Is it feasible for one subspecies to have a tail and the other, not to?

Let's say I have a species similar to human, as sort of New Humanity. The only thing that separates them from humanity is their subspecies: the Sublorans. They have multiple animalistic features that separate them from the other subspecies. Most of the features that separate them are easily explained except for one: tails. As far as I am aware, there exists no species where one subspecies has a tail and another does not. Could a subspecies with this biological trait exist while the other lacks it? What evolution would support it? If so, how could it?

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Is it feasible for one subspecies to have a tail and the other, not to?

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