Gradual evolutionary change in a species without splitting
Anagenesis is the gradual evolution of a species that continues to exist as an interbreeding population. This contrasts with cladogenesis, which occurs when there is branching or splitting, leading to two or more lineages and resulting in separate species.[1] Anagenesis does not always lead to the formation of a new species from an ancestral species.[2] When speciation does occur as different lineages branch off and cease to interbreed, a core group may continue to be defined as the original species. The evolution of this group, without extinction or species selection, is anagenesis.[3]
^Archibald, J.D. (1993). "The importance of phylogenetic analysis for the assessment of species turnover: a case history of Paleocene mammals in North America". Paleobiology. 19 (1): 1–27. Bibcode:1993Pbio...19....1A. doi:10.1017/S0094837300012288. JSTOR 2400768. S2CID 86151240.
^Futuyma, D.J. (1987). "On the role of species in anagenesis". The American Naturalist. 130 (3): 465–473. doi:10.1086/284724. JSTOR 2461899. S2CID 83546424.
to anagenesis, with the addition of speciation to its mechanisms. Diversity on a species-level is able to be achieved through anagenesis. Anagenesis suggests...
species. With anagenesis, the lineage in a phylogenetic tree does not split. To determine whether a speciation event is cladogenesis or anagenesis, researchers...
bosses). The first two genera would be transitional forms, evolving through anagenesis from Styracosaurus. There has been debate about this theory, with later...
intermediate species between D. torosus and D. horneri that evolved through anagenesis, but this theory has been disputed by other researchers. There are also...
have found them to represent distinct species. Some researchers found anagenesis in the group, whether contained in a daspletosaurin clade or paraphyletic...
repeated formations of new species (speciation), changes within species (anagenesis), and loss of species (extinction) throughout the evolutionary history...
phyletic extinction. Effectively, the old taxon vanishes, transformed (anagenesis) into a successor, or split into more than one (cladogenesis). Pseudoextinction...
science Marc Ereshefsky has argued that paraphyletic taxa are the result of anagenesis in the excluded group or groups. A cladistic approach normally does not...
evolutionary biology meaning retrogressive evolution, as contrasted with anagenesis This disambiguation page lists articles associated with the title Catagenesis...
Christian (2023-11-28). "Re-analysis of a dataset refutes claims of anagenesis within Tyrannosaurus-line tyrannosaurines (Theropoda, Tyrannosauridae)"...
were in fact one evolving species (i.e. a chronospecies resulting from anagenesis), but in August 2019, scientists from the same Haile-Selassie team announced...
uniformly by the steady and gradual transformation of whole lineages (anagenesis). In 1972, paleontologists Niles Eldredge and Stephen Jay Gould published...
fossils as evidence, the concept of a chronospecies can be applied. During anagenesis (evolution, not necessarily involving branching), some palaeontologists...
transformation of a whole species into a new one (through a process called anagenesis). In this view no clear line of demarcation exists between an ancestral...
As the primordial species evolves into its daughter species, either by anagenesis or cladogenesis, the ancestral species can be subject to extinction. Throughout...
lead to formation of new species (speciation), changes within lineages (anagenesis), and loss of species (extinction). "Evolution" is also another name for...
; Moore, J. R. (March 30, 2017). "A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system". Scientific Reports. 7: 44942...
Populations of P. andrewsi may have evolved into Bagaceratops through anagenesis. Protoceratops were small ceratopsians, up to 2–2.5 m (6.6–8.2 ft) long...
Anagenic may refer to: Anagenesis, the gradual evolution of a species existing as an interbreeding population Anagen phase, the active growth phase of...
Novak, Johannes; Stuessy, Tod F. (2014-10-08). "Progressive migration and anagenesis in Drimys confertifolia of the Juan Fernández Archipelago, Chile". Journal...
transformation of a whole species into a new one (through a process called anagenesis). In this view no clear line of demarcation exists between an ancestral...
E.; MacLatchy, L. M.; Fisher, D. C. (2019). "Phylogeny, ancestors and anagenesis in the hominin fossil record" (PDF). Paleobiology. 45 (2): 378–393. Bibcode:2019Pbio...
forms it was found related to, suggesting that gradual evolution through anagenesis could be the reason for the intermediate morphologies of many specimens...
specimens, having been found in older layers, might, in a process of anagenesis, represent an early stage of Triceratops evolution. The oldest specimen...
JSTOR 1306666. S2CID 132807103. Scannella, J. B.; Fowler, D. W. (2009). "Anagenesis in Triceratops: evidence from a newly resolved stratigraphic framework...
E.; MacLatchy, L. M.; Fisher, D. C. (2019). "Phylogeny, ancestors and anagenesis in the hominin fossil record" (PDF). Paleobiology. 45 (2): 378–393. Bibcode:2019Pbio...
evolution proponent who advanced concepts now known as genetic drift, anagenesis, cladogenesis, and speciation, sold his shell collection to the Bishop...
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