Phyletic Evolution

phyletic evolution

[fī′led·ik ‚ev·ə′lü·shən]
(evolution)
The gradual evolution of population without separation into isolated parts.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Phyletic Evolution

 

a type of evolution characterized by the gradual change, without divergence, of an entire group of organisms. The term “phyletic evolution” was proposed by the American paleontologist G. Simpson, who distinguished it from speciation, the divergent development of two or more daughter species from a single parent species. However, it is now recognized that speciation occurs even with phyletic evolution, but the new species are formed successively, over a significant period of time. Phyletic evolution is usually characterized by moderate or low evolution rates and is detected when one studies the evolution of supraspeciestaxons.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Analysis on genetic diversity and phyletic evolution of mitochondrial DNA from Tibetan yaks.
In future studies, the C values of species from the order Rhynchonellida, which have not yet been determined, must be examined, and relationships between C values and phyletic evolution should be examined because the phyletic relationship of brachiopods has not yet been clarified.
Chronological isolation occurs when one species evolves into another over time (phyletic evolution).