A new afrograptid (Diplostraca: Estheriellina) from the Lower Cretaceous of southern England |
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| Institution: | 1. Geological Institute, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Str. 2, 09599 Freiberg, Germany;2. Department of Applied and Environmental Geology, The University of Jordan, Amman 11942, Jordan;3. Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya str. 123, 117997 Moscow, Russia;4. Kazan Federal University, Kremlyovskaya str. 18, 420008 Kazan, Russia;5. Urweltmuseum GEOSKOP, Burg Lichtenberg, Burgstr. 19, 66871 Thallichtenberg, Germany;6. Senckenberg Forschungsinstitut und Naturmuseum Frankfurt, Senckenberganlage 25, 60325 Frankfurt, Germany;1. Research Institute of Petroleum Exploration & Development (RIPED), PetroChina, No.20 Xueyuan Road, P. O. Box 910, Beijing 100083, PR China;2. China University of Petroleum (Beijing), No.18 Fuxue Road, Beijing 102249, PR China;3. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom |
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| Abstract: | The Family Afrograptidae is a ‘conchostracan’ group with multiple radial costae reaching to the umbo on their carapaces. It comprises four described genera: Afrograpta, Camerunograpta, Congestheriella and Graptoestheriella with a total of thirteen described species which are occasionally reported from the Jurassic and the Cretaceous in Africa, Europe and South America (i.e. Afrograpta from the Upper Cretaceous of Cameroon; Camerunograpta from the Jurassic to Cretaceous of Cameroon; Congestheriella from the Jurassic to Upper Cretaceous of the Congo Basin, Brazil, Bulgaria, Venezuela and Argentina; and Graptoestheriella from the Upper Jurassic to Lower Cretaceous of Brazil). A new genus and a new species, Surreyestheria ockleyensis gen. et sp. nov., belonging to the Family Afrograptidae from the Lower Cretaceous (lower Barremian) Upper Weald Clay Formation of Ockley Village, Surrey County, southern England is described in this paper. The new genus mainly differs from the other four genera by the special reticulate ornamentation on its carapace. It indicates that the Family Afrograptidae was more diverse and more widely distributed in the late Mesozoic than previously supposed. Afrograptidae is a special branch of Estheriellina the latter originating in the late Palaeozoic and the former in the early Mesozoic. Afrograptids, as a whole had been widespread across Pangea in the Early Jurassic. |
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| Keywords: | Conchostracans Estheriellina Afrograptidae Early Cretaceous Upper Weald Clay Formation |
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