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Pereira, B. C., Benton M. J., Ruta M., & Mateus O. (2015).  Mesozoic echinoid diversity in Portugal: Investigating fossil record quality and environmental constraints on a regional scale. Palaeogeography, Palaeoclimatology, Palaeoecology. 424, 132 - 146. Abstractpereira_e_al_2015_mesozoic_echinoids_portugal.pdfWebsite

Abstract Several analyses of diversity through geological time use global, synoptic databases, and this practice often makes it difficult to distinguish true signals in changing diversity from regional-scale sampling and/or geological artefacts. Here we investigate how echinoid diversity changed through the Mesozoic of the Lusitanian basin in Portugal based on a comprehensive, revised database, and seek to distinguish biological signal from geological or environmental constraints. The observed diversity pattern is far from having a defined trend, showing many fluctuations that appear to be linked with gaps in the geological record. This study revealed that, independently of the method used, whether correlation tests or model fitting, the diversity signal is not completely explained by the studied sampling proxies. Among the different proxies, marine facies variation in combination with outcrop area best explains the palaeodiversity curve.

Mateus, O., Neto de Carvalho C., & Klompmaker A. A. (2013).  Decapod crustacean body and ichnofossils from the Mesozoic of Portugal. 5th Symposium on Mesozoic and Cenozoic Decapod Crustaceans. , 25–27 June 2013, Warszawa: Polish Geological Institute − National Research Institute & AGH University of Science and Technologymateus_et_al_2013_crustacea_mesozoic_portugal_5th_decapod_crustaceans_meeting_2013.pdf