Assert that class recovered through runtime reflection is a subclass of another class

I am trying to call a method:

def doSomething[A <: Super : ClassTag] : B = { ... }

The method only takes a type parameter.

I have an AnyRef object and I've recovered its class at runtime. I know that the class of the object is a subclass of Super and I want to call doSomething.

Is there a way to call doSomething with the object's class as the parameter? Can I assert to the compiler that the class I recover at runtime is a subclass of Super?

I am not concerned about this failing at runtime in the case where my object is not a subclass of Super for some reason.