Austrodyptornithes is a clade of birds that include the orders Sphenisciformes (penguins) and Procellariiformes (tube-nosed seabirds).

[2] A 2014 analysis of whole genomes of 48 representative bird species concluded that penguins are the sister group of Procellariiformes,[3] from which they diverged about 60 million years ago.

[4] Spheniscidae (penguins) Diomedeidae (albatrosses) Oceanitidae (Austral or southern storm petrels) Hydrobatidae (northern storm petrels) Pelecanoididae (diving petrels) Procellariidae (fulmarine petrels, gadfly petrels, prions, shearwaters)

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