I am not saying there is ONE snake that is THE example. I just think that if the the question is asked and people answer honestly, over time a data set can be collected and consensus on a series of traits may be able to be ascertained. For many the data may wind up not statistically significant, but I really do not think that would be the case for all morphs.
That is also why I asked for folks to explain why they think the morph is a good example (or a bad one). Just putting up a pic is cool but really does not verbalize what one is looking for.
You keep asking who sets the standard, and my answer is that we all as a group set them.