One other thing comes to mind: hybrids.

Really, our fishing kayaks have morphed away from what was once a traditional kayak. SUPs would be yet another hybrid between two antecedents.

So, if you take a look, for example, at at Native Ultimate Propel, it is really much closer to a canoe than it is a kayak. As a matter of fact, I can't think of anything that would qualify it as a kayak.

Some of the Diablo kayaks are more or less hybrids between a canoe/kayak and a SUP.

And, on it goes.

Brad