hard belleid silver dollars

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Barbs, silver dollars...they all fit well in south american-type water.
 
What's a "hard bellied silver dollar" and how does it differ from the typical silver dollar, Metynnis hypsauchen? Is it Tetragonopterus argenteus, perhaps?
 
icthyophile said:
What's a "hard bellied silver dollar" Is it Tetragonopterus argenteus, perhaps?

The hard bellied are Mylossoma duriventre
 
I think they are called "hardbellied" because they have a narrow keel ridge of slightly over sized scales.
 
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