Recently hundreds and thousands of fossil eggs were unearthed from the Cretaceous sequence in Tiantai Basin, Zhejiang Province, East China. The Dendroolithus dendriticus discovered from Upper Cretaceous Chichengshan Formation ( zircon U-Pb data approximately 92 Ma) was a species of the most familiar among those fossil eggs and is identified as the eggs laid by a hadrosaur based on comparisons with ones that is similar egg shell fragments and contained fossilized embryo bones from Xixia Basin, Henan Provinc, Middle China, though any hadrosaur’s skull or skeleton has not yet been found in East China so far. According to the taxonomy of hadrosaur at present, their fossil eggs should be classified in this paper. However, these three species were too far to nest, lay eggs and hatch in Tiantai Basin (of course, not rule out the possibility of their long-distance migration, though there was no evidence heretofore). So the hadrosaur laid the Dendroolithus dendriticus likely was an undiscovered species.
