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A new oogenus and oospecies, Umbellaoolithus xiuningensis oogen. et oosp. nov., is described on the basisof specimens from the Upper Cretaceous Huizhou Formation in the Huangshanarea of Anhui Province, China. The Mesozoic strata developed in SouthAnhui, producing a large number of dinosaur skeletons, dinosaur eggs,dinosaur footprints and so on. The Xiuning Basin is a small intermountainbasin during the Mesozoic. The Triassic strata are scattered and theJurassic and Cretaceous strata are intact in the basin. The Jurassicstrata include the lower Jurassic Yuetan Formation, and Middle JurassicHongqin Formation. The Cretaceous strata include the lower CretaceousBingqiu Formation, Shiling Formation and Yantang Formation, UpperCretaceous Huizhou Formation, Qiyunshan Formation and Xiaoyan Formation.The materials we studied were found in the Huizhou Formation of Qiyunshan,Xiuning, in 2011. There is an incomplete egg nest consisting of atleast 9 dinosaur eggs. The eggs are oval, arranged along the longaxis of all the eggs parallel to each other, and not at the same horizontallevel within the clutch, obviously differing from the elongated eggs,paired, regular arrangement and radial orientation seen in clutchesattributable to the Elongatoolithidae and Macroelongatoolithidae.The eggs of Umbellaoolithus xiuningensis also differin typical alignment from those of the Prismatoolithidae, which arevertical or near vertical. The average diameter of the eggs is 13.86 cm,the equatorial diameter is 10.43 cm, and the shape index is75.25. In general, the eggshell units have the shape of an umbrella,triangle or cone, and are arranged irregularly, unlike in the Spheroolithidae,Stalicoolithidae and Ovaloolithidae. The cones are hemispherical inshape. The cone layer is very thin, its average thickness of 0.12 mmrepresenting approximately 1/6 of the total eggshell thickness. Umbrella-likeeggshell units are well-developed near the inner and outer surfacesof the columnar layer. The eggshells have numerous irregular pores,unlike in several oofamilies including the Dictyoolithidae and Faveoolithidae.Consequently, we established a new oofamily: Umbellaoolithidae oofam.nov.. This new specimen unambiguously represents a distinct oospeciesof dinosaur eggs in southern Anhui, and provides new paleontologicalevidence bearing on the classification and correlation of Upper Cretaceousstrata in southern Anhui.

New oospecies of dinosaur eggs from the Upper Cretaceous of South Anhui