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      An Updated Review of the Middle-Late Jurassic Yanliao Biota: Chronology, Taphonomy, Paleontology and Paleoecology

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          A Jurassic eutherian mammal and divergence of marsupials and placentals.

          Placentals are the most abundant mammals that have diversified into every niche for vertebrates and dominated the world's terrestrial biotas in the Cenozoic. A critical event in mammalian history is the divergence of eutherians, the clade inclusive of all living placentals, from the metatherian-marsupial clade. Here we report the discovery of a new eutherian of 160 Myr from the Jurassic of China, which extends the first appearance of the eutherian-placental clade by about 35 Myr from the previous record, reducing and resolving a discrepancy between the previous fossil record and the molecular estimate for the placental-marsupial divergence. This mammal has scansorial forelimb features, and provides the ancestral condition for dental and other anatomical features of eutherians.
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            THEROLE OFDECAY ANDMINERALIZATION IN THEPRESERVATION OFSOFT-BODIEDFOSSILS

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              A pre-Archaeopteryx troodontid theropod from China with long feathers on the metatarsus.

              The early evolution of the major groups of derived non-avialan theropods is still not well understood, mainly because of their poor fossil record in the Jurassic. A well-known result of this problem is the 'temporal paradox' argument that is sometimes made against the theropod hypothesis of avian origins. Here we report on an exceptionally well-preserved small theropod specimen collected from the earliest Late Jurassic Tiaojishan Formation of western Liaoning, China. The specimen is referable to the Troodontidae, which are among the theropods most closely related to birds. This new find refutes the 'temporal paradox'1 and provides significant information on the temporal framework of theropod divergence. Furthermore, the extensive feathering of this specimen, particularly the attachment of long pennaceous feathers to the pes, sheds new light on the early evolution of feathers and demonstrates the complex distribution of skeletal and integumentary features close to the dinosaur-bird transition.
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                Author and article information

                Journal
                Acta Geologica Sinica - English Edition
                Acta Geologica Sinica - English Edition
                Wiley
                10009515
                December 2016
                December 2016
                December 29 2016
                : 90
                : 6
                : 2229-2243
                Affiliations
                [1 ]Key Laboratory of Vertebrate Evolution and Human Origins; Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences; Beijing 100044 China
                [2 ]College of Life Sciences; Capital Normal University; Haidian District Beijing 100048 China
                Article
                10.1111/1755-6724.13033
                e67eead4-15e7-4d7a-8848-cb3c6d2fb8b6
                © 2016

                http://doi.wiley.com/10.1002/tdm_license_1.1

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