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The coprolite Lumbricaria Münster in the Early Tithonian of the Neuquén Basin, Argentina: new evidence for a holothurian producer

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Abstract

Lumbricaria Münster is described for the first time outside the Tethys domain from distal facies of the Tithonian Vaca Muerta Formation, Neuquén Basin, Argentina. The studied material consists of elongate, convolute, cylindrical coprolites, showing an overlapping pattern, and commonly exhibiting constrictions. Internally, coprolites show a densely packed fabric, where the particles show the distinctive morphology of saccocomid ossicles. These specimens are assigned to Lumbricaria intestinum Münster and three morphotypes are defined: (a) morphotype 1 shows a disordered convolute structure; (b) morphotype 2 is shorter and has a non-convolute arrangement; and (c) morphotype 3 has a spiral arrangement. Coprolites are preserved within microbial laminites, as well as concretions in calcareous mudstones. In this paper we discuss the possible producers of these coprolites, where evidence from the studied material would support a holothurian producer.

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Acknowledgements

This research has been done under the framework of the Agencia Nacional de Promoción de la Ciencia y Tecnología PICT-2016-3762 project. We are indebted to Dr. Alberto C. Riccardi (Universidad Nacional de La Plata y Museo, Argentina) for ammonite identifications, and to Dr. Lijun Zhang (China University of Geosciences, Wuhan) for providing us with bibliography and helping us with the translation of papers in Chinese We are also especially grateful to the Barros family for their hospitality and for allowing us to work in their property. We thank the valuable reviews by Brian R. Pratt, Günter Schweigert, and an anonymous reviewer, as well as the PalZ Editor-in-Chief Mike Reich, which allowed us to improve the original manuscript.

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  1. Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón II, Intendente Güiraldes 2160, C1428EHA, Buenos Aires, Argentina

    Diego A. Kietzmann & Graciela S. Bressan

  2. Instituto de Geociencias Básicas, Ambientales y Aplicadas de Buenos Aires (IGeBA), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina

    Diego A. Kietzmann

  3. Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina

    Graciela S. Bressan

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Kietzmann, D.A., Bressan, G.S. The coprolite Lumbricaria Münster in the Early Tithonian of the Neuquén Basin, Argentina: new evidence for a holothurian producer. PalZ 93, 357–369 (2019). https://doi.org/10.1007/s12542-019-00447-0

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