macroevolution


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macroevolution

(măk′rō-ĕv′ə-lo͞o′shən, -ē′və-)
n.
Large-scale evolution occurring over a very long period time that results in the formation of new species and higher-level taxonomic groups.

mac′ro·ev′o·lu′tion·ar′y (-shə-nĕr′ē) adj.

macroevolution

A term of art for large-scale evolution of ecologically separated gene pools, which occurs at or above the level of speciation, resulting in relatively large and complex changes such as anagenesis and cladogenesis stasigenesis.

macroevolution

the collective processes by which new species arise and others become extinct.
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References in periodicals archive ?
Research on animal development and macroevolution over the last thirty years--research done from within the neo-Darwinian framework--has shown that the neo-Darwinian explanation for the origin of new body plans is overwhelmingly likely to be false--and for reasons that Darwin himself would have understood.
(3) When we are just interested in the macroevolution or the essential qualitative phenomenon, it is not necessary to occupy a large number of computing time and resources for quantitative simulation.
Conduct pre- and postdiagnostic tests of macroevolution using the Measure of Understanding of Macroevolution (Nadelson & Southerland, 2010).
David Sepkoski's admirable essay on macroevolution addresses both familiar (such as the pace of evolution and the ontological status of evolutionary units) and not so familiar issues (such as whether microevolutionary mechanisms explain macroevolutionary patterns).
Atria 1998 Chromosomal variation, macroevolution and possible parapatric speciation in Mepraia spinolai (Porter) (Hemiptera: Reduviidae).
Evolution of placentas in the fish family Poeciliidae: An empirical study of macroevolution. Annual Review of Ecology, Evolution and Systematics 40: 271-289.
Nevertheless, the phylogeny of beetles is being revealed via molecular studies with large taxon and gene samples, presenting renewed and novel opportunities for the study of beetle macroevolution.
In the words of one of its main proponents (Mayr, 1963) the synthetic theory maintains that all evolution is due to the accumulation of small genetic changes guided by natural selection, and that transpecific evolution (macroevolution) is nothing more than an extrapolation and magnification of the events that take place within populations and species (microevolution).
Each chapter ends with a pointed discussion on "Classification and macroevolution" with a focus on phylogeny and summaries on "Biogeography and ecology" for its respective division.
The development of structures in the so-called microevolution reflects the development of those of macroevolution, and vice versa, and these structures evolve together.
Such small changes are called "microevolution." The Macroevolution Conference of 1980, however, decided that, contrary to theory, microevolutionary changes did not add up to macroevolutionary changes.
Presented in a debate format, the essays offer different sides of one question, such as whether traits have evolved because of a past advantage, whether species are real, whether selection operates primarily on genes, whether microevolution and macroevolution are governed by the same processes, whether memetics provide a useful way for understanding cultural evolution, whether there is a place for intelligent design in the philosophy of biology, and evolutionary developmental biology versus the neo-Darwinian paradigm.