The first discovery of fossil Orthoptera in the Jiuquan Basin and its palaeogeographic significance

Publication Type:Conference Paper
Year of Publication:2016
Authors:Wang, H, ZHENG, DARAN, Hou, X, Lei, X, Zhang, Q, WANG, BO, Fang, Y, Jarzembowski, EA, Zhang, H
Conference Name:The 7th International Conference on Fossil Insects, Arthropods and Amber
Date Published:26/04/2016
Publisher:Siri Scientific Press
Conference Location:National Museum of Scotland, Edinburgh

In the Jiuquan Basin of Gansu Province, northwestern China, the Lower Cretaceous Xinminpu (Xinminbao) Group consists of the Chijinpu (Chijinbao), the Xiagou and the Zhonggou formations in ascending order. Abundant insect fossils have been discovered in these strata since 1947 when the giant mayfly Ephemeropsis trisetalis Eichwald was discovered in the Jiuquan Basin. Typical components of the Jehol Biota have been reported from this basin, including Coptoclava longipoda, E. trisetalis and Lycoptera. Although these strata have been studied for a long time, their age is still in dispute. Recently, we found a fossil Orthoptera, Parahagla sibirica Sharov, 1968, from the Chjinbao Formation in the Jiuquan Basin, representing the first discovery of fossil Orthoptera from this locality. The diagnosis of the species has been revised based on the new specimen. To date, more than ten specimens assigned to P. sibirica have been found in the Lower Cretaceous of Siberia and North China, based on which we discuss its palaeogeographic and stratigraphic distributions. Two possible migration paths of the species are indicated as follows: (1) This species initially appeared in northern Hebei and western Liaoning, China at latest in the earliest Aptian, and further migrated northwestwards to Transbaikalia and westwards to Gansu Province soon after (early–middle Aptian). (2) Alternatively, it originally occurred in Transbaikalia earlier than the Aptian and further migrated southwards to northern China during the Aptian.

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