Therin of Andor wrote:
"Gemworld" duology, IIRC.
Except I don't think any of the species were native, though.
It occurred to me to wonder if the Aenar would count, but they were described as a subspecies of Andorian rather than a separate species. So it's a borderline case.
I'd classify them with the Valakians and Menk, or Homo sapiens sapiens
and Neanderthals from Earth's history. They are very closely related populations and, because they are capable of producing offspring with each other (fertile offspring?), arguably aren't even separate species. The Aenar lived by themselves in cities of ice, but that seems to be more a lifestyle choice than an ecological adaptation; I can imagine the Aenar outcompeting the Andorians, not the other way around.
*Slaps forehead* Of course -- we missed the obvious example.[/QUOTE]