Gymnosphaerida
| Gymnosphaerida | ||||||||||||
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| Scientific name | ||||||||||||
| Gymnosphaerida | ||||||||||||
| Poche , 1913 | ||||||||||||
The Gymnosphaerida are a group of heterotrophic protists that have long been systematically regarded as sun animals .
features
The Gymnosphaerida are single-celled organisms. Their inner structure, the axonemes, consist of irregularly hexagonally arranged microtubules. They start from a central amorphous point. They have one or more cell nuclei . They have a bare cell surface or are covered with silicate spines. The cells can be differentiated into stem and head. They have extrusomes , including kinetocysts . Your mitochondria have tubular cristae.
They can be attached to the substrate with the cytoplasmic stalk. They can also swim freely as amoeboid or two-flagellated cells. Their complex life cycle is unknown.
Systematics
The Gymnosphaerida have long been associated with the sun animals (Heliozoa), which, however, are not naturally related.
They consist of three monotypical genera:
Adl et al. still represent the genera Actinolophus and Wagnerella as incertae sedis to the Gymnosphaerida.
supporting documents
- Sina M. Adl et al .: The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. The Journal of Eukaryotic Microbiology, Vol. 52, 2005, pp. 399-451. doi : 10.1111 / j.1550-7408.2005.00053.x .
- David J. Patterson: The Diversity of Eukaryotes . The American Naturalist, Vol. 65, Supplement, 1999, pp. 96-124.