Callawayia

In this publication, he named a new species of Shastasaurus, S. neoscapularis, based on ROM (Royal Ontario Museum) 41993, a partial skeleton discovered on the shore of Williston Lake in Pink Mountain,[3] British Columbia, Canada in 1987.

[4][5] In 2000, Michael Maisch published a study on the skull anatomy of Shastasaurus, and also revised the genus again.

Knowing this, Maisch did not discuss the species in great detail, instead waiting for Nicholls' study.

Nicholls and Manabe also found the diagnosis proposed by Maisch and Matzke to be problematic, as the latter team had not examined any of the specimens firsthand, resulting in some errors and omitted information.

[3] In a 2010 publication, however, Maisch criticized the notion that the naming of Callawayia was unethical, citing that a year had been allowed to pass since he became aware of Nicholls' study, and that he came to the conclusion that Callawayia was distinct from Shastasaurus independently from Nicholls.

Ultimately, Maisch did consider the incident "unlucky" due to poor communication between the researchers while conducting their studies, though also stated that the naming was not done with malignant intent.

[7] In 2007, X. Chen and colleagues named a new species of Callawayia, C. wolonggangse, based on material from Guizhou, China.

He considered the characteristics used to differentiate G. wolonggangense unconvincing, however, and that this species was probably just a junior synonym of G. tangae.

The frontals form part of the border of the temporal fenestrae (openings on top of the skull).

[3] The short, wide humeri (upper arm bones) have notched front edges.