Petrels are tube-nosed seabirds. The are in the order Procellariiformes (tubenoses seabirds including petrels, albatrosses and others). There are four families:
Procellariidae fulmarine petrels, gadfly petrels, shearwaters . The genera are:
Macronectes
Southern Giant Petrel Macronectes giganteus
Northern Giant Petrel
Macronectes halli
Fulmarus Northern and Southern Fulmar (see Fulmars)
Thalassoica Antarctic Petrel
Daption
Cape Petrel, Cape Pigeon Daption capense
Pagodroma Snow Petral
Halobaena Blue Petrel prion
Pachyptila prions (see prions)
Procellaria Grey Petrel, Procellaria cinerea,
White-chinned Petrel, Procellaria aequincotialis,
Spectacled Petrel, Procellaria consicillata,
Black Petrel, or Parkinson's Petrel, Procellaria parkinsoni,
Westland Petrel, Procellaria westlandica,
Bulweria
Calonectris 3 large shearwaters
Puffinus see shearwaters
Pseudobulweria
Fiji Petrel, Pseudobulweria macgillivrayi
Tahiti Petrel, Pseudobulweria rostrata
Beck's Petrel, Pseudobulweria becki
Mascarene Petrel, Pseudobulweria aterrima
Lugensa
Pterodroma
Diomedeidae large seabirds Albatrosses
Pelecanoididae diving petrals

Hydrobatidae Storm Petrals, the smallest of the seabirds . The subfamilies, genera and species in the Hydrobatidae family are listed below.
Wilson's Storm-petrel Oceanites oceanicus
New Zealand Storm-petrel Oceanites maorianus
White-vented Storm-petrel Oceanites gracilis
Grey-backed Storm-petrel Garrodia nereis
White-faced Storm-petrel Pelagodroma marina
Black-bellied Storm-petrel,Gould's Storm-Petrel Fregetta tropica
White-bellied Storm-petrel Fregetta grallaria
Polynesian Storm-petrel Nesofregetta fuliginosa
European Storm-petrel Hydrobates pelagicus
Leach's Storm-petrel Oceanodroma leucorhoa
Matsudaira's Storm-petrel Oceanodroma matsudairae
Least Storm-petrel Oceanodroma microsoma
Wedge-rumped Storm-petrel Oceanodroma tethys
Madeiran Storm-petrel Oceanodroma castro
Monteiro's Storm-petrel Oceanodroma monteiroi
Swinhoe's Storm-petrel Oceanodroma monorhis
Guadalupe Storm-petrel Oceanodroma macrodactyla
Tristram's Storm-petrel Oceanodroma tristrami
Markham's Storm-petrel Oceanodroma markhami
Black Storm-petrel Oceanodroma melania
Ashy Storm-petrel Oceanodroma homochroa
Hornby's Storm-petrel Oceanodroma hornbyi
Fork-tailed Storm-petrel Oceanodroma furcata