A. You'll probably be surprised, but the answer is – all of them! Let me explain. Although there are very strict rules (see below) for the correct way to write these names, there are no definitive rules on pronouncing them. If you attend a professional meeting of aquatic entomologists and listen to their papers, you will hear different pronunciations of the same name. So, if the experts can't agree, I wouldn't worry too much. For the examples you give, the most common pronunciations are BAY-tis, TRY-cos, and either KYRO-nomids or ky-RON-omids; seldom do you hear the first syllable pronounced CHUR.