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monophyletic -- Term applied to a group of organisms which includes the most recent common ancestor of all of its members and all of the descendants of that most recent common ancestor. A monophyletic group is called a clade. More?
monophyletic group A group of organisms descended from a common ancestor. For example: your immediate family may be considered such a group, being descended from a common ancestral group (grandparents, etc.).
Monophyletic: Refers to a group of species that all have a single common ancestral species.
Morphology: The form and structure of an organism, in particular its outside features.
Monophyletic group (clade): Evolutionary assemblage of taxa that includes a common ancestor and all of its descendants. [See Avise, p. 36].
MRCA: Most recent common ancestor.
 Monophyletic groups encouraged
Many cladists discourage the use of paraphyletic groups because they detract from cladisitcs' emphasis on clades (monophyletic groups).
(16) Monophyletic taxon (clade)
(a) The goal of systematics is to define monophyletic taxa (a.k.a., clades)
(b) A monophyletic taxon is one that includes the common ancestor species as well as all descendant species ...
monophyletic groups Groups that contain an ancestor and all the descendants of that ancestor.
monophyletic origin A group of organisms that evolved from a single ancestral type.
Monophyletic, paraphyletic, and polyphyletic trees
Taxonomists following cladistic analysis place taxa into clades based on the derived character states that the taxa share. For example, a wing is a character.
The major monophyletic subterranean Leptoridini lineages are geographically structured in the mountain massifs of the Iberian Peninsula and the deduced associated divergence times reveal ancient divisions (Figure 1b).
Other eukaryotic kingdoms—the Plantae, Fungi, and Animalia—are each believed to be monophyletic . That is, all plants evolved from one ancestral plant, all animals from one ancestral animal, and all fungi from one ancestral fungus.
A species must be monophyletic and share one or more derived character. There are two meanings to monophyletic (de Queiroz and Donoghue 1988, Nelson 1989).
See also: Organ, Evolution, Animal, Species, Animals