Children (9 direct children, 97 direct and indirect children):
Fregetta
(tree size 11)
Oceanodroma
(tree size 30)
Oceanitinae
(tree size 4)
Hydrobatinae
(tree size 2)
Garrodia
Hydrobates
(tree size 21)
European storm-petrel
Pelagodroma
(tree size 7)
White-faced storm-petrel
Thalassidroma
(tree size 8)
Cymochorea
(tree size 5)