[1] In 2015, Varracchio and Barta redefined G. major, and reclassified the "larger avian eggs" into an entirely new oogenus, Styloolithus.

The type specimen of Styloolithus is a fossil clutch of at least four eggs and associated adult remains (probably representing the parent).

However, the eggs themselves are quite different from Troodontids, and the associated skeletal remains are similar to the enantiornithine Gobipteryx minuta (=Nanantius valifanovi).

It can be distinguished from all non-avian dinosaur eggs by the thick third layer of the shell (possibly representing an external zone).

However, it is most likely avian because it has an unornamented, thin shell that probably has three structural layers, a combination of characters unique to bird eggs.