User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-7584137-20150319165012/@comment-6050823-20150320000142

Molten Tigrex possibly might be though its hard to say. We do know the ancestor of Tigrex and all Flying Wyverns was Wyvern Rex. An interesting note is that its said that Brute Tigrex may actually be the same species as Tigrex due to the Tigrex's nomadic behavior while Molten Tigrex is said to be a Subspecies of Tigrex.