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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.
Bolidophyceae is the sister taxon to the diatoms (Bacillariophyceae). They lack the characteristic theca of the diatoms, [ 5 ] and have been proposed as an intermediate group between the diatoms and all other heterokonts.
Galagos are currently grouped into six genera. Euoticus is a basal sister taxon to all the other galagids. [4] The 'dwarf' galagids recently grouped under the genus Galagoides have been found, based on genetic data, and supported by analysis of vocalisations and morphology, to actually consist of two clades, which are not sister taxa, in eastern and western/central Africa (separated by the ...
Pleistoannelida is a group of annelid worms that comprises the vast majority of the diversity in phylum Annelida.Discovered through phylogenetic analyses, it is the largest clade of annelids, comprised by the last common ancestor of the highly diverse sister groups Errantia and Sedentaria (Clitellata and related polychaetes) and all the descendants of that ancestor.
For example, if we consider the crown-birds (i.e. all extant birds and the rest of the family tree back to their most recent common ancestor), extinct side branches like the dodo or great auk are still descended from the most recent common ancestor of all living birds, so fall within the bird crown group. [4]
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 ...
Kaley Cuoco stepped out with her sister this week, and we can't get over how much they look alike. The former "Big Bang Theory" actress has been loving life since her CBS sitcom came to an end ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 December 2024. Extinct clade of dinosaurs Ceratosaurs Temporal range: Sinemurian - Maastrichtian, 199.3–66 Ma Pre๊ ๊ O S D C P T J K Pg N Six ceratosaurs (top left to bottom right): Rugops, Elaphrosaurus, Majungasaurus, Carnotaurus, Ceratosaurus, Berthasaura Scientific classification Domain ...