Palaeobiodiversity and Palaeoenvironments

, Volume 92, Issue 1, pp 45–65 | Cite as

From tree to shining sea: taphonomy of the arboreal lizard Geiseltaliellus maarius from Messel, Germany

Original Paper

Abstract

Much has been written about the palaeoenvironment of the middle Eocene fossil Lagerstätte of Messel, Germany, and of the taphonomy of the vertebrates found in it, but taphonomic phenomena among the reptiles in this locality are virtually unstudied. The iguanid Geiseltaliellus maarius is the most common lizard species in Messel. We present taphonomic data for this species and analyse it. Specimens of G. maarius can be divided into three preservation classes, one of which is distinguished purely by decompositional phenomena. Most specimens sank quickly to the bottom of Lake Messel after entering it, but one floated for some time prior to emplacement. In theory, overlying pressure should not preclude the accumulation of gases of decay in submerged carcasses. In one specimen, such gases appear to have built up intracoelomically for many weeks, but did not cause the carcass to rise because of overlying water pressure. Eruption of the gases through the oral and cloacal openings, possibly initiated by a coincident turbidity current, scattered the bones of the skull, the pelvic region, and the proximal part of the tail. G. maarius had evolved a form of intervertebral urotomy (pseudoautotomy), which is indicative of arboreal habits. The waxy substance adipocere, formed after breakdown of fat, has been neglected in discussions of taphonomy, but may constitute an important factor in stabilising carcasses and enabling three-dimensional preservation before diagensis.

Keywords

Taphonomy Adipocere Squamata Iguanidae Messel Autotomy Palaeoecology 

Notes

Acknowledgments

For discussions, we are grateful to Torsten Rossmann (Wiesbaden), Achim Reisdorf (Basel) and Jörg Habersetzer (Frankfurt). Kurt Goth (Dresden) kindly supplied the photomicrograph of Tetraedron. A. Reisdorf pointed out to us many very interesting, obscure papers. Anika Vogel (Frankfurt) assembled the figures and took all the photographs of G. maarius except that of the holotype, which was photographed by Wolfgang Fuhrmannek (Darmstadt). Preparation of the lizards was conducted by various people, most recently the difficult preparation of SMF ME 11304 and 11380 by Bruno Behr (Messel). Finally, we thank the reviewers (James Gardner, Rainer Schoch) as well as Achim Reisdorf for their careful readings and suggestions for improvement.

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Copyright information

© Senckenberg, Gesellschaft für Naturforschung and Springer 2011

Authors and Affiliations

  1. 1.Department of Paleoanthropology and Messel ResearchSenckenberg Research InstituteFrankfurt am MainGermany
  2. 2.Referat ErdgeschichteGeneraldirektion Kulturelles Erbe Rheinland-PfalzMainzGermany

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