UNIQUE MANIRAPTORAN EGG CLUTCH FROM THE UPPER CRETACEOUS TWO MEDICINE FORMATION OF MONTANA REVEALS THEROPOD NESTING BEHAVIOUR
UNIQUE MANIRAPTORAN EGG CLUTCH FROM THE UPPER CRETACEOUS TWO MEDICINE FORMATION OF MONTANA REVEALS THEROPOD NESTING BEHAVIOUR
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来自蒙大拿州上白垩纪两地层的独特手盗龙蛋离合器揭示了兽脚亚目恐龙的筑巢行为
DOI：
10.1111/j.1475-4983.2008.00815.x
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发表时间：
2008
期刊：
影响因子：
2.6
通讯作者：
F. Therrien
中科院分区：
文献类型：
--
作者：
D. Zelenitsky;F. Therrien
摘要：非鸟类马尼龙兽脚亚目(恐龙)的 卵很少见，特别是在北美，那里的伤齿龙是唯一已知的马尼龙离合器。在这里，我们描述了一种新的部分猛龙离巢和筑巢痕迹，指的是文冠花卵母细胞。等人来了。11月(Montanoolithidae oofam.Nov.)，来自蒙大拿州上白垩统的两个药物组。根据生殖特征的分支分析，我们推断这只幼虫要么属于鱼尾目，要么属于巨龙，这使它成为已知的第一个分类单元。这个标本保存了一个鸟巢结构上至少五个蛋的印记和蛋壳碎片。这些卵是不对称的，成对的，呈放射状排列在一个生物扰动的平顶砂岩丘的斜面上。当地的地质情况表明，雌性恐龙筑巢在植被稀少的新沉积沙子区域，可能靠近一条活跃的河道。这一离合器揭示了文昌鱼的产卵层在猛龙中具有一套独特的繁殖特征和筑巢行为。
Abstract: Egg clutches of non‐avian maniraptoran theropods (Dinosauria) are rare, particularly in North America where those of Troodon formosus are the only maniraptoran clutches known. Here we describe a new partial maniraptoran clutch and nesting trace referred to Montanoolithus strongorum oogen. et oosp. nov. (Montanoolithidae oofam. nov.), from the Upper Cretaceous Two Medicine Formation of Montana. Based on a cladistic analysis of reproductive traits, we infer that this clutch belonged either to a caenagnathid or to a dromaeosaurid, which makes it the first clutch known of either taxon. This specimen preserves impressions and eggshell fragments of at least five eggs on a nest structure. The eggs are asymmetrical, paired, and lay radially in a ring configuration on the sloped sides of a bioturbated, flat‐topped sandstone mound. Geology of the locality indicates the female nested in a poorly‐vegetated area of freshly deposited sand, possibly near an active river channel. This clutch reveals that the egg‐layer of Montanoolithus strongorum had a unique suite of reproductive characteristics and nesting behaviours among maniraptorans.