Concise hierarchy
	(Kingdom) Animalia - (Phylum) Chordata - (Class) Reptilia - (Order) Procellariiformes - (Family) Procellariidae
Original position
Current position
	Alternative positions
	
			Historical positions
			
				
					| Procellariidae (Family) Leach, 1820 | Ref: 
							
								E.C. Dickinson, 2003: 75. | 
					
						| Procellariinae (Subfamily) Vigors, 1825 | Ref: 
								
									B.L. Monroe Jr. & C.G. Sibley, 1993: 136. | 
						
							| Procellariidae (Family) Leach, 1820 | Ref: 
									
										C.M. Perrins, 1991 (1990): 367. | 
							
								| Procellariidae (Family) Leach, 1820 | Ref: 
										
											W.J. Bock, 1982: 971. | 
								
									| Procellariidae (Family) Leach, 1820 | Ref: 
											
												E. Mayr & G.W. Cottrell, 1979 | 
									
										| Procellariinae (Subfamily) Vigors, 1825 | Ref: 
												
													B. Grzimek et al., 1973 (1968): 572. | 
										
											| Anseres (Order) Linnaeus, 1758 | Ref: 
													
														C. a Linné, 1766: 118, 212. | 
											
												| Anseres (Order) Linnaeus, 1758 | Ref: 
														
															C. Linnaeus, 1758: 84, 131.
														 [new position] | 
											
											Number of Subtaxa