User:Ashorocetus/sandbox/Placoolithus

Placoolithus is an oogenus of fossil eggs. The first named oospecies, Placoolithus cf. taoheensis, may be synonymous with D. tumiaolingensis.

History
Placoolithus eggs were first discovered in the 1970s; they were given a provisional description in 1974. This was before the advent of modern parataxonomic nomenclature for fossil eggs, which was first used in 1975 by Chinese paleontologist Zhao Zikui. In 1979, Zhao used the name Placoolithus when he noted the similarity several eggshells from the Wangshi Group to Placoolithus, assigning them to Placoolithus cf. taohensis, despite its lack of a formal description. Almost 20 years later, in 1998, the oogenus and oospecies Placoolithus taohensis was formally described by Zhao Hong and Zhao Zikui.