The order Suliformes (, dubbed "Phalacrocoraciformes" by ''Christidis & Boles 2008'') is an order of birds recognised by the International Ornithologist's Union. Regarding the recent evidence that the traditional

Pelecaniformes The Pelecaniformes are an order of medium-sized and large waterbirds found worldwide. As traditionally (but erroneously) defined, they encompass all birds that have feet with all four toes webbed. Hence, they were formerly also known by such ...

polyphyletic A polyphyletic group is an assemblage that includes organisms with mixed evolutionary origin but does not include their most recent common ancestor. The term is often applied to groups that share similar features known as Homoplasy, homoplasies ...

, it has been suggested that the group be divided to reflect the true evolutionary relationships; a 2017 study indicated that they are most closely related to Otidiformes (bustards) and

Ciconiiformes Storks are large, long-legged, long-necked wading birds with long, stout bills. They belong to the family Ciconiidae, and make up the order Ciconiiformes . Ciconiiformes previously included a number of other families, such as herons and ibise ...

(storks).

Systematics and evolution

Of the families in Pelecaniformes, only

Pelecanidae The Pelecanidae is a family of Pelecaniformes, pelecaniform birds within the Pelecani that contains three genera: the extinct ''Eopelecanus'' and ''Miopelecanus'' and the extant ''Pelecanus''. Pelecanids have existed since the late Eocene (Pria ...

Balaenicipitidae Balaenicipitidae is a family of birds in the order Pelecaniformes, although it was traditionally placed in Ciconiiformes. The shoebill is the sole extant species and its closest relative is the hamerkop (''Scopus umbretta''), which belongs to anot ...

, and

Scopidae ''Scopus'' is a genus of wading birds containing the hamerkop ''(Scopus umbretta)'' and its extinct Pliocene relative, '' Scopus xenopus''. This genus is the sole representative of the family Scopidae. Taxonomy Hamerkops were traditionally inclu ...

remain. The tropicbird family

Phaethontidae Tropicbirds are a family, Phaethontidae, of tropical pelagic seabirds. They are the sole living representatives of the order Phaethontiformes. For many years they were considered part of the Pelecaniformes, but genetics indicates they are most cl ...

has since been moved to their order

Phaethontiformes The Phaethontiformes are an order of birds. They contain one extant family, the tropicbirds (Phaethontidae), and one extinct family Prophaethontidae from the early Cenozoic. Several fossil genera have been described, with well-preserved fossil ...

. Genetic analysis seems to show that the Pelecaniformes are actually closely related to the

Ardeidae Herons are long-legged, long-necked, freshwater and coastal birds in the family Ardeidae, with 75 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genus '' Botaurus'' are referred to as ...

and

Threskiornithidae The family Threskiornithidae includes 36 species of large wading birds. The family has been traditionally classified into two subfamilies, the ibises and the spoonbills; however, recent genetic studies have cast doubt on this arrangement, and ha ...

. As for the Suliformes, they are distantly related to the current Pelecaniformes. According to Hackett ''et al''. (2008),

loons Loons (North American English) or divers (British / Irish English) are a group of aquatic birds found in much of North America and northern Eurasia. All living species of loons are members of the genus ''Gavia'', family Gaviidae and order Gav ...

penguins Penguins are a group of aquatic flightless birds from the family Spheniscidae () of the order Sphenisciformes (). They live almost exclusively in the Southern Hemisphere. Only one species, the Galápagos penguin, is equatorial, with a sm ...

storks Storks are large, long-legged, long-necked wading birds with long, stout Beak, bills. They belong to the family (biology), family Ciconiidae, and make up the order Ciconiiformes . Ciconiiformes previously included a number of other families, suc ...

, and as well as Suliformes and Pelecaniformes, all seem to have evolved from a common ancestor. The proposed

waterbird A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water. In some definitions, the term ''water bird'' is especially applied to birds in freshwater ecosystems, although others make no distinction from seabi ...

superorder has been suggested. In their landmark 2008 work ''Systematics and Taxonomy of Australian Birds'', Australian ornithologists Les Christidis and Walter E. Boles coined the name Phalacrocoraciformes for the group due to the much greater number of species of cormorants (

Phalacrocoracidae Phalacrocoracidae is a family of approximately 40 species of aquatic birds commonly known as cormorants and shags. Several different classifications of the family have been proposed, but in 2021 the International Ornithologists' Union (IOU) ado ...

) over boobies and gannets (

Sulidae The bird family Sulidae comprises the gannets and boobies. Collectively called sulids, they are medium-large coastal seabirds that plunge-dive for fish and similar prey. The 10 species in this family are often considered congeneric in older so ...

). However, this has not been taken up elsewhere. In 1994, American ornithologist Walter J. Bock wrote that the name Suloidea had been used consistently as a term for a superfamily containing the two families, so therefore "Sulidae" and not "Phalacrocoracidae" should take priority in any arrangement containing the two genera. In 2010, the AOU adopted the term Suliformes for the taxon. The IOC followed in 2011. In 1994, Martyn Kennedy and colleagues constructed a behavioural data set, with the resulting tree showing a high level of congruence with existing phylogenies based on genetics or morphology. It showed the darters as sister group to the cormorants and shags, with the gannets and boobies, then pelicans, then frigatebirds and lastly tropicbirds as progressively earlier offshoots.

Cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ...

based on Gibb, G.C. ''et al''. (2013)

Species

Fregatidae Frigatebirds are a Family (biology), family of seabirds called Fregatidae which are found across all tropical and subtropical oceans. The five extant species are classified in a single genus, ''Fregata''. All have predominantly black plumage, l ...

Magnificent frigatebird The magnificent frigatebird (''Fregata magnificens''), frigate petrel or man o' war is a seabird of the frigatebird family Fregatidae. With a length of and wingspan of , it is the largest species of frigatebird. It occurs over tropical and subtr ...

or man o'war, ''Fregata magnificens'' **

Ascension frigatebird The Ascension frigatebird (''Fregata aquila'') is a seabird of the frigatebird family Fregatidae which breeds on Boatswain Bird Island and Ascension Island in the tropical Atlantic Ocean. The Ascension frigatebird is a large lightly built se ...

, ''Fregata aquila'' **

Christmas Island frigatebird The Christmas frigatebird (''Fregata andrewsi''), or Christmas Island frigatebird, is a seabird of the frigatebird family Fregatidae which is an endemic breeder to Christmas Island in the Indian Ocean. Apart from the Ascension frigatebird, the th ...

, ''Fregata andrewsi'' **

Great frigatebird The great frigatebird (''Fregata minor'') is a large seabird in the frigatebird family (biology), family. There are major nesting populations in the tropical Pacific Ocean, such as Hawaii and the Galápagos Islands; in the Indian Ocean, colonies ...

, ''Fregata minor'' **

Lesser frigatebird The lesser frigatebird (''Fregata ariel'') is a seabird of the frigatebird family Fregatidae. At around 75 cm (30 in) in length, it is the smallest species of frigatebird. It occurs over tropical and subtropical waters across the Indian ...

, ''Fregata ariel'' *

Blue-footed booby The blue-footed booby (''Sula nebouxii'') is a marine bird native to subtropical and tropical regions of the eastern Pacific Ocean. It is one of six species of the genus ''booby, Sula'' – known as boobies. It is easily recognizable by its dis ...

, ''Sula nebouxii'' **

Peruvian booby The Peruvian booby (''Sula variegata'') is an endemic bird of the Peruvian current, and an important predator of the marine community to which it belongs. Its distribution is much less widespread than other closely related booby species. It is th ...

, ''Sula variegata'' **

Masked booby The masked booby (''Sula dactylatra''), also called the masked gannet or the blue-faced booby, is a large seabird of the booby and gannet family, Sulidae. First described by the French naturalist René-Primevère Lesson in 1831, the masked boob ...

, ''Sula dactylatra'' **

Nazca booby The Nazca booby (''Sula granti'') is a large seabird of the booby family, Sulidae, native to the eastern Pacific. First described by Walter Rothschild in 1902, it was long considered a subspecies of the masked booby until recognised as distin ...

, ''Sula granti'' **

Red-footed booby The red-footed booby (''Sula sula'') is a large seabird of the booby family, Sulidae. Adults always have red feet, but the colour of the plumage varies. They are powerful and agile fliers, but they are clumsy in takeoffs and landings. They are ...

, ''Sula sula'' **

Brown booby The brown booby (''Sula leucogaster'') is a large seabird of the booby family Sulidae, of which it is perhaps the most common and widespread species. It has a pantropical range, which overlaps with that of other booby species. The gregarious bro ...

, ''Sula leucogaster'' **

Abbott's booby Abbott's booby (''Papasula abbotti'') is an endangered seabird of the Sulidae, sulid family, which includes gannets and Booby, boobies. It is a large booby and is placed within its own monotypic genus. It was first identified from a specimen col ...

, ''Papasula abbotti'' **

Northern gannet The northern gannet (''Morus bassanus'') is a seabird, the largest species of the gannet family, Sulidae. It is native to the coasts of the Atlantic Ocean, breeding in Western Europe and Northeastern North America. It is the largest seabird in t ...

, ''Morus bassanus'' **

Cape gannet The Cape gannet (''Morus capensis'') is a large seabird of the gannet family, Sulidae. They are easily identified by their large size, black and white plumage and distinctive yellow crown and hindneck. The pale blue bill is pointed with fine se ...

, ''Morus capensis'' **

Australasian gannet The Australasian gannet (''Morus serrator''), also known as the Australian gannet or tākapu, is a large seabird of the booby and gannet family, Sulidae. Adults are mostly white, with black flight feathers at the wingtips and lining the trailing ...

, ''Morus serrator'' *

Pygmy cormorant The pygmy cormorant (''Microcarbo pygmaeus'') is a member of the Phalacrocoracidae (cormorant) family of seabirds. It breeds in south-eastern Europe and south-western Asia. It is partially migratory, with northern populations wintering further ...

, ''Microcarbo pygmaeus'' **

Reed cormorant The reed cormorant (''Microcarbo africanus''), also known as the long-tailed cormorant, is a bird in the cormorant family Phalacrocoracidae. It breeds in much of Africa south of the Sahara, and Madagascar. It is resident but undertakes some seas ...

, ''Microcarbo africanus'' ** Crowned cormorant, ''Microcarbo coronatus'' **

Little cormorant The little cormorant (''Microcarbo niger'') is a member of the cormorant family of seabirds. Slightly smaller than the Indian cormorant it lacks a peaked head and has a shorter beak. It is widely distributed across the Indian Subcontinent and ext ...

, ''Microcarbo niger'' **

Little pied cormorant The little pied cormorant, little shag or kawaupaka (''Microcarbo melanoleucos'') is a common species of Australasian waterbird, found around the coasts, islands, Estuary, estuaries, and inland waters of Australia, New Guinea, New Zealand, Timor- ...

, ''Microcarbo melanoleucos'' **

Brandt's cormorant Brandt's cormorant (''Urile penicillatus'') is a strictly marine bird of the cormorant family of seabirds that inhabits the Pacific coast of North America. It ranges, in the summer, from Alaska to the Gulf of California, but the population north ...

, ''Urile penicillatus'' **

Red-faced cormorant The red-faced cormorant (''Urile urile''), red-faced shag or violet shag, is a bird species of the family Phalacrocoracidae. Its range spans from the eastern tip of Hokkaidō in Japan, northern korean peninsula, via the Kuril Islands, the sout ...

, ''Urile urile'' **

Pelagic cormorant The pelagic cormorant (''Urile pelagicus''), also known as Baird's cormorant or violet-green cormorant, is a small member of the cormorant family Phalacrocoracidae. Analogous to other smallish cormorants, it is also called the pelagic shag occas ...

, ''Urile pelagicus'' **†

Spectacled cormorant The spectacled cormorant or Pallas's cormorant (''Urile perspicillatus'') is an extinct marine bird of the cormorant family of seabirds that inhabited Bering Island and possibly other places in the Commander Islands and the nearby coast of Kamch ...

, ''Urile perspicillatus'' (extinct) ** Bank cormorant, ''Phalacrocorax neglectus'' **

Socotra cormorant The Socotra cormorant (''Phalacrocorax nigrogularis'') is a threatened species of cormorant that is endemic to the Persian Gulf and the south-east coast of the Arabian Peninsula. It is also sometimes known as the Socotran cormorant or, more ra ...

, ''Phalacrocorax nigrogularis'' **

Pitt shag The Pitt shag (''Phalacrocorax featherstoni''), also known as the Pitt Island shag or Featherstone's shag, is a species of bird in the family Phalacrocoracidae. It is endemic to Pitt Island where its natural habitats are open seas and rocky shor ...

, ''Phalacrocorax featherstoni'' **

Spotted shag The spotted shag or pārekareka (''Phalacrocorax punctatus'') is a species of cormorant endemic to New Zealand. Though originally classified as ''Phalacrocorax punctatus'', it is sufficiently different in appearance from typical members of tha ...

, ''Phalacrocorax punctatus'' **

Black-faced cormorant The black-faced cormorant (''Phalacrocorax fuscescens''), also known as the black-faced shag, is a medium-sized member of the cormorant family. Upperparts, including facial skin and bill, are black, with white underparts. It is Endemism, endem ...

, ''Phalacrocorax fuscescens'' **

Australian pied cormorant The Australian pied cormorant (''Phalacrocorax varius''), also known as the pied cormorant, pied shag, or great pied cormorant, is a medium-sized member of the cormorant family. It is found around the coasts of Australasia. In New Zealand, it ...

, ''Phalacrocorax varius'' **

Little black cormorant The little black cormorant (''Phalacrocorax sulcirostris'') is a member of the cormorant family of seabirds. It is common in smaller rivers and lakes throughout most areas of Australia and northern New Zealand, where it is known as the little bla ...

, ''Phalacrocorax sulcirostris'' **

Indian cormorant The Indian cormorant or Indian shag (''Phalacrocorax fuscicollis'') is a member of the cormorant family. It is found mainly along the inland waters of the Indian Subcontinent but extends west to Sind and east to Thailand and Cambodia. It is a gre ...

, ''Phalacrocorax fuscicollis'' **

Cape cormorant The Cape cormorant or Cape shag (''Phalacrocorax capensis'') is a bird endemic to the southwestern coasts of Africa. It breeds from the coastal area of Namibia Namibia, officially the Republic of Namibia, is a country on the west coast o ...

, ''Phalacrocorax capensis'' ** Japanese cormorant, ''Phalacrocorax capillatus'' **

White-breasted cormorant The white-breasted cormorant (''Phalacrocorax carbo lucidus'') is a subspecies of the widely distributed great cormorant, formerly often considered to be a separate species. Its distinguishing features include a white breast and a preference for ...

, ''Phalacrocorax lucidus'' **

Great cormorant The great cormorant (''Phalacrocorax carbo''), also known as just cormorant in Britain, as black shag or kawau in New Zealand, formerly also known as the great black cormorant across the Northern Hemisphere, the black cormorant in Australia, and ...

, ''Phalacrocorax carbo'' **

European shag The European shag or common shag (''Gulosus aristotelis'') is a species of cormorant. It is the only member of the monotypic genus ''Gulosus''. It breeds around the rocky coasts of western and southern Europe, southwest Asia and north Africa, ma ...

, ''Gulosus aristotelis'' **

Flightless cormorant The flightless cormorant (''Nannopterum harrisi''), also known as the Galapagos cormorant, is a cormorant endemic to the Galapagos Islands, and an example of the highly unusual fauna there. It is unique in that it is the only known cormorant th ...

, ''Nannopterum harrisi'' **

Neotropic cormorant The neotropic cormorant or olivaceous cormorant (''Nannopterum brasilianum'') is a medium-sized cormorant found throughout the American tropics and subtropics, from the middle Rio Grande and the Gulf and Californian coasts of the United States so ...

, ''Nannopterum brasilianum'' **

Double-crested cormorant The double-crested cormorant (''Nannopterum auritum'') is a member of the cormorant family of water birds. It is found near rivers and lakes and in coastal areas and is widely distributed across North America, from the Aleutian Islands in Alaska ...

, ''Nannopterum auritum'' **

Rock shag The rock shag (''Leucocarbo magellanicus''), also known as the Magellanic cormorant, is a marine cormorant found around the southernmost coasts of South America. Its breeding range is from around Valdivia, Chile, south to Cape Horn and Tierra de ...

, ''Leucocarbo magellanicus'' **

Guanay cormorant The guanay cormorant or guanay shag (''Leucocarbo bougainvilliorum'') is a member of the cormorant family found on the Pacific coast of Peru and northern Chile. After breeding it spreads south to southern parts of Chile and north to Ecuador, and ...

, ''Leucocarbo bougainvillii'' **

Bounty shag The Bounty shag (''Leucocarbo ranfurlyi''), also known as the Bounty Island shag, is a species of cormorant of the family Phalacrocoracidae. They are found only on the tiny and remote Subantarctic Bounty Islands, southeast of New Zealand. Its ...

, ''Leucocarbo ranfurlyi'' **

New Zealand king shag The New Zealand king shag (''Leucocarbo carunculatus''), also known as the rough-faced shag, king shag or kawau pāteketeke, is a rare bird endemic to New Zealand. Some taxonomic authorities, including the International Ornithologists' Union, p ...

, ''Leucocarbo carunculatus'' **

Chatham shag The Chatham Islands shag (''Leucocarbo onslowi''), also known as the Chatham shag, is a species of bird in the cormorant and shag family, Phalacrocoracidae. It is endemic to the Chatham Islands of New Zealand. For a long time the species was pl ...

, ''Leucocarbo onslowi'' **

Otago shag The Stewart Island shag (''Leucocarbo chalconotus''; ) is a species of shag found on New Zealand's South Island and Stewart Island. The Stewart Island shag has sometimes been split into two species, the Foveaux shag and the Otago shag. Taxon ...

, ''Leucocarbo chalconotus'' ** Foveaux shag, ''Leucocarbo stewarti'' ** Auckland shag, ''Leucocarbo colensoi'' ** Campbell shag, ''Leucocarbo campbelli'' **

Imperial shag The imperial shag or imperial cormorant (''Leucocarbo atriceps'') is a black-and-white cormorant native to southern South America, islands of the Subantarctic, and the Antarctic Peninsula, primarily in rocky coastal regions, but locally also at ...

, ''Leucocarbo atriceps'' ** South Georgia shag, ''Leucocarbo georgianus'' **

Crozet shag The Crozet shag (''Leucocarbo melanogenis''), also known as the South Georgia cormorant, is a marine cormorant native to the Crozet, Prince Edward and Marion islands in the South Atlantic Ocean. Characteristics The Crozet shag is a member o ...

, ''Leucocarbo melanogenis'' ** Antarctic shag, ''Leucocarbo bransfieldensis'' **

Kerguelen shag The Kerguelen shag (''Leucocarbo verrucosus'') is a species of cormorant endemic to the Kerguelen Islands in the southern Indian Ocean, one of the most isolated places on Earth. Many authorities consider it a subspecies of the imperial shag. Ran ...

, ''Leucocarbo verrucosus'' ** Heard Island shag, ''Leucocarbo nivalis'' ** Macquarie shag, ''Leucocarbo purpurascens'' * Anhingidae **

Anhinga The anhinga (; ''Anhinga anhinga''), sometimes called snakebird, darter, American darter, or water turkey, is a water bird of the warmer parts of the Americas. The word ''anhinga'' comes from ''a'ñinga'' in the Brazilian Tupi language and means ...

or American darter, ''Anhinga anhinga'' **

Oriental darter The Oriental darter (''Anhinga melanogaster'') is a water bird of tropical South Asia and Southeast Asia. It has a long and slender neck with a straight, pointed bill and, like the cormorant, it hunts for fish while its body is submerged in water ...

or Indian darter, ''Anhinga melanogaster'' **

African darter The African darter (''Anhinga rufa''), sometimes called the snakebird, is a water bird of sub-Saharan Africa and Iraq. Taxonomy The African darter is a member of the darter family, Anhingidae, and is closely related to Anhinga, American (''Anhin ...

, ''Anhinga rufa'' **

Australasian darter The Australasian darter or Australian darter (''Anhinga novaehollandiae'') is a species of bird in the darter family, Anhingidae. It is found in Australia, Indonesia, and Papua New Guinea. It weighs around 2.6 kg and spans in length. Taxo ...

or Australian darter, ''Anhinga novaehollandiae''

References

{{Taxonbar, from=Q21728 Seabirds Bird orders Taxa named by Richard Bowdler Sharpe