"silver dollar" ?

[CC N]

I'm not quite sure what this is but its defenitely not a silver dollar. not a deformed or short-bodied one.

 

[A201]

I think what you have is a Metynnis type Silver Dollar. Looks like it might be a Fasciatus variant.
I've kept M. Fasciatus in the past & many were very similarly shaped w/ only very subtle differences in the fins. Be sure to keep that one, beautiful fish.

 

[CC N]

It is Metynnis fasciatus. Thank you. Those actually sold out for quite a bit for now. Those were also not as "rare" and "uncommon".
I'm really looking forward to see one of them again.

 

[CC N]

all of them have that threaded fin. Seems like the importers are really careful.