"Hironosaurus" Hisa 1988
"Godzillasurus" Ikejiri 2003
"Amphicoelicaudia" Cheng et al 1994
I can't find any references that match - does any one the full citations
for:
Hisa 1988
Ikejiri 2003
Cheng at al 1994
I know this won't help (I don't know the references either), but the three
names you mention are all "nomina nuda". In other words, they are not valid
names, but the nomenclatural equivalents of nicknames. Until a dinosaur is
officially named, these nomina nuda have the potential to be mistaken for
real names (and can sometimes cause problems for this reason).
BTW, I think the dinosaur nicknamed "Amphicoelicaudia" went on to be
officially named _Huabeisaurus_. It's a sauropod.