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New early Jurassic decapod crustacean from Patagonia (Chubut province), Argentina

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Abstract

A well-preserved decapod specimen was found in early Toarcian deposits cropping out on the western slope of Meseta Catreleo, central Chubut province, Argentina. It is a nearly complete exoskeleton preserved in lateral view, slightly crushed, in fine-grained sandstones. The skeleton is mostly articulated, though some pieces are disarticulated or missing. Taphonomic features indicate a relatively rapid burial after death, with little or no transport. This specimen is here described as a new species of the genus Mecochirus Germar (Decapoda: Glypheoidea). Mecochirus robbianoi n. sp. is characterized by a very long, achelate, first pair of pereiopods with a narrow, long, straight dactylus, a thin carapace ornamented by low tubercules, with a slightly oblique cervical groove and a short acute rostrum. The family Mecochiridae arose in the Triassic, but the group diversified during the Early Jurassic. Mecochirus had a wide geographical distribution and is known for sure from Lower Jurassic to Upper Cretaceous deposits. The new record from Chubut is one of the oldest for the genus, the oldest for South America, and the first for Argentina, thus considerably extending the known distribution of the genus during the Early Jurassic.

Kurzfassung

Ein gut erhaltener Decapode wurde in Ablagerungen des unteren Toarciums auf der Westseite der Meseta Catreleo im Zentrum der Provinz Chubut (Argentinien) gefunden. Es handelt sich um ein fast komplett erhaltenes Exoskelett, welches in einem feinkörnigem Sandstein leicht verdrück in Seitenlage eingebettet ist. Die taphonomische Analyse deutet auf eine rasche Einbettung nach dem Tod, mit nur geringem oder fehlendem Transport. Das hier beschriebene Exemplar wird als neue Art der Gattung Mecochirus Germar (Decapoda: Glypheoidea), M. robbianoi n. sp., beschrieben. Sie zeichnet sich durch ein sehr langes, achelates Paar der ersten Pereiopoden mit schmalen, langem, geradem Daktylus, einem mit flachen Tuberkeln verzierten Carpax mit leicht gerundeter Cervicalfurche und ein kurzes, spitzes Rostrum aus. Die Familie Mecochiridae erschien in der Trias; im Unterjura kam es zu einer Diversifikation. Mecochirus hatte eine weite paläogeographische Verbreitung und ist vom Unterjura bis in die Oberkreide mit Sicherheit bekannt. Die neue Art ist eine der ältesten der Gattung, die älteste aus Südamerika und zugleich der erstnachweis aus Argentinien. Dies weist auf eine viel größere Verbreitung im Unterjura hin als bisher angenommen.

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Acknowledgments

Field work was supported by the Museo Egidio Feruglio, Trelew and Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. We are grateful to P. Puerta, M. Caffa and L. Canessa for their help during field work and for technical aid during preparation of the specimen, and to R. Romero who drew figure 2c. MEB photographs were taken at the laboratories of Aluar S.A. in Puerto Madryn (Chubut) with the help of J. Groizar. The ammonites were kindly identified by A.C. Riccardi (La Plata Natural Sciences Museum). H. Campbell, M. Terezow, J. Simes (DSIR, New Zealand) and R. Gardner (New Zealand), helped with casting and photographying of Mecochirus comparative material from New Zealand. We also thank E. Cerdeño (Museo de Historia Natural de Mendoza, Argentina) for her help to locate and examine Rusconi′s material, and Erika Holjevac (MEF) for the German translation of the abstract. We likewise acknowledge useful comments from two anonymous reviewers and the journal editor, which helped to improve the manuscript.

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  1. Museo Paleontológico “Egidio Feruglio”, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Fontana 140, U9100GYO, Trelew, Chubut, Argentina

    M. A. Pagani & S. M. Ferrrari

  2. Museo de Ciencias Naturales La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Paseo del Bosque s/n, A1900FWA, La Plata, Argentina

    S. E. Damborenea & M. O. Manceñido

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  1. M. A. Pagani
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Pagani, M.A., Damborenea, S.E., Manceñido, M.O. et al. New early Jurassic decapod crustacean from Patagonia (Chubut province), Argentina. Paläontol Z 85, 143–154 (2011). https://doi.org/10.1007/s12542-010-0082-9

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  • DOI: https://doi.org/10.1007/s12542-010-0082-9

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