Is it Gibbus or Rhombues

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can't see picture, but there is no way to tell if its a gibbus unless you know the location that it came from.

unless you knew it was from Rio Araguaia then it is not a gibbus.

A lot of people consider gibbus to just be a sub speicies of rhoms but if it is a real species,

If it comes from Rio Araguaia, has red eyes, has yellow gill plate, and more elongated than a rhom then it is a gibbus.
 
got what i ID'd as a gibbus once for a friend. It came in the same shipment with similar sized rhom. eyes were clear, body longer than normal serras but shorter and more angular than elong. cant see your photo.
 
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