I bought this as P. sp. 'green'. Now he matured and I honestly can't see much, if any, green. It's not P. cancerides, at least not the normal form, since he looked completely different from cancerides as a juvenile. He still has a lighter carapace irl than cancerides and darker, less metallic legs.
I read an article yesterday on Theraphosidae.be that was talking about blue coloration in tarantulas. Apparently blue is among the most common coloration in tarantula genera and green is the rarest. Here's the link. It's a neat read. http://advances.sciencemag.org/content/1/10/e1500709.full