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If the lineages in the phylogenetic tree stand for species, a polytomy shows the simultaneous speciation of three or more species. [6] In particular situations, they may be common, for example when a species that has rapidly expanded its range or is highly panmictic undergoes peripatric speciation in different regions.
A nonoptimal cladogram will be selected if the program settles on a local minimum rather than the desired global minimum. [16] To help solve this problem, many cladogram algorithms use a simulated annealing approach to increase the likelihood that the selected cladogram is the optimal one. [17]
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Because cladograms are build by nesting {} templates within each other, larger cladograms can exceed the expansion depth allowed by the Wikimedia software. The cladogram on the right fails on the twentieth nested clade template. There are two methods to get around this limitation: the use of the {{clade sequential}} template and
Cladogram (a branching tree diagram) illustrating the relationships of organisms within groups of taxa known as clades. The vertical line stem at the base represents the last common ancestor . The blue and orange subgroups are clades, each defined by a common ancestor stem at the base of its respective subgroup branch .
The study of Oliveros et al (2009) covers all the 136 H&M4 (and Cracraft, 2014) families, plus seven others that they label as such in the figures and mention in the discussion of the supplementary materials (for a total 143 families in study).
Imaginary cladogram. [2] The yellow mask is a plesiomorphy for each living masked species, because it is ancestral. [2] It is also a symplesiomorphy for them. But for the four living species as a whole, it is an apomorphy because it is not ancestral for all of them. The yellow tail is a plesiomorphy and symplesiomorphy for all living species.
To fit images in the whitespace beside a cladogram with over 15 taxa a size below 90% is recommended, but sizes upwards that can be used to fill the cladogram across the whole article left-right. Boxing a cladogram can allow for it to be positioned in line with text, and onto specific sides of a page.