most people would only consider species as "real" (remember that a genus is just another clade)
Under some species concepts, species are necessarily clades, too.As I always say: as of February 2008, there are 147 species concepts out there; depending on the species concept, there are from 101 to 249 endemic bird species in Mexico; there's nothing all species concepts have in common except the _word_ "species".
To measure biodiversity, use the Phylogenetic Diversity Index (Faith 1992, 1994).