Chen (genus)

Information about Chen (genus)

White geese

Lesser Snow Goose
(Chen caerulescens caerulescens)

Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Family:	Anatidae
Subfamily:	Anserinae
Genus:	*Chen* (disputed) Boie, 1822

Species

see text.

Synonyms

Philacte Bannister, 1870

The white geese are a small group of waterfowl which are united in the genus or subgenus Chen, in the true geese and swan subfamily Anserinae. They breed on subarctic areas of North America and around the Bering Strait, migrating south in winter.

Many authorities place these species in the grey goose genus Anser. Indeed, Chen and Anser are anatomically indistinguishable. However, external morphology, biogeography, and molecular data suggests that these species are indeed an evolutionary lineage distinct from the grey geese, which split off fairly recently and essentially replaces them in North America. The AOU recognizes this genus as distinct; other authorities more often consider it a subgenus of Anser today.

Like grey but unlike the Branta black geese, their feet and legs are colored in reddish hues. The bill is also reddish in these birds as in most grey geese, except in adult males of Ross's Goose which have a blue-black grainy cere. The wingtips are black, as in all true geese, whereas the head is always white without any markings or pattern in adult birds of this genus, which distinguishes them from all other true geese except feral domesticated geese. The rest of the plumage is either white all over, or colored in various dark bluish-grey hues; the latter birds, uniquely among true geese, do not have white uppertail and undertail coverts, though the tail itself may be white.

White-phase snow geese of both species can be told apart from feral geese best by the more slender, elegant neck, which is thick-set in domestic geese; these also have a generally heavier habitus and often lack black wingtips.

Species

Snow Goose, Chen caerulescens
Ross's Goose, Chen rossii
Emperor Goose, Chen canagica

The supposed fossil dwarf snow goose Chen pressa is now placed in Anser (Brodkorb, 1964).

References

Brodkorb, Pierce (1964): Catalogue of Fossil Birds: Part 2 (Anseriformes through Galliformes). Bulletin of the Florida State Museum 8(3): 195-335. PDF or JPEG fulltext
Carboneras, Carles (1992): Family Anatidae (Ducks, Geese and Swans). In: del Hoyo, Josep; Elliott, Andrew & Sargatal, Jordi (editors): Handbook of Birds of the World, Volume 1: Ostrich to Ducks: 536-629. Lynx Edicions, Barcelona. ISBN 84-87334-10-5

C. caerulescens

Binomial name
Chen caerulescens
(Linnaeus, 1758)

Subspecies

C. c. caerulescens (Lesser Snow Goose)
C. c.

..... Click the link for more information.

Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
..... Click the link for more information.

Editing of this page by unregistered or newly registered users is currently disabled until (UTC) due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or
..... Click the link for more information.

Chordata
Bateson, 1885

Typical Classes

See below

Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates.
..... Click the link for more information.

Aves
Linnaeus, 1758

Orders

About two dozen - see section below

Birds (class Aves) are bipedal, warm-blooded, egg-laying vertebrate animals.
..... Click the link for more information.

Anseriformes
Wagler, 1831

Families

Anhimidae
Anseranatidae
Anatidae
†Dromornithidae
†Presbyornithidae
†Gastornidae(?)

The order Anseriformes
..... Click the link for more information.

Waterbird redirects here. See also shorebirds and seabirds.

Ducks, geese and swans

Black-bellied Whistling Duck (Dendrocygna autumnalis)

Scientific classification
..... Click the link for more information.

Anserinae
Vigors, 1825

Genera

see text
Synonyms

Cygninae

The Anserinae is a subfamily in the waterfowl family Anatidae. It includes the swans and true geese. Under alternative systematical concepts (see e.g.
..... Click the link for more information.

Heinrich Boie (May 4, 1784 - September 4, 1827) was a German zoologist. He was the brother of Friedrich Boie.

Boie studied law at Kiel and Gottingen. At university he became interested in natural history through the lectures of Johann Friedrich Blumenbach and Friedrich
..... Click the link for more information.

18th century - 19th century - 20th century
1790s 1800s 1810s - 1820s - 1830s 1840s 1850s
1819 1820 1821 - 1822 - 1823 1824 1825

:
Subjects: Archaeology - Architecture -
..... Click the link for more information.

species is one of the basic units of biological classification. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.
..... Click the link for more information.

In scientific nomenclature, synonyms are different scientific names used for a single taxon. Usage and terminology are different for zoology and botany.

Zoology

In zoological nomenclature, synonyms are different scientific names that pertain to the same taxon, for example
..... Click the link for more information.

18th century - 19th century - 20th century
1840s 1850s 1860s - 1870s - 1880s 1890s 1900s
1867 1868 1869 - 1870 - 1871 1872 1873

:
Subjects: Archaeology - Architecture -
..... Click the link for more information.

Waterfowl are certain wildfowl of the order Anseriformes, especially members of the family Anatidae, which includes ducks, geese, and swans.

They are strong swimmers with medium to large bodies.
..... Click the link for more information.

genus (plural: genera) is part of the Latinized name for an organism. It is a name which reflects the classification of the organism by grouping it with other closely similar organisms.
..... Click the link for more information.

In biology, a subgenus is a taxon at a rank directly below genus. See rank (botany) and rank (zoology).

In zoology, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the generic and specific name: e.g.
..... Click the link for more information.

Goose (plural geese, male gander(s)) is the English name for a considerable number of birds, belonging to the family Anatidae. This family also includes swans, most of which are larger than geese, and ducks, which are smaller.
..... Click the link for more information.

Cygnus
Bechstein, 1803

Species

6-7 living, see text.
Synonyms

Cygnanser Kretzoi, 1957

Swans are large water birds of the family Anatidae, which also includes geese and ducks.
..... Click the link for more information.

family (Latin: familia, plural familiae) is a rank, or a taxon in that rank. Exact details of formal nomenclature depend on the Nomenclature Code which applies.
..... Click the link for more information.

The subarctic is a region in the Northern Hemisphere immediately south of the true Arctic and covering much of Canada and Siberia, the north of Scandinavia, northern Mongolia and the Chinese province of Heilongjiang.
..... Click the link for more information.

North America is a continent ^[1] in the Earth's northern hemisphere and (chiefly) western hemisphere. It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the south and west
..... Click the link for more information.

Bering Strait (Russian: Берингов пролив) is a sea strait between Cape Dezhnev, Russia, the easternmost point (169°43' W) of the Asian continent and Cape Prince
..... Click the link for more information.

Bird migration refers to the regular seasonal journeys undertaken by many species of birds. Migrations include movements of varied distances made in response to changes in food availability, habitat or weather.
..... Click the link for more information.

Anser
Brisson, 1760

Species
see text.
Synonyms

Chen Boie, 1822 (but see text)
Cygnopsis Brandt, 1836
Cycnopsis Agassiz, 1846 (emendation)
Eulabeia Reichenbach, 1852
Philacte
..... Click the link for more information.

Anatomy (from the Greek ἀνατομία anatomia, from ἀνατέμνειν
..... Click the link for more information.

The term morphology in biology refers to the outward appearance (shape, structure, color, pattern) of an organism or taxon and its component parts. This is in contrast to physiology, which deals primarily with function.
..... Click the link for more information.

Biogeography is the study of the distribution of biodiversity over space and time. It aims to reveal where organisms live, at what abundance, and why.^[1]
..... Click the link for more information.

Editing of this page by unregistered or newly registered users is currently disabled due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or .
..... Click the link for more information.

This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.

Herod_Archelaus