Institute of Paleontology and Geology, Mongolian Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia.
Center for Functional Anatomy and Evolution, Johns Hopkins University, Baltimore, Maryland, United States of America.
PLoS One. 2019 Apr 17;14(4):e0208480. doi: 10.1371/journal.pone.0208480. eCollection 2019.
A new genus and species of non-hadrosaurid hadrosauroid, Gobihadros mongoliensis, is described from a virtually complete and undeformed skull and postcranial skeleton, as well as extensive referred material, collected from the Baynshire Formation (Cenomanian-Santonian) of the central and eastern Gobi Desert, Mongolia. Gobihadros mongoliensis is the first non-hadrosaurid hadrosauroid from the Late Cretaceous of central Asia known from a complete, articulated skull and skeleton. The material reveals the skeletal anatomy of a proximate sister taxon to Hadrosauridae in remarkable detail. Gobihadros is similar to Bactrosaurus johnsoni and Gilmoreosaurus mongoliensis, but can be distinguished from them in several autapomorphic traits, including the maximum number (three) of functional dentary teeth per tooth position, a premaxillary oral margin with a 'double-layer morphology', and a sigmoidal dorsal outline of the ilium with a well-developed, fan-shaped posterior process. All of these characters in Gobihadros are inferred to be convergent in Hadrosauridae. Phylogenetic analysis positions Gobihadros mongoliensis as a Bactrosaurus-grade hadrosauromorph hadrosauroid. Its relationship with Maastrichtian hadrosaurids from Asia (e.g., Saurolophus angustirostris, Kerberosaurus manakini, Wulagasaurus dongi, Kundurosaurus nagornyi) are sufficiently distant to indicate that these latter taxa owe their distribution to migration from North America across Beringia, rather than having a common Asian origin with Go. mongoliensis.
一种新的栉龙类栉龙形亚目恐龙，蒙古 Gobihadros ，是根据一个几乎完整且未变形的头骨和后骨骼以及广泛的参考材料描述的，这些材料来自蒙古中东部戈壁沙漠的拜恩斯组（白垩纪-赛诺曼期）。Gobihadros mongoliensis 是已知来自中亚晚白垩世的第一个完整、关节连接的头骨和骨骼的非鸭嘴龙类栉龙形亚目恐龙。该材料详细揭示了一个接近鸭嘴龙科的骨骼解剖结构。Gobihadros 与 Bactrosaurus johnsoni 和 Gilmoreosaurus mongoliensis 相似，但在几个独特的特征上可以与它们区分开来，包括每个齿位的功能齿数量最多（三个），前上颌口腔边缘具有“双层形态”，以及髂骨的 S 形背轮廓具有发达的扇形后突。这些在 Gobihadros 中的所有特征都被推断为鸭嘴龙科的趋同进化。系统发育分析将蒙古 Gobihadros 定位为 Bactrosaurus 级栉龙形亚目栉龙形亚目恐龙。它与亚洲晚白垩世的鸭嘴龙（例如，窄吻龙、卡戎龙、王氏龙、那戈龙）的关系足够遥远，表明后者的分布归因于从北美通过白令陆桥的迁移，而不是与 Go 有共同的亚洲起源。蒙古。
