This year I made ivories and pumas from my orangebelly female by breeding her to a puma male. I got the female from Ben, and she is a graphite sired sibling of a paradox ivory. Orangebellies are just a variant of the yellowbelly, maybe a slightly darker and more orange version, judging by looking at my female. They may have something "extra" going on in that more than one graphite has been produced from this line, but I don't think we understand yet how to make the graphite. I noticed that my ivories had more color than the ivories I made from the regular yellowbellies. They had faint purple and orange tones on their backs and I emailed Ben to ask about that. He noticed that phenomenon too, but said that those ivories turn white just like other ivories in time. (I think he used to call them ultraivories at one time, but abandoned that name since they didn't turn out to be different.)
The pumas I made from the orangebelly seem a little more orange than the other pumas. I think that is just an example of selective breeding since mom is darker and more orange than my other yellowbellies.