Get class that is being refined from the refinement

Consider the following sealed trait:

sealed trait Type

object Type {
    case object S
}

sealed trait Test{
    type Tpe <: Type
}

object Test {
    type Aux[T <: Type] = Test{ type Tpe = T }
}

Given a ClassSymbol denoting Test.Aux[S.type] is there a way to get a ClassSymbol denoting sealed trait Test?