Anseriformes is the scientific name for the order of waterfowl, also known as wildfowl. This order of aquatic birds includes all of the world's ducks, geese, swans and screamers.
The order of Anseriformes includes 178 species* in 53 genera, divided over three families:
Anatidae is likely sister to Anseranatidae, which in turn is sister to Anhimidae (Hackett et al. 2008). The Dendrocygna whistling-ducks are either embedded within Anatidae (Eo et al. 2009) or sister to it (Donne-Goussé et al. 2002, Gonzalez et al. 2009). The super-tree analysis by Eo et al. (2009) served to reinforce how elusive consensus is regarding relationships within the Anatidae. The arrangement of genera here follows that used by Del Hoyo and Collar (2014), but it must remain clear that many of these groups are likely paraphyletic and their boundaries in need of further definition - HBW**
Above: a variety of dabbling ducks (Anas sp.) in aviculture.
Screamers (Anhimidae)
Magpie goose (Anseranatidae)
Whistling ducks or Tree ducks (Dendrocygnidae)
White-backed duck, Thalassornis leuconotus
Above: Spotted whistling duck, Dendrogygna guttata, in aviculture.
Stiff-tailed ducks and relatives (Oxyurinae)
Above: Maccoa duck, Oxyura maccoa, in aviculture.
Geese and swans (Anserinae)
Above: Pacific brent geese, Branta bernicla nigricans, in aviculture.
Spur-winged goose (Plectropterinae)
Shelducks, sheldgeese and relatives (Tadorninae)
Above: Radjah shelduck, Radjah radjah, in aviculture.
Ducks (Anatinae)
Common merganser (Goosander), Mergus merganser
Above: Common teal, Anas crecca, in aviculture.
* The 178 species include several species that have extinct since 1500, such as pink-headed duck, Labrador duck and Auckland merganser.
** Lynx Edicions and BirdLife International have published the HBW-BirdLife Illustrated Checklist of the Birds of the World in 2014. The new Checklist is based on the application of criteria for recognising species limits described by Tobias et al. (2010). Full details of the specific scores and the basis of these for each new taxonomic revision are provided in the Checklist. This Checklist also forms the taxonomic basis of BirdLife’s assessments of the status of the world’s birds for the IUCN Red List.
Above: Australian white-eyed pochard, Aythya australis, in aviculture.