網頁2024年2月19日 · Typically, the stem group diversifies rapidly until the crown group emerges, at which point its diversity collapses, followed shortly by its extinction. Mass … 網頁Phylogenomics of Fargesia and Yushania reveals a history of reticulate evolution Xia-Ying Ye, Peng-Fei Ma, Cen Guo, De-Zhu Li, Pages: 1183-1197 First Published: 14 January …

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網頁2024年7月14日 · The application of stem- and crown-group concepts assigned most of these weird forms to stem groups of a high-rank crown clade, e.g., a class, a phylum or a subkingdom (Budd and Jensen 2000). Most phylum-level clades of the Metazoa must have been present, at least as stem groups, by the time of the Chengjiang biota (~ 518 Ma), … 網頁Crown groups and stem groups are illustrated on the tree below. In phylogenetic terminology, a crown group is a clade defined by extant species. It consists of the most recent shared common ancestor of all extant members of a clade, as well as all of the descendants of that common ancestor, whether they are still living or are extinct. clear creek atv park milton

The dynamics of stem and crown groups Science Advances

網頁2024年4月13日 · The ancient co-occurrence of dental specializations for leaf eating, rather than ripe fruit consumption, along with ape-like locomotor abilities counters the predictions of the terminal branch forest frugivory hypotheses. The combined paleoecological evidence situates Morotopithecus in a woodland with a broken canopy and substantial grass … Placing fossils in their right order in a stem group allows the order of these acquisitions to be established, and thus the ecological and functional setting of the evolution of the major features of the group in question. Stem groups thus offer a route to integrate unique palaeontological data into questions of the evolution of living organisms. Furthermore, they show that fossils that were considered to lie in their own separate group because they did not show all the diagnostic featur… 網頁花的不同部分之间的花香在质量和数量上可能不同，而花内的这些空间香味模式可以被传粉者用来定位花。在这里，我们展示了雌雄异株 Silene latifolia（石竹科）花内空间香味模式 … clear creek assessor gis colo