Please read the information I posted and linked.
It is not the color of the salamanders but their inability to interbreed at the ends of the ring!
That is the definition of a species.
Biologists have *two* mutually exclusive definitions of speciations: any change or the inability to cross-breed.
As for inability, there is a grand difference between lack of desire from that of lack of capability.
That the same salamander “can’t” breed with the same salamander but of a different color is preposterous. That one color salamander wouldn’t *want* to breed with the same species in a different color is far more plausible.
Some white guys don’t fancy black girls. No big deal. But they *could* breed with black girls. Big difference between “don’t want to” from that of “can’t do it physically.”