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Screamer
The screamers are three South American bird species placed in Family (biology), family Anhimidae. They were thought to be related to the Galliformes because of similar beak, bills, but are more closely related to the family Anatidae, i.e. ducks and allies, and the magpie goose, within the clade Anseriformes. The clade is exceptional within the living birds in lacking uncinate processes of ribs. The three species are: The horned screamer (''Anhima cornuta''); the southern screamer or crested screamer (''Chauna torquata''); and the northern screamer or black-necked screamer (''Chauna chavaria''). Systematics and evolution Anhimids are most similar to Presbyornithidae, presbyornithids, with which they may form a clade to the exclusion of the rest of Anseriformes. Given the presence of lamelae in the otherwise fowl-like beaks of screamers, it is even possible that they evolved from Presbyornithidae, presbyornithid-grade birds, reverting from a filter-feeding lifestyle to an herbivoro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anhima
The horned screamer (''Anhima cornuta'') is a species of bird that belongs to a relatively small family, the Anhimidae, which occurs in wetlands of tropical South America. There are three screamer species, the other two being the southern screamer and the northern screamer in the genus ''Chauna''. They are related to ducks, goose, geese and swans, which are in the family Anatidae, but have bills looking more like those of Galliformes, game birds. Taxonomy Already known in the 17th century, the horned screamer was Species description, described in 1766 by the Swedish naturalist Carl Linnaeus in the 12th edition of Systema Naturae, twelfth edition of his ''Systema Naturae''. He introduced the binomial nomenclature, binomial name ''Palamedea cornuta''. The horned screamer is now the only species placed in the genus ''Anhima'' that was introduced by the French zoologist Mathurin Jacques Brisson in 1760. The specific epithet ''cornuta'' is the Latin word for "horned". The German natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Screamer
The southern screamer (''Chauna torquata'') is a species of bird in family Anhimidae of the waterfowl order Anseriformes. It is found in Argentina, Bolivia, Brazil, Paraguay, Peru, and Uruguay.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved July 24, 2022 Taxonomy and systematics The southern screamer shares genus ''Chauna'' with the northern screamer (''C. chavaria''). One other species, the horned screamer (''Anhima cornuta'') is also in family Anhimidae. The southern screamer is monotypic. Description The southern screamer is one of the largest birds of southern South America at long and weighing about . Their flat wing measures , their tail , and their Culmen (bird), culmen . They are stout bodied with a disproportion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Screamer
The northern screamer (''Chauna chavaria'') is a Near Threatened species of bird in family Anhimidae of the waterfowl order Anseriformes. It is found in Colombia and Venezuela. Taxonomy and systematics The northern screamer shares genus ''Chauna'' with the southern screamer (''C. torquata''). One other species, the horned screamer (''Anhima cornuta'') is also in family Anhimidae. The northern screamer is monotypic. Description The northern screamer is long. They are stout bodied with a disproportionately small head and a gray bill. The sexes have the same plumage. Adults have a gray crown with a long crest, a mostly white face, a wide black band around the neck, and a dark gray body, wings, and tail. Their wing has two sharp spurs at its manus. They have bare red skin around their brown eye and reddish orange legs and feet. Juveniles are similar to adults but drabber.Carboneras, C., P. F. D. Boesman, G. M. Kirwan, and C. J. Sharpe (2020). Northern Screamer (''Chauna chavar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chauna
''Chauna'' is a genus of birds in the screamer family. Its two members are found in wetlands of South America. Description They are large, bulky birds, with a small downy head, long legs and large feet which are only partially webbed. They have large spurs on their wings which are used in fights over mates and territorial disputes. Conservation The southern screamer is overall fairly common and sometimes considered a pest as it raids crops and competes with farm birds for food. In contrast, the northern screamer is relatively rare and therefore considered near threatened A near-threatened species is a species which has been Conservation status, categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature (IUCN) as that may be vulnerable to Endangered species, endangerment in the ne .... Species References Further reading * {{Taxonbar, from=Q2662452 Anhimidae Bird genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Screamer
The northern screamer (''Chauna chavaria'') is a Near Threatened species of bird in family Anhimidae of the waterfowl order Anseriformes. It is found in Colombia and Venezuela. Taxonomy and systematics The northern screamer shares genus ''Chauna'' with the southern screamer (''C. torquata''). One other species, the horned screamer (''Anhima cornuta'') is also in family Anhimidae. The northern screamer is monotypic. Description The northern screamer is long. They are stout bodied with a disproportionately small head and a gray bill. The sexes have the same plumage. Adults have a gray crown with a long crest, a mostly white face, a wide black band around the neck, and a dark gray body, wings, and tail. Their wing has two sharp spurs at its manus. They have bare red skin around their brown eye and reddish orange legs and feet. Juveniles are similar to adults but drabber.Carboneras, C., P. F. D. Boesman, G. M. Kirwan, and C. J. Sharpe (2020). Northern Screamer (''Chauna chavar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaunoides
''Chaunoides'' is an extinct genus of screamer. Only one species of this genus is known, ''Chaunoides antiquus'' from the upper Oligocene or lower Miocene Tremembé Formation of Brazil. It was smaller and more gracile than all living screamers. Description ''Chaunoides'' is a small screamer, but still large when compared to most living ducks and geese. Its legs are similar in length to the other species of screamer, but thinner and less pneumatized, consistent with a more gracile body. The skeletal material is relatively fragmentary, including only a coracoid and fragmentary limb material. Like the femur, many of the skeletal elements of ''Chaunoides'' are less pneumatized than the living screamers. The coracoid is more slender than any living screamer, and smaller overall. Conclusive reconstructions or size estimates of the entire animal are difficult due to a lack of available fossil material. Paleoecology The Tremembe Formation is a small lacustrine deposit composed mainl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leonhard Hess Stejneger
Leonhard Hess Stejneger (30 October 1851 – 28 February 1943) was a Norwegian-born American ornithologist, herpetologist and zoologist. Stejneger specialized in vertebrate natural history studies. He gained his greatest reputation with reptiles and amphibians. Wetmore, Alexander (1945). "Leonhard Hess Stejneger (1851–1943)". ''Biographical Memoir. Nat. Acad. Sci.'' 24: 145–195PDF/ref> Early life and family Stejneger was born in Bergen, Norway. His father was Peter Stamer Steineger, a merchant and auditor; his mother was Ingeborg Catharine (née Hess). Leonhard was the eldest of seven children. His sister Agnes Steineger was a Norwegian artist. Until 1880, the Steineger family had been one of the wealthy families in Bergen; at that time business reverses led to the father declaring bankruptcy. Stejneger attended the Smith Theological School in Bergen from 1859 to 1860, and Bergen Latin School until 1869. His interests in zoology developed early. By age sixteen, he had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''Ēṓs'', 'Eos, Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isoto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
