Hi (again and again) Giabralter,
In the "Rare Griffin Family Members" section of the Heliodromus page you are referring to hieracospinx and criospinx. I gave a look into The Element Encyclopedia of Magical Creatures by John and Caitlin Matthews and they are referred to as hieracosphinx and criosphinx.
Is it a mistake on your side or a forecasted change?