The Early Cretaceous fossil conchostracans are collected from the Bayingebi Formation of Huluntaolegai, Bagemaode in the Inggen-Ejin Qi Basin, weastern Inner Mongolia. The conchostracan fauna consists of Diestheria jiayuguanensis Shen and Chen, in Shen et al., 1982, Yumenestheria delicatula Shen and Chen, in Shen et al., 1982. These two species are common in the Chijinpu Formation of the Hexi Corridor, Gansu. This indicates a correlative relationship between these two formations, and both of them are of Jiufotangian age.

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