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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.
Apr 28, 2023 · Our analyses of a concatenation of the 183 euArc proteins using a variety of phylogenetic models, including the protein structure partition model, and various controls for deep phylogeny artifacts strongly and consistently support an excavate root for the eukaryote tree of life.
- Diplomonads
- Parabasalids
- Euglenozoans
Among the Excavata are the diplomonads, which include the intestinal parasite, Giardia lamblia(Figure 1). Until recently, these protists were believed to lack mitochondria. Mitochondrial remnant organelles, called mitosomes, have since been identified in diplomonads, but although these mitosomes are essentially nonfunctional as respiratory organell...
A second Excavata subgroup, the parabasalids, are named for the parabasal apparatus, which consists of a Golgi complex associated with cytoskeletal fibers. Other cytoskeletal features include an axostyle, a bundle of fibers that runs the length of the cell and may even extend beyond it. Parabasalids move with flagella and membrane rippling, and the...
Euglenozoans includes parasites, heterotrophs, autotrophs, and mixotrophs, ranging in size from 10 to 500 µm. Euglenoids move through their aquatic habitats using two long flagella that guide them toward light sources sensed by a primitive ocular organ called an eyespot. The familiar genus, Euglena, encompasses some mixotrophic species that display...
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.
The excavates are a major assemblage of protists, often known as Excavata. The phylogenetic category Excavata contains a variety of free-living and symbiotic forms, and includes some important parasites of humans.
Apr 28, 2023 · We assembled a dataset of 183 eukaryotic proteins of archaeal ancestry to test this root. The resulting phylogeny identifies four lineages of eukaryotes currently classified as "Excavata" branching separately at the base of the tree.
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Are excavates protists?
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Do Excavata have mitochondria?
Protist Diversification. A.G.B. Simpson, Y. Eglit, in Encyclopedia of Evolutionary Biology, 2016. Excavata. Like Rhizaria, Excavata (Figures 5 (e)–5 (j)) are primarily a collection of protozoa, but also include a single group of secondary algae.
