Dendroolithus

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Dendroolithus is an oogenus of dinosaur eggs in the family Dendroolithidae. These eggs date from the late Cretaceous period, roughly 99 to 66 million years ago. Fossils have been found in China—in the late Cenomanian Chichengshan Formation (Tiantai Group) and in the Gong-An-Zhai and Santonian Majiacun Formations—and in Mongolia—in the Maastrichtian Nemegt and Campanian Barun Goyot Formations. The eggs can reach about 162 mm in length and 130 mm in width. They were probably laid by a theropod, a sauropod, or an ornithopod.

The basic shell type is described as dinosauroid-spherulitic. The recognized oospecies include D. wangdianensis, D. dendriticus, D. fengguangcunensis, D. guoqingsiensis, D. microporosus, D. verrucarius, and D. xichuanensis. An oospecies previously assigned to Dendroolithus, D. shangtangensis, has been reclassified into its own oogenus, Similifaveoloolithus, and is associated with embryos of the theropod Torvosaurus.