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Sagenista
Aplanochytrium, a labyrinthulid
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	SAR
Clade:	Stramenopiles
Phylum:	Bigyra
Subphylum:	Sagenista Cavalier- Smith, 1995 stat. n. 2006
Groups
Eogyrea Cavalier-Smith 2013 Labyrinthulea (Lister 1891) Olive 1975 ex Cavalier-Smith 1986

Sagenista is a group of heterokonts containing the labyrinthulids and Eogyrea, a class of yet uncultured protists. Originally, it contained the Labyrinthulids and bicosoecids. The bicosoecids have been removed, and Eogyrea were added, in order to make the group monophyletic.

Some have a special organelle called a bothrosome (or sagenogenetosome). It is usually found in a marine environments rich in algae and sea grass. It is capable of movement by use of this organelle.

They are generally decomposers. They are cultivated for their active production of Omega-3 fatty acids. These acids are used as an approved additive for animal feed.

There is a debate about whether some species of Sagenista contain the photosynthetic pigment chlorophyll C.

Bothrosome

They are capable of excreting an extoplasmic net of filaments for cells to glide upon. These tiny filaments provide a network for cells to travel upon to soak up nutrients from the surrounding environment.

Examples

• Labyrinthula: Possesses a bothrosome. It is being studied for its pathogenic nature in marine environments. It has caused wasting disease in eelgrass, Zostera marina.

References

1. Cavalier-Smith, T. (1995). Membrane heredity, symbiogenesis, and the multiple origins of algae. In: Arai, R., Kato, M., Doi, Y. (eds). Biodiversity and evolution. The National Science Museum Foundation. Tokyo, pp 75-114.
2. "Browse taxonomic tree". Catalogue of Life : 2008 Annual Checklist.
3. Cavalier-Smith, T.; Chao, Ema E.-Y. (2006). "Phylogeny and megasystematics of phagotrophic heterokonts (kingdom Chromista)". Journal of Molecular Evolution. 62 (4): 388–420. Bibcode:2006JMolE..62..388C. doi:10.1007/s00239-004-0353-8. PMID 16557340. S2CID 29567514.
4. Baldauf, Sandra L. (2008). "An overview of the phylogeny and diversity of eukaryotes" (PDF). Journal of Systematics and Evolution. 46 (3): 263–273. doi:10.3724/SP.J.1002.2008.08060 (inactive 1 November 2024). Archived from the original (PDF) on 2016-06-04.{{cite journal}}: CS1 maint: DOI inactive as of November 2024 (link)
5. Cavalier-Smith, T.; Scoble, J. M. (2013). "Phylogeny of Heterokonta: Incisomonas marina, a uniciliate gliding opalozoan related to Solenicola (Nanomonadea), and evidence that Actinophryida evolved from raphidophytes". European Journal of Protistology. 49 (3): 328–353. doi:10.1016/j.ejop.2012.09.002. PMID 23219323.
6. Muehlstein, Lisa K.; Porter, David; Short, Frederick T. (1 January 1991). "Labyrinthula zosterae sp. nov., the Causative Agent of Wasting Disease of Eelgrass, Zostera marina". Mycologia. 83 (2): 180–191. doi:10.2307/3759933. JSTOR 3759933.
7. Ralph & Short 2002.

Bibliography

• Gelenter, Wendy; Stowell, Larry J (2003). "Progress in understanding rapid blight of cool-season turf". PACE Turfgrass Research Institute Public Edition. 9: 1–4.
• General Mycology. Dept. of Plant Biology, Washington State University.
• Introduction to the Sagenista. Museum of Paleontology, UC-Berkeley.
• Labyrinthulomycota. Department of Plant Biology, University of Georgia.
• Ralph, Peter J.; Short, Frederick T. (2002). "Impact of the wasting disease pathogen, Labyrinthula zosterae, on the photobiology of Zostera marina". Marine Ecology Progress Series. 226: 265–271. doi:10.3354/meps226265.
• Regan, Casie. Vampire Scientists Study Sea Grass Slime Mold in Florida Bay. National Park Service.

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