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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.
Protostomia (/ ˌ p r oʊ t ə ˈ s t oʊ m i. ə /) is the clade of animals once thought to be characterized by the formation of the organism's mouth before its anus during embryonic development. This nature has since been discovered to be extremely variable among Protostomia's members, although the reverse is typically true of its sister ...
Synapsids are a clade of amniotes, that had one opening on the sides of the skull. The synapsids' sister clade are the sauropsids. They appeared in the Late Carboniferous, the same time as the first sauropsids. Subtaxon Therapsids include mammals
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 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.
sister: Amoebozoa Obazoa is a proposed sister clade of Amoebozoa (which together form Amorphea ). The term Obazoa is based on the OBA acronym for O pisthokonta , B reviatea , and A pusomonadidae , the group's three constituent clades .
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Sister Death (Spanish: Hermana Muerte) [1] is a 2023 Spanish supernatural horror film directed by Paco Plaza and written by Jorge Guerricaechevarría and Plaza which stars Aria Bedmar. A prequel to the 2017 film Verónica , the plot follows the paranormal experiences of a novice (Bedmar) enrolled as a teacher in a convent operating as a girls ...