Dictionary > Monophyletic

Monophyletic

Definition
adjective

Of, pertaining to, about, or describing that which descended from a single ancestral species

Supplement

The term is used to describe a phylum (or a group of taxa) in terms of evolutionary origin or phylogeny. Thus, the phrase “monophyletic group” pertains to a group of organisms (usually species) that are more closely related to each other than any other group. This, therefore, implies that they descended from a common ancestor. Typically, the monophyletic groups possess characteristics that they commonly share with one another as they inherited them from a common ancestor. Apomorphy (i.e. a derived trait) that is shared by two or more taxa and derived from the most recent common ancestor is referred to as synapomorphy. It is the basis used to define monophyly (i.e. a condition of being a clade). Synapomorphy identifies the most recent common ancestor of a monophyletic group in a cladogram (phylogenetic tree).

Other related terms are polyphyletic and paraphyletic. In particular, polyphyletic can be used to describe a group of organisms that descends from multiple ancestral lineages (thus, “poly”). Paraphyletic, in turn, is a term that may describe a group of organisms that does include some but not all of the descendants from the common ancestors. While monophyletic groups are based on synapomorphy, polyphyletic groups are based on convergence and paraphyletic groups,  in turn, are based on symplesiomorphy.

An example of a monophyletic group is one that is comprised of humans, apes, and new world monkeys, as they share the most common recent ancestral group, which is the old-world monkeys.

 

Compare:
polyphyletic
paraphyletic

See also:
• Phylogenetic
Taxonomy
Synapomorphy


You will also like...

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

The process of photosynthesis
Photosynthesis – Photolysis and Carbon Fixation

Photosynthesis is the process that plants undertake to create organic materials from carbon dioxide and water, with the ..

Pink Lotus plant on a pond
Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

Crossing Over and Genetic Diversity
Inheritance and Probability

Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

bryophyte - sporophyte and gametophyte
Meiosis and Alternation of Generations

Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..