It’s not selective breeding, that involves deliberate action. We chose the most mellow wolves as companions and bred them into dogs. We didn’t chose the bed bugs that were resistant to toxins, we just failed to kill them, that’s evolution.
Just unintended consequences.
We still selected the survivors.
Also the bed bugs are still bed bugs.. They aren’t on their way to being giraffes.
Different traits among the species isn’t a new species.
Humans come in a variety of hues.. pinks, browns and sallows...They are still humans.. The genetics regulate the outward appearance.
Just a different trait in the same bug.