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A Late Cretaceous ceratopsian dinosaur from Europe with Asian affinities

机译：来自欧洲的具有亚洲亲缘关系的晚白垩世ceratosian恐龙

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摘要

Ceratopsians (horned dinosaurs) represent a highly diverse and abundant radiation of non-avian dinosaurs known primarily from the Cretaceous period (65-145 million years ago). This radiation has been considered to be geographically limited to Asia and western North America, with only controversial remains reported from other continents. Here we describe new ceratopsian cranial material from the Late Cretaceous of Iharkut, Hungary, from a coronosaurian ceratopsian, Ajkaceratops kozmai. Ajkaceratops is most similar to 'bagaceratopsids' such as Bagaceratops and Magnirostris, previously known only from Late Cretaceous east Asia. The new material unambiguously demonstrates that ceratopsians occupied Late Cretaceous Europe and, when considered with the recent discovery of possible leptoceratopsid teeth from Sweden, indicates that the clade may have reached Europe on at least two independent occasions. European Late Cretaceous dinosaur faunas have been characterized as consisting of a mix of endemic 'relictual' taxa and 'Gondwanan' taxa, with typical Asian and North American groups largely absent. Ajkaceratops demonstrates that this prevailing biogeographical hypothesis is overly simplified and requires reassessment. Iharkut was part of the western Tethyan archipelago, a tectonically complex series of island chains between Africa and Europe, and the occurrence of a coronosaurian ceratopsian in this locality may represent an early Late Cretaceous 'island-hopping' dispersal across the Tethys Ocean.
机译：角龙恐龙（Ceratopsians）（角恐龙）代表着非鸟类恐龙的高度多样化和丰富的辐射，这些恐龙主要来自白垩纪（65-145百万年前）。人们认为这种辐射在地理上仅限于亚洲和北美西部，只有其他大陆报告有争议的遗骸。在这里，我们描述了来自匈牙利Iharkut晚白垩世的一种新的角龙属颅骨材料，一种冠龙角龙的角质龙Ajkaceratops kozmai。 Ajkaceratops与“ bagaceratopsids”最相似，例如Bagaceratops和Magnirostris，以前仅从晚白垩纪东亚才知道。新材料清楚地表明，角足类动物已占领了晚白垩纪的欧洲，并且考虑到最近发现瑞典可能存在的瘦骨龙齿，这表明该进化枝可能至少有两次独立地到达了欧洲。欧洲晚白垩世恐龙动物群的特征是由地方性的“遗物”类群和“冈瓦南”类群组成，而典型的亚洲和北美群则很少。 Ajkaceratops证明了这种普遍存在的生物地理学假设被过度简化，需要重新评估。伊哈库特（Iharkut）是西部特提斯群岛的一部分，该构造是非洲和欧洲之间一系列构造复杂的岛链，并且在该地区出现冠龙角龙属可能代表了早白垩纪特提斯洋的“孤岛跳跃”扩散。

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  • 来源
    《Nature》 |2010年第7297期|p.466-468|共3页
  • 作者

    Attila OEsi; Richard J. Butler; David B. Weishampel;

  • 作者单位

    Hungarian Academy of Sciences, Hungarian Natural History Museum, Research Group for Paleontology, Ludovika ter 2, Budapest 1083, Hungary;

    Bayerische Staatssammlung fuer Palaeontologie und Geologie, Richard-Wagner-Strasse 10, Munich 80333, Germany;

    Center for Functional Anatomy and Evolution, Johns Hopkins University, Baltimore, Maryland 21205, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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