The 8th Creature (that giant fiery purple thing) is the Garugopteryx, which is based on a creature from Monster hunter, more specifically Yian Garuga. For more information, here's the link to the Ark: Additions wiki's Garugopteryx page: https://ark.fandom.com/wiki/Mod:ARK_Additions/Garugopteryx

Although there's barely any information on the wiki about the Garugopteryx since... It's not out yet.