some of the fossil eggs housed in Warsaw. He identified them as most similar to Gobipteryx minuta, so scientists began referring to them as "Gobipteryx eggs". In 1991, the Russian paleontologist Konstantin Mikhailov introduced the modern parataxonomic system used to classify fossil eggs. While he did not give the "Gobipteryx" eggs a formal name under this classification scheme, he did assign them to the prismatic morphotype in the ornithoid basic type. He believed that they were eggs of volant paleognaths, but probably not Gobipteryx (which was then considered to be a paleognath). In the same year, the Polish paleontologist Karol Sabath reviewed the entire collection of fossil eggs discovered on the Polish expeditions, including the not-yet-named Gobioolithus eggs. Following Elżanowski, he referred them to Gobipteryx, though only tentatively because at the time ongoing studies of similar eggs found on the Soviet expeditions cast doubt on this classification. In 1994, Mikhailov, working with Sabath and Kurzanov, divided the Mongolian "Gobipteryx" eggs into two informal groups: G1, containing the smaller eggs (including the ones with embryos described by Elżanowski), and G2 for the larger eggs. Two years later, Mikhailov went on to classify these eggs parataxonomically as a new oofamily, Gobioolithidae, containing the single oogenus Gobioolithus, with two oospecies: G. minor and G. major, corresponding to G1 and G2, respectively. In 2013, Kurochkin, Chatterjee, and Mikhailov described a new genus and species of bird, Gobipipus reshetovi, based on the embryos within Gobioolithus eggs. They classified Gobipipus as an enantiornithine. In 2015, some of the larger egg specimens previously assigned to G. major were moved into their own new oogenus and oospecies, Styloolithus sabathi''. References Egg fossils Campanian life Cretaceous animals of Asia Cretaceous Mongolia Fossils of Mongolia Barun Goyot Formation Djadochta fauna Fossil parataxa described in 1996