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Sarkidiornis
Comb duck (Sarkidiornis sylvicola)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Family:	Anatidae
Subfamily:	Tadorninae
Genus:	Sarkidiornis Eyton, 1838

Sarkidiornis is a genus within the family Anatidae comprising two species that inhabit aquatic environments in tropical and subtropical regions of South America, Africa and southern Asia.. Sarkidiornis is sometimes considered a monotypic genus with its sole member the knob-billed duck (S. melanotos), a cosmopolitan species.

Taxonomy

This genus was first described in 1838 by Thomas Campbell Eyton. The type species, Anser melanotos (S. melanotos), was originally described in 1769 by Thomas Pennant, based on a bird collected in what is now Sri Lanka.

Etymologically, the term Sarkidiornis is derived from Greek, where sarkidion means "little meat" or "caruncle", and ornis means "bird". This name refers to the fleshy crest at the base of the male’s beak.

Most taxonomic authorities, however, split the species into two:

Genus Sarkidiornis – Eyton, 1838 – two species

Common name	Scientific name and subspecies	Range	Size and ecology	IUCN status and estimated population
Knob-billed duck Male Female	Sarkidiornis melanotos (Pennant, 1769)	Sub-Saharan Africa, Madagascar and Southern Asia from Pakistan to Laos and extreme southern China	Size: Habitat: Diet:	LC
Comb duck Male Female	Sarkidiornis sylvicola (Ihering, HFA & Ihering, R, 1907)	eastern Paraguay, southeastern Brazil and extreme northeastern Argentina	Size: Habitat: Diet:	LC

References

1. Eyton, T. C.; Hullmandel, Charles Joseph; Lear, Edward; Scharf, George (1838). A monograph on the anatidae, or duck tribe /. London: Longman, Orme, Brown, Green, & Longman ... and Eddowes, Shrewsbury. doi:10.5962/bhl.title.51971.
2. Pennant, Thomas; Mazell, Peter (1769). Indian zoology /. : . p. 11-12. doi:10.5962/bhl.title.153157.

• https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=175243#null ITIS reference

v t e Genera of waterfowl and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Clade: Neognathae Superorder: Galloanserae Avemetatarsalia see Avemetatarsalia Theropoda see Theropoda Maniraptora see Maniraptora Anserimorphae see below↓
Anserimorphae Anserimorphae †Conflicto †Gastornis? †Dromornithidae? †Pelagornithidae? †Vegaviidae? †Presbyornithidae Bumbalavis Headonornis? Murgonornis Presbyornis Proherodius Telmabates Teviornis Wilaru †Anachronornithidae Anachronornis Danielsavis? Anseriformes sensu stricto †Agnopterus? †Eonessa †"Headonornis"? †Naranbulagornis †Paakniwatavis †Palaeopapia †Peioa †Petropluvialis? †Proherodius? †Wunketru Anhimae †Chaunoides Anhimidae Anhima †Chainkanas Chauna Anseres Anseranatoidea †Anatalavis? Anseranatidae Anseranas †Anserpica †Eoanseranas Anatoidea †Paranyrocidae Paranyroca Anatidae See below ↓
Anatidae Anatidae †Aldabranas? †Allgoviachen †Ankonetta? †Awengkere †Bambolinetta? †Caerulonettion †Cayaoa? †Chelychelynechen? †Cousteauvia †Eonerornis? †Eutelornis? †Garganornis? †Helonetta? †Heteroanser? †Lavanttalornis †Loxornis? †Mioquerquedula? †Nogusunna? †Notochen †Proanser? †Protomelanitta? †Ptaiochen? †Selenonetta †Sharganetta? †Sinanas? †Tagayanetta †Talpanas? †Teleornis? †Thambetochen? †Wasonaka? †Romainvillinae Paracygnopterus Romainvillia Saintandrea Dendrocygninae Dendrocygna Thalassornis †Dendrocheninae Dendrochen Manuherikia Mionetta Stictonettinae Stictonetta Anserinae †Afrocygnus †Annakacygna Anser †Anserobranta †Asiavis †Bonibernicla Branta Cereopsis †"Chenopis" †Cnemiornis Coscoroba †Cygnavus Cygnus †Cygnopterus †Eremochen †Megalodytes †Paracygnus †Presbychen Tadorninae Alopochen †Australotadorna †Brantadorna Cairina †Centrornis Chloephaga Cyanochen Hymenolaimus †Kaikenia Merganetta †Miotadorna †Nannonetta Neochen Plectropterus †Pleistoanser Radjah Sarkidiornis Tachyeres Tadorna †Tamtamia Anatinae Aix Amazonetta †Anabernicula Asarcornis Biziura Callonetta †Chenoanas? Chenonetta †Dunstanetta †Eoneornis? †Lavadytis Lophonetta Malacorhynchus Marmaronetta Netta Nettapus †Pinpanetta Pteronetta †?Rhodonessa Salvadorina Speculanas Oxyurini Heteronetta Nomonyx Oxyura †Tirarinetta Mergini Bucephala †Camptorhynchus †Chendytes Clangula Histrionicus Lophodytes Melanitta Mergellus Mergus Polysticta †Shiriyanetta Somateria Anatini Anas Mareca †Matanas Sibirionetta Spatula Aythyini Aythya

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