In 2007, X. Chen and colleagues named a new species of Callawayia, C. wolonggangse, based on material from Guizhou, China. In 2010, Maisch moved this species to Guizhouichthyosaurus, as G. wolonggangense, noting that it was distinctly different from Callawayia. He considered the characteristics used to differentiate G. wolonggangense unconvincing, however, and that this species was probably just a junior synonym of G. tangae. He still maintained it as provisionally valid though, as detailed investigation had not yet been done.
