The Early Cretaceous non-Cypridea Ostracoda from Yixian and Jiufotang formations of western Liaoning (China)

Abstract

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, Lycopterocypris infantilis, Lycopterocypris debilis, Damonella circulata, Ziziphocypris linchengensis, Ziziphocypris costata, Ziziphocypris simakovi, Timiriasevia jianshangouensis, Timiriasevia corcava, Alicenula leguminella, and Alicenula sp. Of these, six species are with emended descriptions. All of the non-Cypridea species described in this paper are endemic to in eastern Asia, except for Rhinocypris jurassica and Alicenula leguminella, which have worldwide distributions and long stratigraphic ranges.