Excavate
The excavata are one of the six groups of eukaryotes, ie organisms with cell nuclei, which, inter alia, in the scheme of eukaryotes from Adl 2005 's. They include only single-celled organisms that have flagella without exception. Within the Euglenozoa there are forms with chloroplasts, which operate according to photosynthesis.
Features
The name derives from the unicellular excavata is the typical shaped cell mouth ( cytostome ) with a pronounced mouth pit ( " excavater " type), which is present in most species. This can, however, also have been reduced secondary again. The oral pit is used by most species to capture food particles and incorporated into the cell by phagocytosis.
The Euglenozoa possess Stammartmuster chloroplasts and are thus capable only group within the excavata for photosynthesis. The chloroplasts were reduced, however, in a number of taxa with a parasitic way of life again.
System
Et al Adl divided into seven groups without the excavata classic ranks.
- Fornicata
- Malawi Monas
- Parabasalia
- Preaxostyla
- Jakobida
- Heterolobosea
- Euglenozoa
Independent molecular genetic studies revealed in 2008 that the genus Stephanopogon that was performed long as in insecure position in the eukaryotes, the sister taxon of the genus Percolomonas (at Adl still Vahlkampfiidae ). The clade formed by the two genera in turn is the sister taxon of Heterolobosea. According to Cavalier- Smith, the two clades in their entirety, the so-called Percolozoa as a sister of Euglenozoa. ,