Before the mid-1800s, classification of organisms into groups, called taxa, was generally based on overall similarity of physical appearance. There was no guiding principle as to why the members of one group were more similar to each other than to the...

Phylogeny is the inferred evolutionary history of a group of organisms. Paleontologists are interested in understanding life through time--not just at one time in the past or present, but over long periods of past time. Before they can attempt to...

Phylogeny is the inferred evolutionary history of a group of organisms (including microorganisms). Paleontologists are interested in understanding life through time, not just at one time in the past or present, but over long periods of past time....

The evolutionary history of a species or group of related species is called its phylogeny. When the evolutionary history is diagrammed, it is shown in the shape of a tree that traces evolutionary relationships as they have changed over time. The...

The term phylogenetic (or phyletic) is used in reference to relationships among groups of organisms based on their shared evolutionary history (that is, on their phylogeny). One of the major goals of biological science (and of paleontology, the study...

The term phylogenetic (or phyletic) is used in reference to relationships among groups of organisms based on their shared evolutionary history (that is, on their phylogeny). One of the major goals of biological science (and of paleontology, the study...

Monophylogeny is a term used in the science of systematics to describe a group of organisms that are classified in the same taxon and share a common ancestor. The term monophylogeny comes from the Greek words mono meaning "one", phylon meaning "tribe"...

History of the evolution of a species or group, especially lines of descent and relationships among broad groups. The fundamental proposition is that plants or animals of different species descended from common ancestors. Because the evidence for such...

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In biology, phylogenetics (Greek: phyle = tribe, race and genetikos = relative to birth, from genesis = birth) is the study of evolutionary relatedness among various groups of organisms (e.g., species, populations). Also known as phylogenetic...