Revision of the conchostracan genus Estherites from the Upper Cretaceous Nenjiang Formation of the Songliao Basin and its biogeographic significance in China |
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| Authors: | Gang Li David J Batten |
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| Institution: | aNanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 210008 Nanjing, PR China;bSchool of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, and Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK |
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| Abstract: | The diagnosis of Estherites corrugatus from the basal part of the Coniacian Second Member of the Nenjiang Formation in Nenjiang County, north-east China is revised following the application of a new preparation technique to some of the carapaces and an examination of specimens under a scanning electron microscope, both of which revealed morphological features on the carapace that had not been recognized previously. Restudy of the type species of the two subgenera Estherites (Euestherites) and Estherites (Parestherites) also revealed details of carapace features not seen hitherto. These indicate that they should be separated from Estherites. As a result, Euestherites is upgraded to genus level and Parestherites is placed in synonymy. The importance of Estherites and Euestherites is considered in the context of Late Cretaceous assemblages of these crustaceans and the three conchostracan provinces (South-West, South-East and North China) that are recognized to have been present in China during the Turonian–Santonian period. |
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| Keywords: | Conchostraca Estherites Euestherites Upper Cretaceous Nenjiang Formation China |
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