Parataxonomic classification of ornithoid eggshell fragments from the Oldman Formation (Judith River Group; Upper Cretaceous), southern Alberta
Parataxonomic classification of ornithoid eggshell fragments from the Oldman Formation (Judith River Group; Upper Cretaceous), southern Alberta
复制标题
艾伯塔省南部奥德曼组（朱迪思河群；上白垩纪）鸟纲蛋壳碎片的副分类学分类
DOI：
10.1139/e96-126
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发表时间：
1996
影响因子：
1.4
通讯作者：
P. Currie
中科院分区：
文献类型：
--
作者：
D. Zelenitsky;L. Hills;P. Currie
对从阿尔伯塔省南部奥德曼地层收集的大量蛋壳碎片进行的检查表明，其鸟类分类学多样性比完整蛋或蛋蛋中已知的要多。根据蛋壳碎片，建立了鸟纲平胸鸟形态型的三个新卵属和卵种以及鸟纲棱柱形态型之一。 Porituberoolithus warnerensis oogen。等。十一月和Continuolithus canadensis oogen。等。十一月其微观结构与兽脚亚目恐龙的细长石类蛋相似。 Tristraguloolithus cracioides oogen。等。十一月和 Dispersituberoolithus exilis oogen。等。十一月具有外部区域，因此具有类似于现代鸟类蛋壳的微观结构。 Tristraguloolithus 的壳厚度、微观结构和表面雕刻与鹤科（鸡形目）近代鸟类蛋壳相似。 Dispersituberolithus 表现出一些近代新颌鸟类类群的原始或正常蛋壳状况。所描述的乌类群表明白垩纪晚期，阿尔伯塔省南部的 Devil9s Coulee 和 Knight9s Ranch 内的鸟类和兽脚亚目恐龙蛋层具有多样性。
Examination of a large number of eggshell fragments collected from the Oldman Formation of southern Alberta reveals a greater ootaxonomic diversity than is known from complete eggs or clutches. Three new oogenera and oospecies of the ornithoid-ratite morphotype and one of the ornithoid-prismatic morphotype are established, based on the eggshell fragments. Porituberoolithus warnerensis oogen. et oosp. nov. and Continuoolithus canadensis oogen. et oosp. nov. have a microstructure similar to that of elongatoolithid eggs of theropod dinosaurs. Tristraguloolithus cracioides oogen. et oosp. nov. and Dispersituberoolithus exilis oogen. et oosp. nov. possess an external zone and thus have a microstructure like modern avian eggshell. Tristraguloolithus has a shell thickness, microstructure, and surface sculpture similar to those of recent bird eggshell of the family Cracidae (order Galliformes). Dispersituberoolithus exhibits the primitive or normal eggshell condition of some recent neognathous avian taxa. The ootaxa described indicate a diversity of both avian and theropod dinosaur egg layers within Devil9s Coulee and Knight9s Ranch, southern Alberta, during the Late Cretaceous.