Sagenista

For the insect genus, see Sagenista (wasp).

Sagenista
Aplanochytrium, a labyrinthulid
Scientific classification
Domain:	Eukaryota
Clade:	Sar
Clade:	Stramenopiles
Phylum:	Bigyra
Subphylum:	Sagenista Cavalier- Smith, 1995 [1] stat. n. 2006
Groups
Eogyrea Labyrinthulea

Sagenista is a subphylum 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. ^{[2] [3] [4] [5]}

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.^{[ citation needed ]}

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.^{[ citation needed ]}

There is a debate about whether some species of Sagenista contain the photosynthetic pigment chlorophyll C.^{[ citation needed ]}

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.^{[ citation needed ]}

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. ^{[6] [7]}

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.^{[ permanent dead link ]}
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 12 July 2025). Archived from the original (PDF) on 2016-06-04.
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.