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However, it is generally agreed amongst evos that if two disparate sexual groups are able to interbreed as a matter of course, and their offspring can also breed, then the two groups are of the same species.

No, that's a very confused statement.

Of course individuals that routinely breed are of the same species, but there are populations that are genetically capable of producing fertile offspring that seldom or never interbreed. You are asking questions that imply the word species somehow determines reality. Species is just a word with fuzzy edges. Darwin called species a strong variety. He also used the term race interchangeably with species. They're just words.

Actually, it is very clear. Reread it. It appears to me that either you don't understand what the statement "as a matter of course" means or you missed it in your reading of my post.

That said, I reiterate that I'm not trying to start a flamefest here. I'm just pointing out that amongst evos, speciation is often a matter of opinion that has nothing to do with the ability to crossbreed. The article implied that different species of humanoids interbred routinely. According to your own statement, this means that these humanoids were not of different species.