The taxonomy of the Procellariidae, or procellariids, is complex and still a matter of some debate.
This traditional taxonomy is based upon Carboneras (1992) in the Handbook of the Birds of the World.
Fulmarine petrels Gadfly petrels Prions Shearwaters Based on Austin (1996), Bretagnolle et al. (1998), Nunn & Stanley (1998) and Brooke (2004), several changes have been made from the more traditional taxonomy.
The two species in the genus Bulweria are no longer considered close to the rest of the gadfly petrels; several more gadfly petrels are removed from Pterodroma and placed in Pseudobulweria (allied to the shearwaters), and the Kerguelen petrel is also removed from Pterodroma and placed in the monotypic Lugensa.
Several taxa are also elevated to species status on the basis of newer studies.