Is Neuquensaurus a valid name, and if so what year gets attribution?
Powell 1992 doesn't indicate a type species or a new combination so it fails the ICZN requirements for a valid replacement genus for pre-1999 names, and Powell 2003 lacks an indication it is a new name (attributes it to Powell 1992). Unless Powell's thesis qualifies as a publication (went through an editorial process before being released as print-on-demand) I think Neuquensaurus might be a nomen nudum, which is really unfortunate because its a good taxon.