John E. D'Angelo

It needs to be made clearer what is a new hypothesis in this paper and what ideas have been previously suggested in the literature. For example, you call Notocolossus and Dreadnoug...

_Alamosaurus sanjuanensis_ is a valid taxon according to D'Emic et al. (2011), who establish a combination of three characters uniting the type specimen with the more complete USNM...

One minor other concern I did not address in my previous comment: the manuscript is unclear about whether there are any new observations of the fossils beyond those based on the fi...