So, what is the direct ancestor?

also, don't forget this.
Thermoregulation: Ectothermic

I have corrected the data. Its ancestor is the Thorny Hedgelog.

Coolsteph Does this replace its ancestor?

I did not intend for it to replace its ancestor. Though it overlaps with its ancestor in Drake Rocky, I figure Alpine Hedgelogs' specialization in high-altitude conditions and poorer reproductive ability where the Hopping Ketter exists would allow them to coexist.