I know that this might be controversial; after all, people generally either don’t think flies have any redeeming qualities (never mind “beauty”), or more likely for readers of this blog, have their own ideas of what constitutes a gorgeous fly.
I submit, however, that this amazing silver male stratiomyid (soldier fly) from Costa Rica is the most beautiful fly in the world. It moves around on the underforest leaves like an animated drop of quicksilver, flashing in the tropical sun. It is not garish, like some of the gaudy calyptrates I have seen (see below), but has a pure beauty in its clean, sleek metallic cover. Just in case you find this boring, it also has a scutellum decorated with spines, like the crown of royalty.
The name of this creature is Artemita aurata (Macquart), and it was described in 1846, so it is not anything new, but it deserves “rediscovery” by lovers of biodiversity everywhere.
Don’t agree with me? Let’s hear your nominations!