[1] The sole known Parvoblongoolithus jinguoensis specimen was found in the Upper Cretaceous Chichengshan Formation in Tiantai County, Zhejiang.

However, its microstructure suggests it was laid by some kind of non-avian dinosaur, related to the parents of Stalicoolithidae, Paraspheroolithus, or Mosaicoolithus.

This would have made it much more difficult for a baby dinosaur to break out of the egg without parental assistance.

It is possible that Parvoblongoolithus actually represents a fossil dwarf egg, a type of deformity occasionally observed in modern birds when a disturbance of the oviducts causes them to form a small, deformed egg.

The eggshell resembles the spherulitic type, but it lacks the radial-tabular ultrastructure.