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2*procellariidae**†"argyrodyptes" (san julián late eocene/early oligocene of chubut, argentina)**†"pterodromoides"**extant genera present in the fossil record***"puffinus" (early oligocene - recent) - includes ""larus" raemdonckii"***"fulmarus" (middle miocene - recent)***"pachyptila" (late miocene - recent)***"calonectris" (early pliocene - recent)***"pterodroma" (pleistocene - recent)***"procellaria"*pelecanoididae**extant genera present in the fossil record***"pelecanoides" (early/middle miocene - recent)===gaviiformes===*gaviidae**†"colymboides" (late eocene - early miocene) - includes "hydrornis"**extant genera present in the fossil record***"gavia" (early miocene - recent)===sphenisciformes===*unresolved and basal forms**†"waimanu" (early - late palaeocene)**†"perudyptes" - basal?
2*procellariidae – petrels**"argyrodyptes" (san julián late eocene/early oligocene of chubut, argentina)**"pterodromoides"**extant genera present in the fossil record***"puffinus" (early oligocene – recent) – includes ""larus" raemdonckii"***"fulmarus" (middle miocene – recent)***"pachyptila" (late miocene – recent)***"calonectris" (early pliocene – recent)***"pterodroma" (pleistocene – recent)***"procellaria"*pelecanoididae – diving-petrels**extant genera present in the fossil record***"pelecanoides" (early/middle miocene – recent)===gaviiformes===*†"neogaeornis" (late cretaceous)*†"polarornis" (late cretaceous)*gaviidae – loons**"colymboides" (late eocene – early miocene) – includes "dyspetornis" and "hydrornis"; paraphyletic?