期刊
JOURNAL OF SYSTEMATICS AND EVOLUTION
卷 60, 期 5, 页码 1172-1198出版社
WILEY
DOI: 10.1111/jse.12823
关键词
Aves; avian cranium; Changma locality; Early Cretaceous; Gansus; Ornithuromorpha
资金
- National Natural Science Foundation of China [41772013, 41688103]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB26000000]
- Chinese Academy of Sciences-Presidential International Fellowship Initiative Program
We described six specimens of ornithuromorph birds from the Changma locality in northwestern Gansu Province, China. These specimens provide insights into the taxonomy and dental morphology of ornithuromorph birds, and contribute to the understanding of the avifauna in this region. The observed dental variation suggests a trophic diversity similar to that found in ornithuromorphs from the Jehol Group in northeastern China.
We describe six specimens consisting of cranial remains and associated partial presacral axial series belonging to ornithuromorph birds from the Changma locality of the Lower Cretacous Xiagou Formation of northwestern Gansu Province, China. Comparison among specimens is limited by the paucity of overlapping elements, their differing exposed views, and, in some specimens, poor preservation. Despite this, three separate taxa are represented, evidenced by differences in their dentary dentitions: one specimen is edentulous, another has sharp, closely spaced, relatively high-crowned and peg-like teeth, and a third preserves blunt, relatively low-crowned teeth placed in a communal groove, a morphology previously reported among adult birds only in Hesperornithiformes. We propose that the high-crowned specimen may be referred to Gansus yumenensis based on shared similarities with the closely related Iteravis huchzermeyeri, including a very similar dentition and an edentulous premaxilla with elongate, unfused frontal processes and no palatal processes. The two other specimens are considered new taxa, for which we erect the names Meemannavis ductrix gen. et sp. nov. and Brevidentavis zhangi gen. et sp. nov. These new specimens confirm that the Changma locality is dominated by ornithuromorph birds and contribute to a better understanding of this important avifauna. The observed variation in dental morphology hints at trophic diversity like that observed in ornithuromorphs from the penecontemporaneous Jehol Group of northeastern China.
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