Since you “teach this stuff” I would hope that you are aware that that definition is full of holes and grey areas. Some species can produce fertile female offspring but sterile male offspring.
Are you saying there is a situation where a species has no fertile males?
There are many (esp. insects) with infrequent fertile males. I would not be surprised if there were instances where the fertile males had not yet been observed, but I can’t think offhand of a diploid species definitively shown to have none, ever.