A new aquatic crustacean (Isopoda: Cymothoida) from the early Cretaceous of southern England and comparison with the Chinese and Iberian biotas |
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Authors: | Edmund A Jarzembowski B Wang Y Fang H Zhang |
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Institution: | 1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, People''s Republic of China;2. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;3. Steinmann Institute, University of Bonn, 53115 Bonn, Germany |
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Abstract: | The first malacostracan crustacean is described and named from the English Wealden, Cymothoidana websteri gen. et sp. nov., a Cirolana-like, cymothoidan isopod. The problem of homoplastic convergence in somatic characters is discussed, and Cymothoidana is treated as a collective group (morphotaxon) under the International Code of Zoological Nomenclature for cirolanoid and cymothooid fossils which cannot be assigned to natural taxa on preservational grounds. The palaeoecology of early Cretaceous peracaridan malacostracans is considered, including the spelaeogriphaceans Liaoningogriphus from China (Jehol biota), and Spinogriphus from Spain (Las Hoyas Konservat-lagerstätte). There were probably no true stygobites, Spinogriphus perhaps a crenobite, but the colonisation of reduced salinity environments (Cymothoidana) and freshwater lakes (Liaoningogriphus) had commenced. |
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Keywords: | Isopod Wealden New taxa Spelaeogriphacea Yixian Palaeoecology |
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