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The classic definition of a subspecies (race) versus a true species is that a true species can't interbreed with another and produce fertile offspring whereas different races of one species can do so.

In the past, hybridization was actually used as a test to see if one specimen was in fact the same species as another.

I would argue that in the case of many tarantulas, they are races not true species. The genus level as defined today is probably the actual species in the classical sense of the word.

Of course, in all these cases, yes even us, the races should be preserved. In terms of humans, redheads are most at risk of vanishing, a fate to horrifying to contemplate.

Of course, the Chinese will probably take over the world in 30 years anyway...

... especially if you think that racial purity and a higher IQ are an advantage.  By that measure, we're screwed.

Hopefully Trump can slow down the decline for another decade or so and get that wall up. I voted for him once and will do so again and that's about as political as I'll get, at least in this forum.

The question remains. Are the hybrids fertile with each other? That's the test.