分类： 生物学 >> 动物学 提交时间： 2022-01-19 合作期刊: 《古脊椎动物学报》
摘要： Moganopterus zhuiana L�et al. 2012 was erected as a member of the Boreopteridae, which was questioned by different researchers shortly after the publication. Although the new assignment to the Ctenochasmatidae is widely accepted by pterosaur researchers, some characteristics still require a detailed description. Here, the holotype of this taxon is restudied, and some ambiguous characteristics are re-identified. The diagnosis of this taxon has been revised as the following: a large ctenochasmatid pterosaur, which can be distinguished from other members of this clade by a single autapomorphy: an elongated rod-like parietal crest that extends posterodorsally, forming an angle of about 15�with the ventral margin of the skull. This taxon can be further distinguished from other ctenochasmatids on the basis of the following combination of characteristics: straight occlusal surfaces of the upper and low jaws; presence of a low premaxillary crest confined anterior to the nasoantorbital fenestra; rostrum about two thirds of the skull length; nasoantorbital fenestra occupying slightly more than 20% of the skull length; about 100 slender teeth; and a mid-cervical length/width ratio of about 7. The wingspan of M. zhuiana has been re-estimated according to a simple regression equation for wingspan versus skull length in ctenochasmatids. It confirms that M. zhuiana, although smaller than previous thought, is still the largest known ctenochasmatid. When comparing the sizes of ctenochasmatids in the Jurassic and Cretaceous, ctenochasmatids showed a rough tendency to increase their sizes.
分类： 生物学 >> 动物学 提交时间： 2025-02-14 合作期刊: 《古脊椎动物学报》
ZHU Xu-Feng
CHANG Fei
LI Yu
ZHANG Xu-Huang
GAO Dian-Song
WANG Qiang
QIU Rui1 WANG Xiao-Lin
LIU Di
JIA Song-Hai
JIA Guang-Hui
ZHANG Jian-Hua
XU Li
摘要： 豫西潭头盆地上白垩统中已发现了多种脊椎动物化石，以数种非鸟恐龙类的发现 为特点。盆地内也同时报道有大量的蛋壳，然而关于这些蛋壳的研究却还不足。新材料 41HⅤ0199为2021年发掘自潭头盆地上白垩统秋扒组。岩石中保存了8枚完整蛋体，组成一 不到一半的部分蛋窝，此外还保存有若干分散于围岩中的破碎蛋壳，其凹面向上与凹面向 下者的比例为54.5∶45.5, 指示这些蛋壳可能直接来源于该蛋窝，且蛋窝在埋藏前发生了部 分破碎。基于宏观形态与显微结构的特征，这些蛋和蛋壳可被归入长形蛋科的瑶屯巨形 蛋(Macroolithus yaotunensis)。该蛋种已知与窃蛋龙类直接相关，而盆地内发现的迷你豫龙 (Yulong mini) 可能是该蛋窝的产蛋者。此外，在个别蛋壳中还发现了指示蛋体滞留的显微 结构，这是此类病态结构在长形蛋科中的第二例发现。
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