heres Brent's humerosa.. dots around the disc margin, tail pattern kind of similar? the patterns are a bit different..
I'm probably way off base just an observation..
that ray on the Video from Ivan looks like Orbignyi to me.
And the ray of Brent is in my Opinion an "Dumerilli" too, there u can why I think these are Schroeder/Orbignyi crosses.
The pattern is different to mine because mine is only 8inches.
And u can´t tell exactly on the pattern, because many Dumerilli look different, like hybrids do