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Neoaves Alternative Cladogram
Neoaves is a clade that consists of all modern birds (Neornithes or Aves) with the exception of Palaeognathae (ratites and kin) and Galloanserae (ducks, chickens and kin). This group is defined in the ''PhyloCode'' by George Sangster and colleagues in 2022 as "the most inclusive crown clade containing ''Passer domesticus'', but not ''Gallus gallus''". Almost 95% of the roughly 10,000 known species of extant birds belong to the Neoaves. The early diversification of the various neoavian groups occurred very rapidly around the Cretaceous–Paleogene extinction event, and attempts to resolve their relationships with each other have resulted initially in much controversy. Phylogeny The early diversification of the various neoavian groups occurred very rapidly around the Cretaceous–Paleogene extinction event. As a result of the rapid radiation, attempts to resolve their relationships have produced conflicting results, some quite controversial, especially in the earlier studies.Matzk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene
The Paleocene ( ), or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by an asteroid impact (Chicxulub impact) and possibly volcanism (Deccan Traps), marked the beginning of the Paleocene and killed off 75% of species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach to taxonomy adopted by most biological fields. The common ancestor may be an individual, a population, or a species (extinct or Extant taxon, extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed ''monophyletic'' (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming Taxon, taxa that are not clades; that is, taxa that are not Monophyly, monophyletic. Some of the relationships between organisms that the molecul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurypygimorphae
Eurypygimorphae or Phaethontimorphae is a clade of birds that contains the orders Phaethontiformes (tropicbirds) and Eurypygiformes (kagu and sunbittern) recovered by genome analysis. The relationship was first identified in 2013 based on their nuclear genes. This group was defined in the ''PhyloCode'' by George Sangster and colleagues in 2022 as "the least inclusive crown clade containing '' Phaethon aethereus'', ''Eurypyga helias The sunbittern (''Eurypyga helias'') is a bittern-like bird of tropical regions of the Americas, and the Monotypic taxon, sole member of the family (biology), family Eurypygidae (sometimes spelled Eurypigidae) and genus ''Eurypyga''. It is found ...'', and '' Rhynochetos jubatus''". Historically these birds were placed at different parts of the tree, with tropicbirds in Pelecaniformes and the kagu and sunbittern in Gruiformes. Some genetic analyses have placed the eurypygimorph taxa in the controversial and obsolete clade Metaves, with uncertai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequornithes
Aequornithes (, from Latin ''aequor'', expanse of water + Greek ''ornithes'', birds), or core water birds, are defined in the ''PhyloCode'' as "the least inclusive crown clade containing '' Pelecanus onocrotalus'' and '' Gavia immer''", that is, the last common ancestor of the great white pelican and the common loon, as well as its descendants, extinct and extant. The monophyly of the group is currently supported by several molecular phylogenetic studies. Aequornithes includes the clades Gaviiformes, Sphenisciformes, Procellariiformes, Ciconiiformes, Suliformes and Pelecaniformes. It does not include several unrelated groups of aquatic birds such as flamingos and grebes ( Mirandornithes), shorebirds, gulls, and auks (Charadriiformes), or the Anseriformes (waterfowl). Based on a whole-genome analysis of the bird orders, the kagu and sunbittern ( Eurypygiformes) and the three species of tropicbirds ( Phaethontiformes) together styled as the Eurypygimorphae are the closest s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polytomy
An internal node of a phylogenetic tree is described as a polytomy or multifurcation if (i) it is in a rooted tree and is linked to three or more child subtrees or (ii) it is in an unrooted tree and is attached to four or more branches. A tree that contains any multifurcations can be described as a multifurcating tree. Soft polytomies vs. hard polytomies Two types of polytomies are recognized, soft and hard polytomies. Soft polytomies are the result of insufficient phylogenetic information: though the lineages diverged at different times – meaning that some of these lineages are closer relatives than others, and the available data does not allow recognition of this. Most polytomies are soft, meaning that they would be resolved into a typical tree of dichotomies if better data were available. In contrast, a hard polytomy represents a true divergence event of three or more lineages. Applications Interpretations for a polytomy depend on the individuals that are represented ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passerea
Passerea is a clade of Neoaves, neoavian birds that was proposed by Jarvis ''et al''. (2014). Their genomic analysis recovered two major clades within Neoaves, Passerea and Columbea, and concluded that both clades appear to have many ecologically driven convergent traits. According to Jarvis (2014), these convergences include the foot-propelled diving trait of grebes in Columbea with loons and cormorants in Passerea; the wading-feeding trait of flamingos in Columbea with ibises and egrets in Passerea; and pigeons and sandgrouse in Columbea with shorebirds (killdeer) in Passerea. For Jarvis (2014), these long-known trait and morphological alliances suggest that some of the traditional nongenomic trait classifications are based on Polyphyly, polyphyletic assemblages. Passerea was not recovered in other studies. Phylogeny Cladogram of Passerea relationships based on Jarvis ''et al.'' (2014) with some clade names after Yuri ''et al.'' (2013) and Kimball ''et al.'' 2013. The fol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbea
Columbea is a clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ... suggested by genome analysis that contains Columbiformes (pigeons and doves), Pteroclidae (sandgrouse), Mesitornithidae (mesites) and Mirandornithes (flamingos and grebes). Until their recent placement as the sister taxon to Passerea, in the last decade various genetic analysis found them to be in the obsolete clade Metaves. References Neognathae Tetrapod unranked clades {{bird-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous–Paleogene Extinction Event
The Cretaceous–Paleogene (K–Pg) extinction event, also known as the K–T extinction, was the extinction event, mass extinction of three-quarters of the plant and animal species on Earth approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs. Most other tetrapods weighing more than also became extinct, with the exception of some ectothermic species such as sea turtles and crocodilians. It marked the end of the Cretaceous period, and with it the Mesozoic era, while heralding the beginning of the current era, the Cenozoic. In the geologic record, the K–Pg event is marked by a thin layer of sediment called the Cretaceous–Paleogene boundary, K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually high levels of the metal iridium, which is more common in asteroids than in the Earth's crust. As originally proposed in 1980 by a team of scientists le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biology Letters
''Biology Letters'' is a peer-reviewed scientific journal published by the Royal Society, established in 2005. It focuses on the rapid publication of short research articles, reviews, and opinion pieces across the biological sciences. The editor-in-chief is David Beerling FRS (University of Sheffield). Contents As well as conventional short research articles, the journal has recently published ''Special Features'' and ''Mini Series''. Special Features are collections of up to 20 articles on a specific theme and published across multiple issues. Mini Series include up to six articles that are published in one issue. History The journal was split off from the '' Proceedings of the Royal Society B: Biological Sciences'' in 2005 after having been published as a supplement. Originally it was published quarterly, then bimonthly, and since 2013 it has been published monthly. Printing ceased at the start of 2020. Abstracting and indexing The journal is abstracted and indexed in: Accord ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gallus Gallus
The red junglefowl (''Gallus gallus''), also known as the Indian red junglefowl (and formerly the bankiva or bankiva-fowl), is a species of Tropics, tropical, predominantly Terrestrial animal, terrestrial bird in the fowl and pheasant family, Phasianidae, found across much of Southeast Asia, Southeast and parts of South Asia. The red junglefowl was the primary species to give rise to today's many breeds of domesticated chicken (''G. g. domesticus''); additionally, the related grey junglefowl (''G. sonneratii''), Sri Lankan junglefowl (''G. lafayettii'') and the green junglefowl, Javanese green junglefowl (''G. varius'') have also contributed genetic material to the gene pool of the modern chicken. Molecular evidence, derived from Whole genome sequencing, whole-genome sequencing, has revealed that the chicken was first domestication, domesticated from red junglefowl ca. 8,000 years ago, with this domestication-event involving multiple maternal origins. Since then, the domestic fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passer Domesticus
The house sparrow (''Passer domesticus'') is a bird of the sparrow family Passeridae, found in most parts of the world. It is a small bird that has a typical length of and a mass of . Females and young birds are coloured pale brown and grey, and males have brighter black, white, and brown markings. One of about 25 species in the genus ''Passer'', the house sparrow is native to most of Europe, the Mediterranean Basin, and a large part of Asia. Its intentional or accidental introductions to many regions, including parts of Australasia, Africa, and the Americas, make it the most widely distributed wild bird. The house sparrow is strongly associated with human habitation, and can live in urban or rural settings. Though found in widely varied habitats and climates, it typically avoids extensive woodlands, grasslands, polar regions, and hot, dry deserts far away from human development. For sustenance, the house sparrow routinely feeds at home and public bird feeding stations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PhyloCode
The ''International Code of Phylogenetic Nomenclature'', known as the ''PhyloCode'' for short, is a formal set of rules governing phylogenetic nomenclature. Its current version is specifically designed to regulate the naming of clades, leaving the governance of species names up to the rank-based nomenclature codes ('' ICN'', '' ICNCP'', '' ICNP'', '' ICZN'', '' ICVCN''). The ''PhyloCode'' is associated with the International Society for Phylogenetic Nomenclature (ISPN). The companion volume, ''Phylonyms'', establishes 300 taxon names under ''PhyloCode'', serving as examples for those unfamiliar with the code. RegNum is an associated online database for registered clade names. The ''PhyloCode'' regulates phylogenetic nomenclature by providing rules for deciding which associations of names and definitions are considered established, which of those will be considered homonyms or synonyms, and which one of a set of synonyms or homonyms will be considered accepted (generally the one ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
