The taxon is represented by ~16 species in a single family, the Pteroclidae. Intrafamiliar relationships are still uncertain. 

Genus-level phylogeny of extant Pteroclidae based on Cohen (2011), with the distribution of each species being indicated by the colour-code used throughout this website (Distribution code). Divergence times are largely imaginary except for the data provided by Stiller et al. (2024): Calopterocles burchelli + Syrrhaptes gutturalis / S. paradoxum.

Provisional genus-level classification of extant Pteroclidae. 

References

Cohen C (2011), The phylogenetics, taxonomy and biogeography of African arid zone terrestrial birds: the bustards (Otididae), sandgrouse (Pteroclidae), coursers (Glareolidae) and Stone Partridge (Ptilopachus), Ph.D. Dissertation, University of Cape Town. (pdf)

Soares AER, Novak BJ, Haile J, Heupink TH, Fjeldsa J, Gilbert MTP, Poinar H, Church GM, and Shapira B (2016), Complete mitochondrial genomes of living and extinct pigeons revise the timing of the columbiform radiation, BMC Evol. Biol. 16: 230. (pdf)