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Taxonomy of the archosaur Ornithosuchus: reassessing Ornithosuchus woodwardi Newton, 1894 and Dasygnathoides longidens (Huxley 1877)

Published online by Cambridge University Press:  17 October 2016

M. Belén von Baczko  and
Martín D. Ezcurra
M. Belén von Baczko
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; and Sección Paleontología Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina Email: [email protected]
Martín D. Ezcurra
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; and Sección Paleontología Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina Email: [email protected]
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Abstract

The pseudosuchian archosaur Ornithosuchus, from the Lossiemouth Sandstone Formation (Late Triassic), Scotland, was the first ornithosuchid to be discovered, and the only one recorded, in the northern hemisphere. The fossil record of “Ornithosuchus longidens” is mainly based on natural moulds and, in a few cases, three-dimensional bony elements, complicating the interpretation of its anatomy. The taxonomy of this species has changed several times since the late 1800s and here we revisit its current status. The synonymy of “Dasygnathoides longidens” and Ornithosuchus woodwardi proposed by Walker (1964) is rejected, based on new interpretations of the holotype and referred specimens of “Dasygnathoides longidens”. The latter species is considered as a nomen dubium, because it lacks diagnostic features and cannot be identified beyond Pseudosuchia. As a result, Ornithosuchus woodwardi is resurrected as a valid species and its diagnosis is emended. The body size range of Ornithosuchus woodwardi is reduced to about a half, because ELGNM 1, previously considered the largest specimen of the genus, can no longer be referred to it. “Dasygnathoides longidens” cannot be assigned to any of the known archosauriforms from the Lossiemouth Sandstone Formation, but it still represents the largest predator currently known for its fauna.

Keywords

“Dasygnathus”Late TriassicLossiemouth Sandstone FormationOrnithosuchus longidensOrnithosuchidaePseudosuchiaScotland
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 106 , Issue 3 , September 2015 , pp. 199 - 205
Copyright
Copyright © The Royal Society of Edinburgh 2016 

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References

8. References

Baczko, M. B. von, Desojo, J. B. & Pol, D. 2014. Anatomy and phylogenetic position of Venaticosuchus rusconii Bonaparte, 1970 (Archosauria, Pseudosuchia), from the Ischigualasto Formation (Late Triassic), La Rioja, Argentina. Journal of Vertebrate Paleontology 34(6), 1342–56.Google Scholar
Baczko, M. B. von & Desojo, J. B. 2016. Cranial anatomy and palaeoneurology of the archosaur Riojasuchus tenuisceps from the Los Colorados Formation, La Rioja, Argentina. PLoSOne 11(2), e0148575.Google Scholar
Baczko, M. B. von & Ezcurra, M. D. 2013. Ornithosuchidae: a group of Triassic archosaurs with a unique ankle joint. Geological Society, London, Special Publications 379(1), 187–202.Google Scholar
Benton, M. J. 1999. Scleromochlus taylori and the origin of dinosaurs and pterosaurs. Philosophical Transactions of the Royal Society of London B, Biological Sciences 354(1388), 1423–46.Google Scholar
Benton, M. J. & Walker, A. D. 2011. Saltopus, a dinosauriform from the Upper Triassic of Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 101(for 2010), 285–99.Google Scholar
Bisby, F. A., Roskov, Y. R., Orrell, T. M., Nicolson, D., Paglinawan, L. E., Bailly, N., Kirk, P. M., Bourgoin, T., Baillargeon, G. & Ouvrard, D. 2011. Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist. http://www.catalogueoflife.org/annual-checklist/2011/search/all/key/isoscelipteron/match/1Google Scholar
Bonaparte, J. F. 1969. Dos nuevas “faunas” de reptiles triásicos de Argentina. In Gondwana Stratigraphy, IUGS Symposium, Buenos Aires, 1967, 283–306. Paris, France: United Nations Educational, Scientific and Cultural Organization. 1174 pp.Google Scholar
Bonaparte, J. F. 1970. Annotated list of the South American Triassic tetrapods. Proceedings of the Second Gondwana Symposium (South Africa, July to August 1970), 665–82. Pretoria: Council for Scientific and Industrial Research. v + 689 pp.Google Scholar
Boulenger, G. A. 1903. On reptilian remains from the Trias of Elgin. Philosophical Transactions of the Royal Society of London B, Biological Sciences 196, 175–89.Google Scholar
Broom, R. 1913. On the South African pseudosuchian Euparkeria and allied genera. Proceedings of the Zoological Society of London 83(3), 619–33.Google Scholar
Brusatte, S. L., Benton, M. J., Desojo, J. B. & Langer, M. C. 2010. The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida). Journal of Systematic Palaeontology, 8(1), 3–47.Google Scholar
Butler, R. J., Sullivan, C., Ezcurra, M. D., Liu, J., Lecuona, A. & Sookias, R. B. 2014. New clade of enigmatic early archosaurs yields insights into early pseudosuchian phylogeny and the biogeography of the archosaur radiation. BMC Evolutionary Biology 14(1), 128.Google Scholar
Cope, E. D. 1871. Synopsis of the extinct Batrachia, Reptilia and Aves of North America. Philadelphia: McCalla & Stavely, printers.Google Scholar
Ezcurra, M. D. 2016. The phylogenetic relationships of basal archosauromorphs, with an emphasis on the systematics of proterosuchian archosauriforms. PeerJ 4, e1778.Google Scholar
Gauthier, J. & Padian, K. 1985. Phylogenetic, functional, and aerodynamic analyses of the origin of birds and their flight. In Hecht, M. K., Ostrom, J. H., Viohl, G. & Wellnhofer, P. (eds) The Beginning of Birds (Proceedings of the International Archaeopteryx Conference, Eichstatt, 1984), 185–97. Eichstatt: Freunde des Jura-Museums. 382 pp.Google Scholar
Huene, F. von. 1908. Die Dinosaurier der europäischen Triasformation mit Berücksichtigung der aussereuropäischen Vorkommnisse. Geologische und Paläontologische Abhandlungen 1(Suppl.), 1–419.Google Scholar
Huxley, T. H. 1859. On the Stagonolepis robertsoni (Agassiz) of the Elgin Sandstones; and on the recently discovered Footmarks of Cummingstones. Proceedings of the Geological Society 15, 440–61.Google Scholar
Huxley, T. H. 1869. On Stagonolepis robertsoni, and on the evolution of Crocodilia. Quarterly Journal of the Geological Society 31, 423–38.Google Scholar
Huxley, T. H. 1877. The Crocodilian Remains Found in the Elgin Sandstones: With Remarks on the Ichnites of Cummingstone. Memoirs of the Geological Survey of the United Kingdom, Monograph III. UK: HM Stationary Office.Google Scholar
Kuhn, O. 1961. Die Familien der rezenten und fossilen Amphibien und Reptilien. Bamberg: Meisenbach.Google Scholar
Liu, J., Butler, R. J., Sullivan, C. & Ezcurra, M. D. 2015. ‘Chasmatosaurus ultimus,' a putative proterosuchid archosauriform from the Middle Triassic, is an indeterminate crown archosaur. Journal of Vertebrate Paleontology 35(5), e965779.Google Scholar
Macleay, W. S. 1819. Horae Entomologicae: Or, Essays on the Annulose Animals. Vol. 1. London, UK: S. Bagster.Google Scholar
Nesbitt, S. J. 2011. The early evolution of archosaurs: relationships and the origin of major clades. Bulletin of the American Museum of Natural History 352, 1–292.Google Scholar
Newton, E. T. 1894. Reptiles from the Elgin Sandstone – Description of two new genera. Philosophical Transactions of the Royal Society of London B, Biological Sciences 185, 573–607.Google Scholar
Sereno, P. C. 1991. Basal archosaurs: Phylogenetic relationships and functional implications. Journal of Vertebrate Paleontology 11(S4), 1–53.Google Scholar
Walker, A. D. 1961. Triassic reptiles from the Elgin area: Stagonolepis, Dasygnathus and their allies. Philosophical Transactions of the Royal Society of London B, Biological Sciences 244(709), 103–204.Google Scholar
Walker, A. D. 1964. Triassic reptiles from the Elgin area Ornithosuchus and the origin of Carnosaurs. Philosophical Transactions of the Royal Society of London B, Biological Sciences 744, 53–134.Google Scholar
Zittel, K. A. von. 1887–1890. Handbuch der Paläontologie. Abteilung 1: Paläozoologie Band III. Vertebrata (Pisces, Amphibia, Reptilia, Aves). Munich and Liepzig: Oldenbourg. 1890 pp.Google Scholar