What is the supergroup Excavata?
Excavata are a supergroup of protists that are defined by an asymmetrical appearance with a feeding groove that is “excavated” from one side; it includes various types of organisms which are parasitic, photosynthetic and heterotrophic predators.
What are the 4 protist supergroups?
Reproduction is generally by binary fission, and these organisms are facultative anaerobes. The Protists encompasses five supergroups, four of which contain parasites of human hosts: the Opisthokonta, the Amoebozoa, the Excavata, the Archaeplastida, and the SAR supergroups.
What are the four supergroups of eukarya?
The largest categories of eukaryotes have been defined, and they are called the eukaryotic supergroups. There are four of them presently, and so the eukaryotes can be divided into four groups. Here’s an introduction to the archaeplastida, SAR, excavata, and unikonts aka Amorphea.
What are the subgroups of Excavata?
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.
Is Excavata a phylum?
Excavata is a major supergroup of unicellular organisms belonging to the domain Eukaryota….Excavata.
| Excavata Temporal range: | |
|---|---|
| (unranked): | Excavata (Cavalier-Smith), 2002 |
| Phyla | |
| Discoba Tsukubea Discicristata Jakobea Loukozoa Metamonada Malawimonas Ancyromonadida |
What are the 6 supergroups in domain eukarya?
Nearly all of eukaryotic diversity has been classified into 6 suprakingdom-level groups (supergroups) based on molecular and morphological/cell-biological evidence; these are Opisthokonta, Amoebozoa, Archaeplastida, Rhizaria, Chromalveolata, and Excavata.
What are the supergroups?
The majority view at present is to order all eukaryotes into six supergroups: Excavata, Chromalveolata, Rhizaria, Archaeplastida, Amoebozoa, and Opisthokonta. The goal of this classification scheme is to create clusters of species that all are derived from a common ancestor.
Are Rhizaria unicellular or multicellular?
unicellular eukaryotes
The Rhizaria are a species-rich supergroup of mostly unicellular eukaryotes. Except for the Chlorarachniophytes and three species in the genus Paulinella in the phylum Cercozoa, they are all non-photosynthethic, but many foraminifera and radiolaria have a symbiotic relationship with unicellular algae.
How many flagella do Excavata have?
Most excavates have two, four, or more flagella. Many have a conspicuous ventral feeding groove with a characteristic ultrastructure, supported by microtubules—the “excavated” appearance of this groove giving the organisms their name.
What is Excavata?
Excavata is a major supergroup of unicellular organisms belonging to the domain Eukaryota. It was first suggested by Simpson and Patterson in 1999 and introduced by Thomas Cavalier-Smith in 2002 as a formal taxon.
What are the two major subclassifications of Rhizaria?
Two major subclassifications of Rhizaria include Forams and Radiolarians. Forams are characterized as unicellular heterotrophic protists that have porous shells, referred to as tests, which can contain photosynthetic algae that the foram can use as a nutrient source.
What is the phylum of Rhizaria?
The Rhizaria are an ill-defined but species-rich supergroup of mostly unicellular eukaryotes. Except for the Chlorarachniophytes and three species in the genus Paulinella in the phylum Cercozoa, they are all non-photosynthethic, but many foraminifera and radiolaria have a symbiotic relationship with unicellular algae.
Is Excavata unicellular or multicellular?
Excavata is a major supergroup of unicellular organisms belonging to the domain Eukaryota. Introduced by Thomas Cavalier-Smith in 2002 as a new phylogenetic category, it contains a variety of free-living and symbiotic forms, and also includes some important parasites of humans.