ID this pair Falkeri or castexi?

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I think the one in the second pic at the bottom is a Falkeri but the one above looks like a very beautiful castexi with a very fine pattern. I think it's the fact that the castexi/flankeri doesn't have the clear spotted pattern as the one below it.
Here is Frank's site http://www.freshwaterstingray.nl/Frames Engels/English.html

Alex
 
I think the one i though was a Falkeri is a Potamotrygon Signata P41. If you have the Aqualog on freshwater stingrays Richard Ross book (the holy grail of ray books) look at
pg 123 the pic in the top right looks like your ray. and on Pg147 on the bottom left there is P.Signata P41 that also looks like your ray.

Whatever they are they are great looking fish, i wish you all the best with them, and hope they breed soon.
 
Frank at first thought they were falkeri but thinks from books there castexi. i have alot of castexi and there eyes and head shape are alot different. But one i got from TFD as falkeri and i would imagine i got taken for another ride by them.
 
Alex.P;856309; said:
I think the one i though was a Falkeri is a Potamotrygon Signata P41. If you have the Aqualog on freshwater stingrays Richard Ross book (the holy grail of ray books) look at
pg 123 the pic in the top right looks like your ray. and on Pg147 on the bottom left there is P.Signata P41 that also looks like your ray.

Whatever they are they are great looking fish, i wish you all the best with them, and hope they breed soon.

dont have book with me now what say on page 123 what type ray? I have seen quite few different types of falkeri very hard to say.
 
It says that its trade name is R 108 it's a P Signata and it comes from Lower Rio Araguaia (Tocantis Brazil)
 
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