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Well, if none of them has been reported in Sardinia, the situation is a lot trickier ;)

There are some European species that I have never seen or been able to study :( Give me a couple of days to study the situation, please. One thing is certain: I have seen polyphemus in real life and this one fits rather nicely, although I cannot get a real idea of its size. T. polyphemus is usually a really bulky fly compared to common species as perspicillaris or elegans. But size variation is important in most Anthracinae :( (at least here in Spain) and can be deceiving.

See a picture of T. polyphemus in Spain. On flowers of Eryngium campestre. That will give you an idea and a reference to compare :) while you wait... ;)