Blue-crowned motmot is Momotus momota. The only other species of the genus is Momotus mexicanus, It obviously don't exist such a thing as "Momotus aequatorialis" and other nonsenses. I expected this kind of reply when I posted the motmot photo in the morning. But red is red, a plum is a plum, and the sun is the sun. And Momotus momota is Momotus momota. I'm not who for contradict the whole science and the whole world, unlike you and most zoochatters like to do.
Species in the genus Himantopus are H. himantopus, H. leucocephalus, H. mexicanus, H. melanurus and H. novaezelandiae, this just from memory so maybe I skipe one more that I don't remember. Years ago I've heard some rumours about the lumping of all species in H. himantopus but this is rarely followed, used or accepted by nobody.
He wasn't arguing the taxonomy with you on this one. The species held in the USA is usually signed as the wrong species entirely. The same as many zoos here having "mountain coati", a real species that is not present in the USA; they are usually South American coati (sometimes white-nosed), given the improper name and signage.