関: monophyletic

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Phylogenetic tree, the blue (left) and red (right) groups represent monophyletic groups, the green group (centre) being paraphyletic.

Cladogram of the primates, showing a monophyletic group (the simians, in yellow), a paraphyletic group (the prosimians, in blue, including the red patch), and a polyphyletic group (the night-active primates, the lorises and the tarsiers, in red)

Phylogenetic groups: A monophyletic taxon contains a common ancestor and all of its descendants. Diagram: in yellow, the group of "reptiles and birds". A paraphyletic taxon contains its most recent common ancestor, but does not contain all the descendants of that ancestor. Diagram: in cyan, the reptiles. A polyphyletic taxon does not contain the most recent common ancestor of all its members. Diagram: in red, the group of all warm-blooded animals is polyphyletic.

In common cladistic usage, a monophyletic group is a taxon (group of organisms) which forms a clade, meaning that it consists of an ancestral species and all its descendants. The term is synonymous with the uncommon term holophyly. Monophyletic groups are typically characterized by shared derived characteristics (synapomorphies).

Monophyly is contrasted with paraphyly and polyphyly, as shown in the second diagram. A paraphyletic group consists of all of the descendants of a common ancestor minus one or more monophyletic groups. Thus, a paraphyletic group is 'nearly' monophyletic (hence the prefix 'para', meaning 'near' or 'alongside'.) A polyphyletic group is characterized by convergent features or habits (for example, night-active primates, fruit trees, aquatic insects); the features by which the group is differentiated from others are not inherited from a common ancestor.

These definitions have taken some time to be accepted. When the cladistic school of thought became mainstream in the 1960s, several alternative definitions were in use. Indeed, taxonomists sometimes used terms without defining them, leading to confusion in the early literature,^[1] a confusion which persists.^[2]

Definitions

On the broadest scale, definitions fall into two groups.

Willi Hennig (1966:148) defined monophyly as groups based on synapomorphy (in contrast to paraphyletic groups, based on symplesiomorphy, and polyphyletic groups, based on convergence). Some authors have sought to define monophyly to include paraphyly as any two or more groups sharing a common ancestor.^[2]^[3]^[4]^[5] However, this broader definition encompasses both monophyletic and paraphyletic groups as defined above. Therefore, most scientists today restrict the term "monophyletic" to refer to groups consisting of all the descendants of one (hypothetical) common ancestor.^[1] However, when considering taxonomic groups such as genera and species, the most appropriate nature of their common ancestor is unclear. Assuming that it would be one individual or mating pair is unrealistic for sexually reproducing species, which are by definition interbreeding populations.^[6]

Monophyly and associated terms are restricted to discussions of taxa, and are not necessarily accurate when used to describe what Hennig called tokogenetic relationships—now referred to as genealogies. Some argue that using a broader definition, such as a species and all its descendants, does not really work to define a genus.^[6] According to D. M. Stamos, a satisfactory cladistic definition of a species or genus is impossible because many species (and even genera) may form by "budding" from an existing species, leaving the parent species paraphyletic; or the species or genera may be the result of hybrid speciation.^[7]

References

^ ^a ^b Hennig, Willi; Davis, D. (Translator); Zangerl, R. (Translator) (1999) [1966]. Phylogenetic Systematics (Illinois Reissue ed.). Board of Trustees of the University of Illinois. pp. 72–77. ISBN 0-252-06814-9.
^ ^a ^b Aubert, D. 2015. A formal analysis of phylogenetic terminology: Towards a reconsideration of the current paradigm in systematics. Phytoneuron 2015-66:1–54.
^ Colless, Donald H. (March 1972). "Monophyly". Systematic Zoology (Society of Systematic Biologists) 21 (1): 126–128. doi:10.2307/2412266. JSTOR 2412266.
^ Envall, Mats (2008). "On the difference between mono-, holo-, and paraphyletic groups: a consistent distinction of process and pattern". Biological Journal of the Linnean Society 94: 217. doi:10.1111/j.1095-8312.2008.00984.x.
^ Ashlock, Peter D. (March 1971). "Monophyly and Associated Terms". Systematic Zoology (Society of Systematic Biologists) 20 (1): 63–69. doi:10.2307/2412223. JSTOR 2412223.
^ ^a ^b Simpson, George (1961). Principles of Animal Taxonomy. New York: Columbia University Press. ISBN 0-231-02427-4.
^ Stamos, D.N. (2003). The species problem : biological species, ontology, and the metaphysics of biology. Lanham, Md. [u.a.]: Lexington Books. pp. 261–268. ISBN 0739105035.

External links

Abbey, Darren (1994–2006). "Graphical explanation of basic phylogenetic terms". University of California, Berkeley. Retrieved 15 January 2010.
Carr, Steven M. (2002). "Concepts of monophyly, polyphyly & paraphyly". Memorial University. Retrieved 15 January 2010.
Hyvönen, Jaako (2005). "Monophyly, consensus, compromise" (pdf). University of Helsinki. Retrieved 15 January 2010.

English Journal

Planthopper family Issidae (Insecta: Hemiptera: Fulgoromorpha): linking molecular phylogeny with classification.

Wang M1, Zhang Y2, Bourgoin T3.
Molecular phylogenetics and evolution.Mol Phylogenet Evol.2016 Dec;105:224-34. doi: 10.1016/j.ympev.2016.08.012. Epub 2016 Aug 21.
A molecular phylogeny of the planthopper family Issidae (Hemiptera, Fulgoroidea) is provided using both Maximum likelihood and Bayesian inference analyses. The phylogeny is based on 18S, two parts of 28S, COXI and Cytb genes from 50 genera and 79 ingroup species (including 8 species recently exclude
PMID 27554758

Diversification in vipers: Phylogenetic relationships, time of divergence and shifts in speciation rates.

Alencar LR1, Quental TB2, Grazziotin FG3, Alfaro ML4, Martins M5, Venzon M6, Zaher H7.
Molecular phylogenetics and evolution.Mol Phylogenet Evol.2016 Dec;105:50-62. doi: 10.1016/j.ympev.2016.07.029. Epub 2016 Jul 29.
Snakes of the cosmopolitan family Viperidae comprise around 329 venomous species showing a striking heterogeneity in species richness among lineages. While the subfamily Azemiopinae comprises only two species, 70% of all viper species are arranged in the subfamily Crotalinae or the "pit vipers". The
PMID 27480810

Parsing polyphyletic Pueraria: Delimiting distinct evolutionary lineages through phylogeny.

Egan AN1, Vatanparast M2, Cagle W3.
Molecular phylogenetics and evolution.Mol Phylogenet Evol.2016 Nov;104:44-59. doi: 10.1016/j.ympev.2016.08.001. Epub 2016 Aug 2.
Several taxonomic and phylogenetic studies have hypothesized polyphyly within Pueraria DC., a genus comprising 19 species (24 with varieties) including the highly invasive Pueraria montana var. lobata (Kudzu) introduced to the U.S.A. about 150years ago. Previous efforts to investigate monophyly of t
PMID 27495827