New alvarezsaurid (Dinosauria, Theropoda) from uppermost Cretaceous of north-western Patagonia with associated eggs
New alvarezsaurid (Dinosauria, Theropoda) from uppermost Cretaceous of north-western Patagonia with associated eggs
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DOI：
10.1016/j.cretres.2011.11.014
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发表时间：
2012-06-01
影响因子：
2.1
通讯作者：
Kundrat, Martin
中科院分区：
文献类型：
--
作者：
Agnolin, Federico L.;Powell, Jaime E.;Kundrat, Martin
阿尔瓦雷兹龙科是独特的基底腔上龙类的一个分支，其白垩纪辐射分布在世界各地。本文描述了采自阿根廷北方巴塔哥尼亚坎帕尼亚期马斯特里赫特阶地层中的一个新成员，Bonapartenykus ultimus gen. et sp. nov.。波拿巴提尼库斯的代表是一个单一的，不完整的颅后骨骼。已知的骨骼元素的形态表明与先前描述的巴塔哥尼亚，Patagonykus分类群的密切关系，都符合一个新的分支，这里称为Patagonykinae新。两个不完整的鸡蛋已被发现在与Bonapartenykus的骨骼遗骸，几个集群的破碎的蛋壳相同的身份也被发现在一个非常接近。这些属于新的ooparataxon Arriagadoolithus patagoniensis的新的Oofamily Arriagadoolithidae，这提供了第一次深入了解独特的外壳微观结构和真菌污染的鸡蛋所产的alvarezsaurid兽脚亚目。对这些蛋的详细研究，为阿瓦雷兹龙科在兽脚类中的系统发育位置，以及空尾龙类中蛋的进化提供了新的线索。我们认为，近形alvarezsaurids生存在巴塔哥尼亚，直到最近的白垩纪，而这些基础形式在其他地方灭绝。(C)2011爱思唯尔有限公司保留所有权利。
The Alvarezsauridae represents a branch of peculiar basal coelurosaurs with an increasing representation of their Cretaceous radiation distributed worldwide. Here we describe a new member of the group, Bonapartenykus ultimus gen. et sp. nov. from Campanian Maastrichtian strata of Northern Patagonia, Argentina. Bonapartenykus is represented by a single, incomplete postcranial skeleton. The morphology of the known skeletal elements suggests close affinities with the previously described taxon from Patagonia, Patagonykus, and both conform to a new clade, here termed Patagonykinae nov. Two incomplete eggs have been discovered in association with the skeletal remains of Bonapartenykus, and several clusters of broken eggshells of the same identity were also found in a close proximity. These belong to the new ooparataxon Arriagadoolithus patagoniensis of the new oofamily Arriagadoolithidae, which provides first insights into unique shell microstructure and fungal contamination of eggs laid by alvarezsaurid theropods. The detailed study of the eggs sheds new light on the phylogenetic position of alvarezsaurids within the Theropoda, and the evolution of eggs among Coelurosauria. We suggest that plesiomorphic alvarezsaurids survived in Patagonia until the latest Cretaceous, whereas these basal forms became extinct elsewhere. (C) 2011 Elsevier Ltd. All rights reserved.