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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 a 2012 molecular study, von Reumont et al. challenge the monophyly of Vericrustacea: they present four versions of Pancrustacea cladogram (figures 1–4), and in all four figures Remipedia is a sister group to Hexapoda, and Branchiopoda is a sister group to (Remipedia + Hexapoda). Thus, their data strongly suggest that Branchiopoda is more ...
Parareptilia ("near-reptiles") is an extinct subclass of basal sauropsids/reptiles, typically considered the sister taxon to Eureptilia (the group that likely contains all living reptiles and birds). Parareptiles first arose near the end of the Carboniferous period and achieved their highest diversity during the Permian period .
' flat animals ') [3] is a phylum of free-living (non-parasitic) marine invertebrates. [ 4 ] [ 5 ] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion , eating food by engulfment , reproducing by fission or budding , placozoans are described as "the simplest animals on Earth."
In the late 20th century, it was recognized that the order Thysanura was paraphyletic, thus the two suborders were each raised to the status of an independent monophyletic order, with Archaeognatha sister taxon to the Dicondylia, including the Zygentoma. [5] The order Archaeognatha is cosmopolitan; it includes roughly 500 species in two ...
The name Pseudosuchia was originally given to a group of superficially crocodile-like prehistoric reptiles from the Triassic period, but fell out of use in the late 20th century, especially after the name Crurotarsi was established in 1990 to label the clade (evolutionary grouping) of archosaurs encompassing most reptiles previously identified as pseudosuchians.
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.
Download as PDF; Printable version; In other projects Appearance. move to sidebar hide Phylogenetic taxonomy is defined as the classification of organisms on the ...