So here's the idea, ~35 million years ago Antarctica was still quite habitable. This is far to early for hominids but what if a humanoid species arose in South America and migrated south into Antarctica? What kind of ancestor could work? They would have the look roughly human but don't have to look identical. But from a simple description be mistaken for a human, so no tails but a face like a bonobo could certainly work.
My first idea was take a common ancestor from the capucin monkeys and drag them through the aquatic ape hypothesis but there's no way to make that timeline work before climate change freezes over the continent. The goal is them having reach something akin to the bronze age at 35 million years ago, ideally the Antarctic coastline is still tropical.
So I'm looking for a probable ancestor for my humanoids and what vestigial traits that would force me to incorporate.
So our requirements are this:
Humanoid in appearance Hands complex enough for tool manufactering
Color vision but doesn't need to be identical to humans but something relatively close
Human level intelligence in time to reach the late bronze age before Antarctica becomes to cold to occupy the inland area.
Ability to live all over the continent, from the swampy coasts to the dry inland near the pole.
Evolved in a place so it crossed into Antarctica from South America, this can technically be from Africa and came during along with the ancestors of the New World Monkeys e.g.