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Based on newly collected material from the Lower Cretaceous Yixian and Jiufotang formations, twenty-one ostracod species belonging to 12 genera are described, including: Yumenia? acutiuscula, Yumenia? sp., Scabriculocypris pingquanensis, Limnocypridea grammi, Candona praevara, Candona sp., Cheilocypridea trapezoidea, Rhinocypris jurassica, Rhinocypris tugurigensis, Rhinocypris sp., Djungarica camarata,...