Morphological restudy of the type species of Xibeiestheria (Spinicaudata) from the lower Aptian,northwestern China |
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| Institution: | 1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, People''s Republic of China;2. Lebanese University, Faculty of Sciences II, Department of Biology, Fanar Matn, P.O. Box 26110217, Lebanon;3. Institut de Systématique, Évolution, Biodiversité, ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;4. Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, D-70191, Stuttgart, Germany;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, People''s Republic of China;2. Institut de Systématique, Évolution, Biodiversité, ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;3. Biologic Institute, 16310 NE 80th Street, Redmond, WA 98052, USA;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;2. Department of Earth Sciences, The University of Hong Kong, Hong Kong Special Administrative Region;3. Institut de Systématique, Évolution, Biodiversité, ISYEB-UMR 7205-CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;4. Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK;5. Goglio (Tianjin) Packaging Co. Ltd, No. 99, West 11th Avenue, Airport Economic Area, Tianjin, China;6. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;1. Post Graduate Department of Geology, University of Jammu, Jammu 180 006, India;2. Department of Geology, Centre for Advanced Studies, University of Delhi, Delhi 110 007, India;3. Jammu and Kashmir State Power Development Corporation Limited, Jammu 180 006, India;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK;3. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;4. Department of Earth Sciences, University of Hong Kong, Hong Kong Special Administrative Region, China |
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| Abstract: | The fossil clam shrimp genus Xibeiestheria Wang in Shen et al., 1982, a component of the well-known Early Cretaceous Yanjiestheria fauna, was originally described from the lower Aptian Jingchuan Formation of Yanchi County, Ningxia Hui Autonomous Region of northwestern China. The morphological re-examination under an SEM of the holotype of the type species Xibeiestheria pora Wang in Shen et al., 1982 has revealed new taxonomic features not previously recognized. These include: (1) growth lines with serrated lower margins, having a row of small pores; (2) widely spaced radial lirae intercalated cross bars on growth bands in the dorsal part of the carapace; (3) fine reticulum occurring within coarse reticulation on growth bands in the middle part of the carapace; (4) puncta radially aligned along the widely spaced radial lirae on growth bands in the lower part of the carapace. |
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| Keywords: | Clam shrimp Taxonomy Lower Cretaceous Zhidan Group China |
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