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Opisthokont characteristics include synthesis of extracellular chitin in exoskeleton, cyst/spore wall, or cell wall of filamentous growth and hyphae; the extracellular digestion of substrates with osmotrophic absorption of nutrients; and other cell biosynthetic and metabolic pathways. Genera at the base of each clade are amoeboid and phagotrophic.
Many of the protist species classified into the supergroup Excavata are asymmetrical, single-celled organisms with a feeding groove “excavated” from one side. This supergroup includes heterotrophic predators, photosynthetic species, and parasites. Its subgroups are the diplomonads, parabasalids, and euglenozoans.
24 de ago. de 2022 · This relationship has stood the test of time, and now animals and fungi are members of Holozoa and Holomycota, respectively, which are the two major divisions of the eukaryotic supergroup...
8 de sept. de 2005 · The supergroup Opisthokonta is an important taxon that includes both multicellular organisms and their extant single-celled relatives. This grouping is strongly supported by all concatenated nuclear and mitochondrial phylogenies (e.g., Baldauf et al. 2000 ; Bapteste et al. 2001 ; Lang et al. 2002 ).
1 de ene. de 2020 · Opisthokonta remains a robust clade in modern phylogenies; however, it is nested within at least two larger taxa, Amorphea and Obazoa, that are frequently treated as supergroups instead. • Amoebozoa is also still a robust group, but now is often regarded as a member of the supergroup Amorphea.
17 de ago. de 2021 · Within the eukaryotic supergroup Opisthokonta, multicellularity evolved independently in Fungi and Metazoa from unicellular ancestors along their respective branches, Holomycota and Holozoa 1....
In its original form, this new tree of eukaryotes was an unrooted polytomy with six main stems, each representing a supergroup: Opisthokonta, Amoebozoa, Excavata, Archaeplastida, Rhizaria and Chromalveolata. All six of these supergroups emerged from a common point, and their order of divergence was mostly unknown.
