The First Dictyoolithus Egg Clutches from the Lishui Basin, Zhejiang Province, China
The First Dictyoolithus Egg Clutches from the Lishui Basin, Zhejiang Province, China
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DOI：
10.1080/02724630903409279
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Xingsheng Jin;Frankie D. Jackson;D. Varricchio;Yoichi Azuma;Tao He
中科院分区：
文献类型：
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作者：
Xingsheng Jin;Frankie D. Jackson;D. Varricchio;Yoichi Azuma;Tao He
浙江丽水盆地上白垩统赤城山组地层中发现了三个窝和八个卵。三窝卵中有6-18个部分或完整的球形卵，直径14-18厘米。蛋壳厚度和网状孔隙系统与Dictyoolithus hongpoensis Zhao，1994相同。然而，蛋壳缺乏叠加壳单位先前报道在这个oospecies。显微结构的差异很可能是由于原始研究中依赖于薄片分析;此外，由于没有扫描电子显微镜（SEM）或SEM成像的低放大倍数（×45），所有网石藻卵种中的叠加壳单位没有得到充分记录。支序分析和存在的下列字符支持兽脚类动物的亲缘关系Dictyoolithus hongpoensis：相对狭窄的间距的核网站，乳头状锥块状方解石裂解，棱柱柱，和平行的薄层内的壳单元。我们重新评估以前的分配Dictyoolithus蛋恐龙-球晶基本型和主张停止基本型和形态型的化石蛋分类。
ABSTRACT Three clutches and eight additional eggs are described from the Upper Cretaceous Chichengshan Formation in the Lishui Basin of Zhejiang Province, China. The three clutches contain 6–18 partial or complete spherical eggs, 14–18 cm in diameter. The eggshell thickness and reticulate pore system are identical to Dictyoolithus hongpoensis Zhao, 1994. However, the eggshell lacks superimposed shell units previously reported in this oospecies. The difference in microstructure most likely results from the reliance on thin section analysis in the original study; furthermore, superimposed shell units are inadequately documented in all Dictyoolithus oospecies due to the absence of scanning electron microscopy (SEM) or low (×45) magnification of SEM imaging. Cladistic analysis and the presence of the following characters support a theropod affinity of Dictyoolithus hongpoensis: relatively narrow spacing of nucleation sites, mammillary cones with blocky calcite cleavage, prismatic columns, and parallel laminae within the shell units. We reevaluate previous assignment of Dictyoolithus eggs to the Dinosauroid-spherulitic Basic Type and advocate discontinuation of Basic Type and Morphotype in fossil egg classification.