Ecology, systematics and biogeographical relationships of dinosaurs, including a new theropod, from the Santana Formation (?Albian, Early Cretaceous) of Brazil.
Ecology, systematics and biogeographical relationships of dinosaurs, including a new theropod, from the Santana Formation (?Albian, Early Cretaceous) of Brazil.
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DOI：
10.1080/08912960410001674200
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发表时间：
2004-06-01
影响因子：
1.4
通讯作者：
Frey, Eberhard
中科院分区：
文献类型：
--
作者：
Naish, Darren;Martill, David M.;Frey, Eberhard
恐龙虽然罕见，但在桑塔纳组（早白垩世，？巴西东北部阿拉里皮盆地的阿尔比恩人。到目前为止，只包括一个棘龙科和三个腔上龙，恐龙动物群似乎depaplate。在其他恐龙稀少或不存在的组合中，兽脚类恐龙的高度多样性并不是桑塔纳组所独有的。它也出现在其他几个组合中，包括Solnhofen和马达加斯加的Maevarano组。我们考虑了几个因素，包括发生intraguild捕食，小兽脚类动物可以在边缘环境中生存的可能性，以及对沿海资源的依赖，这可能是负责这种明显的生态失衡。在桑塔纳组中发现了一种新的腔上龙，这里正式命名为Mirischia asymmetrica，它与Santanaraptor placidus（Kellner，A.W.A.（1999）“Short note on a new dinosaur（Theropoda，Coelurosauria）from the桑塔纳Formation（Romualdo Member，Albian）northeastern Brazil”，Boletim do Museu Nacional，Nova Serie，Rio de Janeiro，Brasil 49，1-8）.本文还对桑塔纳组的其他兽脚类恐龙作了简要评述。Mirischia是一个compsognathid，更类似于欧洲Compsognathus比亚洲Sinosauropteryx。
Although rare, dinosaurs are well preserved in calcareous nodules of the Santana Formation (Early Cretaceous, ?Albian) of the Araripe Basin, in northeastern Brazil. So far, including only a spinosauroid and three coelurosaurs, the dinosaur fauna appears depauperate. High theropod diversity in assemblages where other dinosaurs are rare or absent is not unique to the Santana Formation. It is seen also in several other assemblages, including Solnhofen and the Maevarano Formation of Madagascar. We consider several factors, including the occurrence of intraguild predation, the possibility that small theropods could subsist in marginal environments, and reliance on coastal resources, that may have been responsible for this apparent ecological imbalance. A new coelurosaur from the Santana Formation, here formally named Mirischia asymmetrica, is shown to be distinct from Santanaraptor placidus (Kellner, A.W.A. (1999) "Short note on a new dinosaur (Theropoda, Coelurosauria) from the Santana Formation (Romualdo Member, Albian) northeastern Brazil", Boletim do Museu Nacional, Nova Serie, Rio de Janeiro, Brasil 49, 1-8). Other theropods from the Santana Formation are briefly reviewed. Mirischia is a compsognathid, more similar to the European Compsognathus than to the Asian Sinosauropteryx.