User blog comment:Aandrew07/Discussion of the Week: Subspecies/@comment-1773866-20121023012615/@comment-4212769-20121024213234

To give you a better example (from the one you gave me):

Blango A (Proto-Blango/living in the Snowy Mountains) evolved to Blango B (Copper Blango) but while this progress was there Blango A also evolved to Blango AA (Common Blango) and Blango AA outcompeted Blango A over time so Blango A got extinct. Blango AA isn't the same that evolved to Blango B. With that two subspecies can be distinguished.

When Blango A lives somewhere else it also could just go extinct, outcompeted by other animals/monsters that fill its niche/preyed upon it or evolve a different subspecies. In this case Blango B would be the Snowy Mountain subspecies (as it is the Common Blango) but the Desert one would be Blango C.

You can put each other monster with subspecies in these scenarios. That's the way subspecies evolve, of course quite simplified.