In fact, by analyzing electrophoritic separations of selected enzymes and studying DNA patterns, the two subspecies klauberi and eschscholtzi are different species by every definition. (Wake, Yanev and Brown, 1986) This poses a very interesting problem. Should the species Ensatina eschscholtzi be split into two or more species, or be considered a single species? If the species is to be split, where does one draw the line?The point of my "Where is the barrier?" question to Aquinasfan many pages back. There is no barrier.
Exactly. I tried to explain that some time ago but the idea that there must be a barrier is an artifact of our method of categorizing things thus it isn't easy to root out.
I used the analogy with the visible spectrum where we too use categorizations (red, yellow, green, blue) but there isn't a barrier between red, yellow, green, or blue either, it's just a continuum.