Brian, I'm amazed! I've been doing a spot of research on this (as I have an interest in the Diptera from my youth), and you a are quite right! The North Western Highland Piranha Midge (
Culicoides serrasalmii subsp
caledoniae) is indeed a two-species chimera. Incredible but seemingly true. Apparently they can also be harvested by net and eaten like Whitebait but you need quite a few to make a decent meal.