of unusual armoured archosauriforms from the Middle and Late Triassic / Hans-Dieter Sues, Julia B. Desojo and Martín D. Ezcurra / Geological Society, London, Special Publications, 379, 49-58, 23 April 2013, https://doi.org/10.1144/SP379.13 --- Proterochampsia: an endemic archosauriform clade from South America / María Jimena Trotteyn, Andrea B. Arcucci and Tiago Raugust / Geological Society, London, Special Publications, 379, 59-90, 11 June 2013, https://doi.org/10.1144/SP379.23 --- Phytosauria / Michelle R. Stocker and Richard J. Butler / Geological Society, London, Special Publications, 379, 91-117, 24 January 2013, https://doi.org/10.1144/SP379.5 --- Triassic pterosaurs / Fabio M. Dalla Vecchia / Geological Society, London, Special Publications, 379, 119-155, 25 April 2013, https://doi.org/10.1144/SP379.14 --- Non-dinosaurian Dinosauromorpha / Max C. Langer, Sterling J. Nesbitt, Jonathas S. Bittencourt and Randall B. Irmis / Geological Society, London, Special Publications, 379, 157-186, 13 February 2013, https://doi.org/10.1144/SP379.9 --- Ornithosuchidae: a group of Triassic archosaurs with a unique ankle joint / M. Belén von Baczko and Martín D. Ezcurra / Geological Society, London, Special Publications, 379, 187-202, 24 January 2013, https://doi.org/10.1144/SP379.4 --- Aetosauria: a clade of armoured pseudosuchians from the Upper Triassic continental beds / Julia B. Desojo, Andrew B. Heckert, Jeffrey W. Martz, William G. Parker, Rainer R. Schoch, Bryan J. Small and Tomasz Sulej / Geological Society, London, Special Publications, 379, 203-239, 13 June 2013, https://doi.org/10.1144/SP379.17 --- Rauisuchia / Sterling J. Nesbitt, Stephen L. Brusatte, Julia B. Desojo, Alexandre Liparini, Marco A. G. De França, Jonathan C. Weinbaum and David J. Gower / Geological Society, London, Special Publications, 379, 241-274, 24 January 2013, https://doi.org/10.1144/SP379.1 --- Early Crocodylomorpha / Randall B. Irmis, Sterling J. Nesbitt and Hans-Dieter Sues / Geological Society, London, Special Publications, 379, 275-302, 11 June 2013, https://doi.org/10.1144/SP379.24 --- The first occurrence of Chanaresuchus bonapartei (Archosauriformes, Proterochampsia) of the Middle Triassic of Brazil from the Santacruzodon Assemblage Zone, Santa Maria Formation (Paraná Basin) / Tiago Raugust, Marcel Lacerda and Cesar Leandro Schultz / Geological Society, London, Special Publications, 379, 303-318, 13 June 2013, https://doi.org/10.1144/SP379.22 --- Prorotodactylus and Rotodactylus tracks: an ichnological record of dinosauromorphs from the Early–Middle Triassic of Poland / Grzegorz Niedźwiedzki, Stephen L. Brusatte and Richard J. Butler / Geological Society, London, Special Publications, 379, 319-351, 23 April 2013, https://doi.org/10.1144/SP379.12 --- The Late Triassic dinosauromorph Sacisaurus agudoensis (Caturrita Formation; Rio Grande do Sul, Brazil): anatomy and affinities / Max C. Langer and Jorge Ferigolo / Geological Society, London, Special Publications, 379, 353-392, 23 April 2013, https://doi.org/10.1144/SP379.16 --- A new aetosaur from the Upper Triassic Chinle Formation of the Eagle Basin, Colorado, USA / Bryan J. Small and Jeffrey W. Martz / Geological Society, London, Special Publications, 379, 393-412, 11 June 2013, https://doi.org/10.1144/SP379.18 --- Growth curve of Aetosauroides scagliai Casamiquela 1960 (Pseudosuchia: Aetosauria) inferred from osteoderm histology / Jeremías R. A. Taborda, Ignacio A. Cerda and Julia B. Desojo / Geological Society, London, Special Publications, 379, 413-423, 11 June 2013, https://doi.org/10.1144/SP379.19 --- The braincase of Prestosuchus chiniquensis (Archosauria: Suchia) / Bianca Martins Mastrantonio, Cesar L. Schultz, Julia B. Desojo and Juliana Bittencourt Garcia / Geological Society, London, Special Publications, 379, 425-440, 23 April 2013, https://doi.org/10.1144/SP379.10 --- A reconstruction of the thigh musculature of the extinct pseudosuchian Prestosuchus chiniquensis from the Dinodontosaurus Assemblage Zone (Middle Triassic Epoch), Santa Maria 1 Sequence, southern Brazil / Alexandre Liparini and Cesar L. Schultz / Geological Society, London, Special Publications, 379, 441-468, 13 June 2013, https://doi.org/10.1144/SP379.20 --- The skull anatomy of Decuriasuchus quartacolonia (Pseudosuchia: Suchia: Loricata) from the middle Triassic of Brazil / Marco A. G. De França, Max C. Langer and Jorge Ferigolo / Geological Society, London, Special Publications, 379, 469-501, 13 February 2013, https://doi.org/10.1144/SP379.8 --- Cranial remains of Poposaurus gracilis (Pseudosuchia: Poposauroidea) from the Upper Triassic, the distribution of the taxon, and its implications for poposauroid evolution / William G. Parker and Sterling J. Nesbitt / Geological Society, London, Special Publications, 379, 503-523, 29 January 2013, https://doi.org/10.1144/SP379.3 --- Postcranial skeleton of Postosuchus kirkpatricki (Archosauria: Paracrocodylomorpha), from the Upper Triassic of the United States / Jonathan C. Weinbaum / Geological Society, London, Special Publications, 379, 525-553, 13 February 2013, https://doi.org/10.1144/SP379.7 --- Morphology and diversity of the mandibular symphysis of archosauriforms / Casey M. Holliday and Sterling J. Nesbitt / Geological Society, London, Special Publications, 379, 555-571, 24 January 2013, https://doi.org/10.1144/SP379.2 --- Body size evolution during the Triassic archosauriform radiation / Alan H. Turner and Sterling J. Nesbitt / Geological Society, London, Special Publications, 379, 573-597, 23 April 2013, https://doi.org/10.1144/SP379.15
    Pages: Online-Ressource (VII, 608 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862396395
    URL: https://sp.lyellcollection.org/content/379/1
    Language: English
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  • 3
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    The Sail-Backed Reptile Ctenosauriscus from the Latest Early Triassic of Germany and the Timing and Biogeography of the Early Archosaur Radiation (2018)
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    Publication Date: 2021-04-25
    Description: Background Archosaurs (birds, crocodilians and their extinct relatives including dinosaurs) dominated Mesozoic continental ecosystems from the Late Triassic onwards, and still form a major component of modern ecosystems (〉10,000 species). The earliest diverse archosaur faunal assemblages are known from the Middle Triassic (c. 244 Ma), implying that the archosaur radiation began in the Early Triassic (252.3–247.2 Ma). Understanding of this radiation is currently limited by the poor early fossil record of the group in terms of skeletal remains. Methodology/Principal Findings We redescribe the anatomy and stratigraphic position of the type specimen of Ctenosauriscus koeneni (Huene), a sail-backed reptile from the Early Triassic (late Olenekian) Solling Formation of northern Germany that potentially represents the oldest known archosaur. We critically discuss previous biomechanical work on the ‘sail’ of Ctenosauriscus, which is formed by a series of elongated neural spines. In addition, we describe Ctenosauriscus-like postcranial material from the earliest Middle Triassic (early Anisian) Röt Formation of Waldhaus, southwestern Germany. Finally, we review the spatial and temporal distribution of the earliest archosaur fossils and their implications for understanding the dynamics of the archosaur radiation. Conclusions/Significance Comprehensive numerical phylogenetic analyses demonstrate that both Ctenosauriscus and the Waldhaus taxon are members of a monophyletic grouping of poposauroid archosaurs, Ctenosauriscidae, characterised by greatly elongated neural spines in the posterior cervical to anterior caudal vertebrae. The earliest archosaurs, including Ctenosauriscus, appear in the body fossil record just prior to the Olenekian/Anisian boundary (c. 248 Ma), less than 5 million years after the Permian–Triassic mass extinction. These earliest archosaur assemblages are dominated by ctenosauriscids, which were broadly distributed across northern Pangea and which appear to have been the first global radiation of archosaurs.
    Keywords: Pangea; ctenosauriscids; archosaurs ; 551
    Language: English
    Type: article , publishedVersion
    Format: 28
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  • 4
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    Early Crocodylomorpha (2013)
    In:  Geological Society Special Publication 379: 275-302.
    Details
    Publication Date: 2013-08-06
    Description: Non-crocodyliform crocodylomorphs, often called ‘sphenosuchians’, were the earliest-diverging lineages of Crocodylomorpha, and document the stepwise acquisition of many of the features that characterize extant crocodylians. The first crocodylomorph fossils are approximately 230 million years old (upper Carnian, Late Triassic), and at least one of these early lineages persisted until at least 150 million years ago (Late Jurassic). These taxa occupied a wide variety of terrestrial environments from equatorial regions to high-paleolatitudes during the early Mesozoic. Despite a quarter-century of quantitative phylogenetic work, the interrelationships of early crocodylomorphs remain in a state of flux, though recent studies suggest that these lineages are paraphyletic with respect to Crocodyliformes, rather than forming a monophyletic early offshoot of Crocodylomorpha as some previously hypothesized. Nearly all early crocodylomorphs were upright quadrupedal small-bodied taxa, but lumping them all together as small cursorial faunivores masks ecological and morphological disparity in diet and limb functional morphology. With the accelerated pace of recent discovery of new specimens and taxa, future consensus on early crocodylomorph phylogeny will provide a solid framework for understanding their change in diversity and disparity through time, potential biogeographic patterns, and the morphological transformation leading to Crocodyliformes.
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  • 5
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    Non-dinosaurian Dinosauromorpha (2013)
    In:  Geological Society Special Publication 379: 157-186.
    Details
    Publication Date: 2013-08-06
    Description: Ichnological evidence suggests that dinosauromorphs originated by the Early Triassic, and skeletal remains of non-dinosaur representatives of the clade occur from the Anisian to the end of the Triassic. These taxa are small- to medium-sized, vary in feeding and locomotor features, and occurred over most of western Pangaea. They include the small lagerpetids from the Mid–Late Triassic of Argentina and the United States, and the larger, quadrupedal Silesauridae, with records in the Middle Triassic of Africa and Argentina, and in the Late Triassic of Europe, the Americas and northern Africa. The former group represents the earliest diverging dinosauromorphs, whereas silesaurids are more closely related to Dinosauria. Other dinosauromorphs include the archetypal early dinosauriform Marasuchus lilloensis (Middle Triassic of Argentina) and poorly known/controversial taxa such as Lewisuchus admixtus and Saltopus elginensis. The earliest diverging dinosauromorphs may have preyed on small animals (including insects), but cranio-dental remains are rare; by contrast, most silesaurids probably included plant material in their diet, as indicated by their modified jaw apparatus and teeth. Our knowledge of the anatomy and thus relationships of non-dinosaurian Dinosauromorpha is still deficient, and we suspect that future discoveries will continue to reveal novel patterns and hypotheses of palaeobiology and biogeography.
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  • 6
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    Anatomy, phylogeny and palaeobiology of early archosaurs and their kin (2013)
    In:  Geological Society Special Publication 379: 1-7.
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    Publication Date: 2013-08-06
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  • 7
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    Rauisuchia (2013)
    In:  Geological Society Special Publication 379: 241-274.
    Details
    Publication Date: 2013-08-06
    Description: ‘Rauisuchia’ comprises Triassic pseudosuchians that ranged greatly in body size, locomotor styles and feeding ecologies. Our concept of what constitutes a rauisuchian is changing as a result of discoveries over the last 15 years. New evidence has shown that rauisuchians are probably not a natural (monophyletic) group, but instead are a number of smaller clades (e.g. Rauisuchidae, Ctenosauriscidae, Shuvosauridae) that may not be each other's closest relatives within Pseudosuchia. Here, we acknowledge that there are still large gaps in the basic understanding in the alpha-level taxonomy and relationships of these groups, but good progress is being made. As a result of renewed interest in rauisuchians, an expanding number of recent studies have focused on the growth, locomotor habits, and biomechanics of these animals, and we review these studies here. We are clearly in the midst of a renaissance in our understanding of rauisuchian evolution and the continuation of detailed descriptions, the development of explicit phylogenetic hypotheses, and explicit palaeobiological studies are essential in advancing our knowledge of these extinct animals.
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  • 8
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    Cranial remains of Poposaurus gracilis (Pseudosuchia: Poposauroidea) from the Upper Triassic, the distribution of the taxon, and its implications for poposauroid evolution (2013)
    In:  Geological Society Special Publication 379: 503-523.
    Details
    Publication Date: 2013-08-06
    Description: The partial postcrania of Poposaurus gracilis, a bipedal poposauroid convergent with theropod dinosaurs, has been known for nearly a century, but the skull of P. gracilis has proven elusive. P. gracilis is part of a clade of morphologically divergent pseudosuchians (poposauroids) whose members are sometimes bipedal, lack dentition (i.e. beaks) and some have elongated neural spines (i.e. sails). However, the timing and acquisition of these character states is unknown given the uncertainty of the skull morphology of the ‘mid-grade’ poposauroid P. gracilis. Here, we present the first confirmed skull remains of P. gracilis directly associated with diagnostic pelvic elements that overlap with the holotype. The incomplete skeleton (PEFO 34865) from the Chinle Formation of Petrified Forest National Park (Arizona, USA) includes a left maxilla with a large, mediolaterally compressed tooth, left dentary, right prearticular and a partial postcranium. The character states of P. gracilis (bipedal, ‘sail-less’ and toothed) demonstrate that the evolution of bipedalism, the origin/loss of a dorsal ‘sail’ and the shift to an edentulous beak are complex in poposauroids. P. gracilis is widespread in the Upper Triassic formations in the western USA and is restricted temporally prior to the Adamanian–Revueltian faunal turnover during the Norian.
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  • 9
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    Body size evolution during the Triassic archosauriform radiation (2013)
    In:  Geological Society Special Publication 379: 573-597.
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    Publication Date: 2013-08-06
    Description: The first large (〉1 m) diapsids appeared near the Permian–Triassic extinction and a subset of diapsids, the archosauriforms, expanded their body size range soon after in the Early–Middle Triassic. Here, we examine body size at key evolutionary events within Archosauriformes during the Triassic and through the end-Triassic extinction. Using femoral length as a body size proxy and a temporally calibrated phylogeny of Archosauriformes, we estimate ancestral body sizes using a maximum likelihood approach and test for the presence of an adapative radiation by comparing the fit of competing evolutionary models. Archosauriform body size is characterized by punctuated change with more change occurring early in the Triassic. Archosaurs crossing the Triassic–Jurassic boundary show a wide range in ancestral size, and dinosaurs (sauropodomorphs and theropods) are considerably larger in the Jurassic. Crocodylomorph origins are characterized by a drop in body size; however, both the relative amount of change and the rate of change are matched among other archosaur clades. Archosauriforms increase in absolute body size through the Triassic and evidence suggests that a directional trend in size increase occurred in the early Mesozoic. The morphological signature of adaptive radiation is rare in comparative data from extant animals but is present at the origination of Archosauriformes.
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  • 10
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    Morphology and diversity of the mandibular symphysis of archosauriforms (2013)
    In:  Geological Society Special Publication 379: 555-571.
    Details
    Publication Date: 2013-08-06
    Description: Archosauromorphs radiated into numerous trophic niches during the Mesozoic, many of which were accommodated by particular suites of cranial adaptations and feeding behaviours. The mandibular symphysis, the joint linking the mandibles, is a poorly understood craniomandibular joint that may offer significant insight into skull function and feeding ecology. Using comparative data from extant amniotes, we investigated the skeletal anatomy and osteological correlates of relevant soft tissues in a survey of archosauromorph mandibular symphyses. Characters were identified and their evolution mapped using a current phylogeny of archosauriforms with the addition of non-archosauriform archosauromorphs. Extinct taxa with the simple Class I condition (e.g. proterochampsids, ‘rauisuchians’), rugose Class II (aetosaurs, protosuchians, silesaurids) and interdigitating Class III symphyses (e.g. phytosaurs, crocodyliforms) and finally fused Class IV (avians) build the joints in expected ways, although they differ in the contributions of bony elements and Meckel’s cartilage. Optimization of the different classes of symphyses across archosauromorph clades indicates that major iterative transitions from plesiomorphic Class I to derived, rigid Class II–IV symphyses occurred along the lines to phytosaurs, aetosaurs, a subset of poposauroids, crocodyliformes, pterosaurs and birds. These transitions in symphyseal morphology also appear to track changes in dentition and potentially diet.
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