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In this study, we restudied a rarely known oospecies from China,  Stromatoolithus pinglingensis . Original materials from type locality Nanxiong, Guangdong Province as well as recently recovered materials from Shanyang, Shaanxi Province and Laiyang, Shandong Province are compared in this study. After detailed study about general and micro-structure of these eggshells, we are sure that this ootaxon cannot be placed within Spheroolithidae or any other oofamilies, though new oofamily cannot be erected due to lack of complete specimen. In the meantime, we reviewed some Spheroolithidae eggs from Asia, North America, and Europe. We propose that the Mongolia oospecies  Spheroolithus maiasauroides  is a synonym of  Stromatoolithus pinglingensis . Eggs of  Maiasaura, Spheroolithus albertensis  from North America and  Spheroolithus europaeus  from Spain should be reassigned to  Stromatoolithus . The Lower Cretaceous oospecies  Guegoolithus turolensis  from Spain should also be considered as ootaxon with close relationship to  Stromatoolithus  but not Spheroolithidae. The geographic distribution of Spheroolithidae may not be so wide as former researchers thought, and the producer of Spheroolithidae is back to unknown. The oogenus  Stromatoolithus  is associated with hadrosaurs, and may restrict to Hadrosauridae.

Restudy of the original and new materials of Stromatoolithus pinglingensis and discussion on some Spheroolithidae eggs