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Palaeobiodiversity and Palaeoenvironments

, Volume 98, Issue 2, pp 243–258 | Cite as

Land or water: using taphonomic models to determine the lifestyle of the Triassic protorosaur Tanystropheus (Diapsida, Archosauromorpha)

  • Susan R. Beardmore
  • Heinz Furrer
Original Paper

Abstract

The Middle Triassic protorosaur Tanystropheus has been considered as both a terrestrial and aquatic taxon based on several lines of biomechanical and distributional evidence, but determining conclusively which habitat was most likely has remained problematic. Specimens of Tanystropheus longobardicus from the Middle Triassic Besano Formation, Monte San Giorgio, are used to investigate the possibility that palaeoecology can be inferred from skeletal taphonomy, which is compared to that of the pachypleurosaurid Serpianosaurus mirigiolensis (considered to be entirely aquatic) and the protorosaur Macrocnemus bassanii (terrestrial) from the same formation. The preservation of Tanystropheus was found to be more similar to Macrocnemus than Serpianosaurus implying carcasses of Tanystropheus originated in terrestrial or at least marginal and near-shore, shallow marine settings. That these were also the most probable habitats in life is supported by the relatively lower number of Tanystropheus (and also Macrocnemus) compared to Serpianosaurus. The study has further implications for the integument of the taxon, which remained sufficiently coherent to prevent the loss of disarticulated elements during an interval of floating necessary to reach the Monte San Giorgio Basin where carcasses came to finally rest. Loss of skeletal completeness was subsequent to arrival at the seabed and as a result of weak bottom current activity that also affected Serpianosaurus.

Keywords

Triassic Marine reptiles Besano Formation Taphonomy Palaeoecology 

Notes

Acknowledgements

We thank Patrick Orr for helpful discussion throughout this study. We also thank Silvio Renesto and Nick Fraser for their comments and improvements to the manuscript. Research was conducted as part of a Ph.D project at University College Dublin, funded by the Irish Research Council for Science, Engineering and Technology (IRCSET).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

References

  1. Bassani, F. (1886). Sui fossili e sull’età degli schisti bituminosi triassici di Besano in Lombardia. Atti Società Italiana di scienze naturali, 29, 15–72.Google Scholar
  2. Beardmore, S. R. (2012). The skeletal taphonomy of vertebrates from the Triassic and Jurassic. Unpublished Ph.D, University College Dublin, Ireland, pp 272.Google Scholar
  3. Beardmore, S. R., Orr, P. J., Manzocchi, T., Furrer, H., & Johnson, C. (2012). Death, decay and disarticulation: a method of modelling the skeletal taphonomy of marine reptiles demonstrated using Serpianosaurus (Reptilia; Sauropterygia). Palaeogeography, Palaeoclimatololgy, Palaeoecology, 337, 1–13.Google Scholar
  4. Bernasconi, S. M. (1991). Geochemical and microbial controls on dolomite formation and organic matter production/preservation in anoxic environments: a case study from the Middle Triassic Grenzbitumenzone, Southern Alps (Ticino, Switzerland). PhD Thesis, Geological Institute of the ETH, Zürich, Switzerland.Google Scholar
  5. Bernasconi, S. M. (1994). Geochemical and microbial controls on dolomite formation in anoxic environments. A case study from the middle Triassic (Ticino, Switzerland). Contributions to sedimentology, 19, 1–109.Google Scholar
  6. Brack, P., & Rieber, H. (1993). Towards a better definition of the Anisian/Ladinian boundary: new biostratigraphic data and correlations of boundary sections from the Southern Alps. Eclogae Geologicae Helvetiae, 86, 415–527.Google Scholar
  7. Brack, P., Rieber, H., Nicora, A., & Mundil, R. (2005). The global boundary stratotype section and point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale. Episodes, 28, 233–244.Google Scholar
  8. Brand, L. R., Hussey, M., & Taylor, J. (2003). Decay and disarticulation of small vertebrates in controlled experiments. Journal of Taphonomy, 1, 69–95.Google Scholar
  9. Brinkmann, W. (1994). (Hrsg., mit Beiträgen). In T. von Bolliger, W. Brinkmann, H. Furrer, K. A. Hünermann, H. Lanz, & H. Rieber (Eds.), Paläontologisches Museum der Universität Zürich. Führer durch die Ausstellung (p. 108 S). Zürich: Verlag Paläontologisches Institut und Museum Universität.Google Scholar
  10. Brinkmann, W., & De Baets, K. (2012). Paleontological Museum of the University of Zürich. Exhibition guide (p. 108). Zürich: Paleontological Institute and Museum of the University.Google Scholar
  11. Bürgin, T., Rieppel, O., Sander, P. M., & Tschanz, K. (1989). The fossils of Monte San Giorgio. Scientific American, 260, 50–57.CrossRefGoogle Scholar
  12. Cox, B. (1975). The longest-necked lizard? Nature, 254, 654–655.CrossRefGoogle Scholar
  13. Dalla Vecchia, F. B. (2000). Tanystropheus (Archosauromorpha, Prolacertiformae) remains from the Triassic of Northern Friuli (NE Italy). Rivista Italiana di Paleontologia e Stratigrafia, 106, 135–140.Google Scholar
  14. Diedrich, C. (2008). Millions of reptile tracks—Early to Middle Triassic carbonate tidal flat migration bridges of Central Europe—reptile immigration into the Germanic Basin. Palaeogeography, Palaeoclimatology, Palaeoecology, 259, 410–423.CrossRefGoogle Scholar
  15. Efremov, J. A. (1940). Taphonomy: a new branch of paleontology. Pan-American Geologist, 74, 81–93.Google Scholar
  16. Fraser, N. C., & Rieppel, O. (2006). A new protorosaur (Diapsida) from the Upper Bundsandstein of the Black Forest, Germany. Journal of Vertebrate Paleontology, 26, 866–871.CrossRefGoogle Scholar
  17. Furrer, H. (1995). The Kalkschieferzone (Upper Meride Limestone; Ladinian) near Meride (Canton Ticino, Southern Switzerland) and the evolution of a Middle Triassic intraplatform basin. Eclogae Geologicae Helvetiae, 88, 827–852.Google Scholar
  18. Furrer, H. (2003). Der Monte San Giorgio im Südtessin—vom Berg der Saurier zur Fossil-Lagerstätte internationaler Bedeutung. Neujahrsblatt der Naturforschenden Gesellschaft Zürich, 206, 64.Google Scholar
  19. Furrer, H., & Vandelli, A. (2014). Guide to the museum of fossils from Monte San Giorgio Meride. Fondazione del Monte San Giorgio, Meride, pp 128. ISBN 978-88-940067-2-8.Google Scholar
  20. Hammer, Ø., Harper, D. A. T., & Ryan, P. D. (2001). PAST: Paleontological Statistics Software Package for Education and Data Analysis. Palaeontologia Electronica, 4(1), 9. http://palaeo-electronica.org/2001_1/past/issue1_01.htm.
  21. Haubold, H. A. (1983). Archosaur evidence in the Buntsandstein (Lower Triassic). Acta Palaeontologica Polonica, 28, 123–132.Google Scholar
  22. Hugi, J., Scheyer, T. M., Sander, P. M., Klein, N., & Sánchez-Villagra, M. R. (2011). Long bone microstructure gives new insights into the life of pachypleurosaurids from the Middle Triassic of Monte San Giorgio, Switzerland/Italy. Comptes Rendus Palevol, 10(5), 413–426.CrossRefGoogle Scholar
  23. Krebs, B. (1965). Die Triasfauna der Tessiner Kalkalpen, XIX. Ticinosuchus ferox nov. gen. nov. sp. Schweizerische Paläontologische Abhandlungen, 81, 1–140.Google Scholar
  24. Kuhn-Schnyder, E. (1974). Die Triasfauna der Tessiner Kalkalpen. Neujahrsblatt der Naturforschenden Gesellschaft Zürich, 176, 1–119.Google Scholar
  25. Li, C., Rieppel, O., & LaBarbera, M. C. (2004). A Triassic aquatic protorosaur with an extremely long neck. Science, 305, 1111–1113.Google Scholar
  26. Melville, R. V., & Freshney, E. C. (1982). British regional geology: the Hampshire Basin and adjoining areas (Fourth ed.). London: Her Majesty’s Stationary Office.Google Scholar
  27. Meyer, H. V. (1847-1855). Zur Fauna der Vorvelt. Zweite Abteilung Die Saurier des Muschelkalks mit Rücksicht auf die Saurier aus Buntem Sandstein und Keuper (p. 167). Frankfurt am Main: Keller.Google Scholar
  28. Mundil, R., Palfy, J., Renne, P. R., & Brack, P. (2010). The Triassic timescale: New constraints and a review of geochronological data. Geological Society of London, Special Publications, 334, 41–60.Google Scholar
  29. Nosotti, S. (2007). Tanystropheus longobardicus Reptilia, Protorosauria: reinterpretation of the anatomy based on new specimens from the Middle Triassic of Besano (Lombardy, northern Italy). Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naurale di Milano, 35(3), 88.Google Scholar
  30. Peyer, B. (1931). Die Triasfauna der Tessiner Kalkalpen. II. Tanystropheus longobardicus BASS sp. Abhandlungen der Schweizerischen Paläontologischen Gesellschaft, 50, 5–110.Google Scholar
  31. Reisdorf, A. G., & Wuttke, M. (2012). Re-evaluating Moodie’s opisthotonic-posture hypothesis in fossil vertebrates part I: reptiles—the taphonomy of the bipedal dinosaurs Compsognathus longipes and Juravenator starki from the Solnhofen Archipelago (Jurassic, Germany). Palaeobiodiversity and Palaeoenvironments, 92, 119–168.Google Scholar
  32. Reisdorf, A. G., Bux, R., Wyler, D., Benecke, M., Klug, C., Maisch, M. W., Fonaro, P., & Wetzel, A. (2012). Float, explode or sink: post-mortem fate of lung-breathing marine vertebrates. Palaeobiodiversity and Palaeoenvironments92, 67–81.Google Scholar
  33. Renesto, S. (2005). A new specimen of Tanystropheus (Reptilia Protorosauria) from the Middle Triassic of Switzerland and the ecology of the genus. Rivista Italiana di Paleontologia e Stratigrafia, 11, 377–394.Google Scholar
  34. Renesto, S. (2006). Peculiar preservation of a juvenile pachypleurosaurid from Besano, Italy. Rivista Italiana di Paleontologia e Stratigrafia, 112, 373–382.Google Scholar
  35. Renesto, S., & Dalla Vecchia, F. M. (2000). The unusual dentition and feeding habits of the prolacertiform reptile Langobardisaurus (Late Triassic, Northern Italy). Journal of Vertebrate Paleontology, 20(3), 622–627.CrossRefGoogle Scholar
  36. Rieppel, O. (1989a). The hind limb of Macrocnemus bassanii (Nopsca) (Reptilia, Sauropterygia): development and functional anatomy. Journal of Vertebrate Paleontology, 9, 373–387.CrossRefGoogle Scholar
  37. Rieppel, O. (1989b). A new pachypleurosaurid (Reptilia, Sauropterygia) from the Middle Triassic of Monte San Giorgio, Switzerland. Philosophical Transactions of the Royal Society of London B, 323, 1–73.CrossRefGoogle Scholar
  38. Rieppel, O. (2010). Tanystropheus cf. T. longobardicus from the early Late Triassic of Guizhou Province, southwestern China. Journal of Vertebrate Paleontology, 30, 1082–1089.Google Scholar
  39. Röhl, H. J., Schmid-Röhl, A., Furrer, H., Frimmel, A., Oschmann, W., & Schwark, L. (2001). Microfacies, geochemistry and palaeoecology of the Middle Triassic Grenzbitumenzone from the Monte San Giorgio (Canton Ticino, Switzerland). Geologia Insubrica, 6, 1–13.Google Scholar
  40. Sander, P. M. (1989). The pachypleurosaurids (Reptilia: Nothosauria) from the Middle Triassic of Monte San Giorgio (Switzerland) with the description of a new species. Philosophical Transactions of the Royal Society of London B: Biological Sciences, 325(1230), 561–666.CrossRefGoogle Scholar
  41. Schäfer, W. (1972) (translated version). Ecology and palaeoecology in marine environments (pp. 1–568). Chicago: The University of Chicago Press.Google Scholar
  42. Stockar, R., Baumgartner, P. O., & Condon, D. (2012). Integrated Ladinian bio-chronostratigraphy and geochrononology of Monte San Giorgio (Southern Alps, Switzerland). Swiss Journal of Geosciences, 105, 85–108.CrossRefGoogle Scholar
  43. Tschanz, K. (1988). Allometry and heterochrony in the growth of the neck of Triassic prolacertiform reptiles. Palaeontology, 31, 997–1011.Google Scholar
  44. Wild, R. (1973). Die Triasfauna der Tessiner Kalkalpen XXIII Tanystropheus longobardicus (Bassani). Schweizerische Paläontologische Abhandlungen, 95, 1–162.Google Scholar
  45. Wild, R. (1980). Die Triasfauna der Tessiner Kalkalpen. XXIV. Neue Funde von Tanystropheus (Reptilia, Squamata). Schweizerische Paläontologische Abhandlungen, 102, 1–43.Google Scholar

Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Elgin MuseumElginScotland
  2. 2.Paläontologisches Institut und Museum der Universität ZürichZürichSwitzerland

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