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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 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).
Monophyletic. Refers to a group of species that all have a single common ancestral species
Mucous-bag suspension feeder. Suspension feeder employing a sheet or bag of mucus to trap particles nonselectively
Mutualism. An interaction between two species in which both derive some benefit ...
~ groups Groups that contain an ancestor and all the descendants of that ancestor.
~ origin A group of organisms that evolved from a single ancestral type.
~, 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 presence or absence of a wing would be alternative character states.
The major ~ 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 ~ . That is, all plants evolved from one ancestral plant, all animals from one ancestral animal, and all fungi from one ancestral fungus.
A valid clade is ~, consisting of an ancestral species and all its descendents.
A species must be ~ and share one or more derived character. There are two meanings to ~ (de Queiroz and Donoghue 1988, Nelson 1989). The first defines a ~ group as all the descendants of a common ancestor and the ancestor.
The trees were considered validated if the foreign gene was ~ either with a single donor taxon or with multiple potential donor taxa and was not ~ with the metazoa.
A true clade is considered to be ~, or containing one (and only one) complete evolutionary grouping deriving from one common ancestor. When a named group is found to contain more than one evolutionary line, it is termed polyphyletic.
See also: What is the meaning of Organ, Evolution, Species, Animal, Biology?