Heishanoolithus

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Heishanoolithus is a type of fossil egg (an oogenus) from the Elongatoolithidae family, dating to the Early Cretaceous. It comes from the Shahai Formation in Liaoning, China, and is known from seven eggshell fragments. The eggshell is very thin (about 1.2–1.3 mm), with a surface covered in dense nodes and a relatively thin mammillary layer (about one eighth of the total thickness). No skeletal remains have been found with these eggs, but Elongatoolithid eggs are strongly linked to oviraptorosaurs. The type species is Heishanoolithus changii.