Let's start by saying that these fish are definitely not easy to identify. And from what I understand, Norman Behr is to Loricariinae what Ingo is to the Pleco group. So if he says it's X, then I would think that is the nearest you'll get. I may be wrong...
These are the species that fishbase list as from Argentina (note that not all are certain to occur in Argentina):
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Rineloricaria catamarcensis native
Rineloricaria felipponei native
Rineloricaria isaaci native
Rineloricaria lima native
Rineloricaria microlepidogaster native
Rineloricaria misionera native
Rineloricaria pareiacantha questionable
Rineloricaria parva native
Rineloricaria phoxocephala questionable
Rineloricaria thrissoceps questionable
But there are, I think, nearly as many Rineloricaria as there are Ancistrus. They just haven't been all sorted out yet (oh, and some are listed in the Cat-eLog as Hemiloricaria instead of Rineloricaria.
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Mats