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      Cranial anatomy ofThalassiodracon hawkinsii(Reptilia, Plesiosauria) from the Early Jurassic of Somerset, United Kingdom

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      Journal of Vertebrate Paleontology

      Informa UK Limited

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          Tooth morphology and prey preference of Mesozoic marine reptiles

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            Mesozoic marine tetrapod diversity: mass extinctions and temporal heterogeneity in geological megabiases affecting vertebrates.

            The fossil record is our only direct means for evaluating shifts in biodiversity through Earth's history. However, analyses of fossil marine invertebrates have demonstrated that geological megabiases profoundly influence fossil preservation and discovery, obscuring true diversity signals. Comparable studies of vertebrate palaeodiversity patterns remain in their infancy. A new species-level dataset of Mesozoic marine tetrapod occurrences was compared with a proxy for temporal variation in the volume and facies diversity of fossiliferous rock (number of marine fossiliferous formations: FMF). A strong correlation between taxic diversity and FMF is present during the Cretaceous. Weak or no correlation of Jurassic data suggests a qualitatively different sampling regime resulting from five apparent peaks in Triassic-Jurassic diversity. These correspond to a small number of European formations that have been the subject of intensive collecting, and represent 'Lagerstätten effects'. Consideration of sampling biases allows re-evaluation of proposed mass extinction events. Marine tetrapod diversity declined during the Carnian or Norian. However, the proposed end-Triassic extinction event cannot be recognized with confidence. Some evidence supports an extinction event near the Jurassic/Cretaceous boundary, but the proposed end-Cenomanian extinction is probably an artefact of poor sampling. Marine tetrapod diversity underwent a long-term decline prior to the Cretaceous-Palaeogene extinction.
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              Assessing the record and causes of Late Triassic extinctions

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                Author and article information

                Journal
                Journal of Vertebrate Paleontology
                Journal of Vertebrate Paleontology
                Informa UK Limited
                0272-4634
                1937-2809
                May 2011
                May 2011
                : 31
                : 3
                : 562-574
                10.1080/02724634.2011.572937
                © 2011

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