Sarkidiornis

{{Automatic taxobox

| name = Sarkidiornis

| image= Comb duck.jpg

| image_caption= Comb duck (Sarkidiornis sylvicola)

| taxon = Sarkidiornis

| authority = 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.{{cite book | last1=Eyton | first1=T. C. | last2=Hullmandel | first2=Charles Joseph | last3=Lear | first3=Edward | last4=Scharf | first4=George | title=A monograph on the anatidae, or duck tribe / | publisher=Longman, Orme, Brown, Green, & Longman ... and Eddowes, Shrewsbury | publication-place=London | year=1838 | doi=10.5962/bhl.title.51971 | page=| url=https://www.biodiversitylibrary.org/item/111070 }} 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.{{cite book | last1=Pennant | first1=Thomas | last2=Mazell | first2=Peter | title=Indian zoology / | publisher=[publisher not identified] | publication-place=[London] | year=1769 | doi=10.5962/bhl.title.153157 | page=11-12| url=https://www.biodiversitylibrary.org/item/257318 }}

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^{{{who?|date=February 2021}}}, however, split the species into two:

{{Species table |genus= Sarkidiornis |authority-name=Eyton|authority-year= 1838 |species-count=two|no-note=y|narrow-percent=75}}

{{Species table/row

|name=Knob-billed duck |binomial=Sarkidiornis melanotos

|image=File:Knob-billed duck (Sarkidiornis melanotos) male.jpg|image-size=180px |image-alt=|image-caption=Male

|image2 =File:Knob-billed Duck (female) I IMG 0985.jpg|image2-caption=Female

|authority-name=Pennant|authority-year= 1769 |authority-not-original=yes

|range= Sub-Saharan Africa, Madagascar and Southern Asia from Pakistan to Laos and extreme southern China

|range-image=File:Sarkidiornis melanotos distribution.png

|range-image-size=180px

|size=

|habitat=

|hunting=

|iucn-status= LC

|population=

|direction=

|subspecies=

}}

{{Species table/row

|name=Comb duck |binomial=Sarkidiornis sylvicola

|image=File:Sarkidiornis sylvicola (male, captive).jpg|image-size=180px |image-alt=|image-caption=Male

|image2 =File:Amerikanische Höckerglanzgans Sarkidiornis sylvicola 050807.jpg|image2-caption=Female

|authority-name=Ihering, HFA & Ihering, R|authority-year=1907 |authority-not-original=yes

|range= eastern Paraguay, southeastern Brazil and extreme northeastern Argentina

|range-image=File:Sarkidiornis sylvicola map.svg