APODIFORMES Peters, 1940 (1867) This name has a complicated history. Priority would seem to indicate that Trochiliformes should be used as it dates back to Wagler ... http://jboyd.net/Taxo/List6.html
In this list of birds by common name, a total of 9,721 extant and recently extinct bird species are recognised, belonging to a total 204 families. https://en.wikipedia.org/wiki/List_of_birds_by_common_name