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【2016斑龙类】维恩猎龙 Wiehenvenator——德国西北部中侏罗世新斑龙类恐龙

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发表于 2016-8-31 15:21:48 | 显示全部楼层 |阅读模式
新恐龙发布
德国西北部中侏罗世(卡洛夫期)新斑龙科恐龙和分析侏罗纪兽脚类的交替事件演化——阿氏 维恩猎龙 Wiehenvenator albati
 楼主| 发表于 2016-8-31 16:17:31 | 显示全部楼层
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 楼主| 发表于 2016-8-31 15:23:21 | 显示全部楼层
德国西北部侏罗世晚期(卡洛夫期)新斑龙科恐龙;对侏罗纪兽脚类恐龙进化和动物群交替事件的含意
  
Wiehenvenator albati
阿氏 维恩猎龙
(新属、新种)
   
A new megalosaurid theropod dinosaur from the late Middle Jurassic (Callovian) of north-western Germany: Implications for theropod evolution and faunal turnover in the Jurassic
Oliver W.M.Rauhut, Tom R. Hübner, and Klaus-Peter Lanser
  
Abstract
Fragmentary remains of a large, robustly builttheropod dinosaur were recovered from the marine middle Callovian OrnatentonFormation of north-eastern Northrhine-Westphalia, Germany. The specimenincludes a premaxilla, maxilla, lacrimal, postorbital, dentary, several caudalvertebrae, ribs, fibulae, astragalus, and partial calcaneum. It is heredescribed as a new species of megalosauroid, Wiehenvenator albati n. gen. n.sp., diagnosed by a strongly reduced maxillary antorbital fossa on the base ofthe ascending process of the maxilla, a very short anterior ramus of thelacrimal with an additional pneumatic depression anteroventral to the lacrimalfenestra, a transversely expanded orbital facet in the postorbital, and alaterally flexed proximal end of the ascending process of the astragalus.Phylogenetic analysis recovers Wiehenvenator as a megalosaurine megalosaurid,sister taxon to the Late Jurassic genus Torvosaurus. It thus adds to theconsiderable diversity of megalosauroids in the Middle Jurassic. Atime-calibrated phylogeny of theropods indicates a rapid radiation ofaverostran theropods between the Toarcian and the Bathonian. This radiation wasprobably triggered by the Pliensbachian-Toarcian extinction event, which mighthave been more important for theropod evolution than the Triassic-Jurassicextinction. The fossil record indicates a faunal turnover from megalosauroiddominated Middle Jurassic to allosauroid / coelurosaur dominated Late Jurassicfaunas. However, differences in the Middle and Late Jurassic theropod fossilrecords both in respect to geographic distribution of localities, as well assampled environments make this inference problematic, at least in respect toallosauroids. An analysis of environmental preferences of allosauroids andmegalosauroids indicates that the former preferred inland environments, whereasthe latter are more common in nearshore environments.
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 楼主| 发表于 2016-8-31 16:02:07 | 显示全部楼层
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 楼主| 发表于 2016-8-31 16:11:23 | 显示全部楼层
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 楼主| 发表于 2016-8-31 16:13:03 | 显示全部楼层
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 楼主| 发表于 2016-8-31 16:16:30 | 显示全部楼层
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发表于 2016-8-31 18:30:50 | 显示全部楼层
中侏罗世巨齿龙科的兴盛也只能代表欧洲自己的生态面貌吧,至少在东亚情况都不同。这东西在那个时代还是很大了。
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