| 论文摘要 |
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. |
