Re: I love a good virus painting
These are modelisations of the receptors, in ribbon (as opposed to space-filling) representation. It's just the (probable) conformation of the proteins involved, and a bit esoteric (especially in ribbon form), albeit usefull.
To be honest the claim of "speciation" here is a bit far-stretched, but the term has always been quite loosely defined in microbiology (and especially virology). The usual consensus is that the concept of species doesn't apply to virions. But it is undoubtedly adaptation, you could label it evolution even, so I'll allow it this time ;-)