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The term sister group is used in phylogenetic analysis, however, only groups identified in the analysis are labeled as "sister groups".. An example is birds, whose commonly cited living sister group is the crocodiles, but that is true only when discussing extant organisms; [3] [4] when other, extinct groups are considered, the relationship between birds and crocodiles appears distant.
In terms of mtDNA, however, it appears that modern humans and Neanderthals form a sister clade, with Denisovans as basal outgroup. The split of Neanderthal and modern human mtDNA is dated to about 498–295 kya, i.e. significantly younger than the date estimated based on nuclear DNA.
The exact location the bones were recovered, is today unknown. [2] In 1993, ... being the sister taxon of a clade formed by Kholumolumo and Ledumahadi: [6]
The crown age of a clade refers to the age of the most recent common ancestor of all of the species in the clade. The stem age of a clade refers to the time that the ancestral lineage of the clade diverged from its sister clade. A clade's stem age is either the same as or older than its crown age. [15] Ages of clades cannot be directly observed.
Whether the Xenacoelomorpha clade is the sister group to the Ambulacraria remains a contentious issue, with some authors arguing that the former should be placed more basally among metazoans, [5] [6] [1] and other authors asserting that the best choices of phylogenetic methods support the position of Xenacoelomorpha as the sister group to ...
The clade Scrotifera is a sister group to the order Eulipotyphla (true insectivores) based on evidence from molecular phylogenetics, [1] and together they make superorder Laurasiatheria. The last common ancestor of Scrotifera is supposed to have diversified ca. 73.1 [ 3 ] to 85.5 [ 4 ] million years ago.
We're seeing double! Meet the Clements twins, Ava Marie and Leah Rose, who have been hailed as the "most beautiful twins in the world." The 8-year-old identical twins from Los Angeles have quickly ...
The Trochozoa are a proposed Lophotrochozoa clade that is a sister clade of Bryozoa and Platyzoa.The clade would include animals in five phyla: the Nemertea, the Annelida, the Mollusca, and the two Brachiozoan phyla, Brachiopoda and Phoronida.