Hi,
this is Heiko Bleher and I just came back from the Interzoo 2008, where I had a couple of stingray displays. One from Paraguay with the real P. brachyura (only one found in the southern part of South America) and one with to rays from the Trombetas system.
I am quite sure, that the Stingray you have is a hybrid. There are so many hybrids around now and it looks like a cross between leopoldi and the pearl ray.
Anyhow, if you would have known at least if it is a wild fish, or from a breeder, that would help.
Kindest regards
Heiko Bleher
www.aquapress-bleher.com
PS: Does anyone know what is happeing with the 1st International Freshwater Stingray Symposion? As we all (invited) from Europe are not getting any answers for more than a month. Is it still on?