They are simply new strains of species we have and know about here on earth already. They are not new species.
You could think of them like strains of the flu (which is a virus, but the comparison works). It’s still the flu, but has a few new qualities that differ slightly from the original. This is why we have new flu shots every year.
Ehm to explain simply they just evolved from our normal bacteria here on earth
kind of like how humans evolved from “monkey like” creature but since bacteria reproduces in minutes or hours rather than years like us, their adaptation time is really short so they are no longer the original bacteria but a new breed to be short
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