Sagenista

Sagenista is a group of heterokonts containing the labyrinthulids and Eogyrea, a class of yet uncultured protists. Originally, it contained the Labyrinthulids and bicosoecids. However at present the bicosoecids have been removed, and Eogyrea were added, in order to make the group monophyletic.[2][3][4][5]

Sagenista
A labyrinthulid
Scientific classification
Domain:
Eukaryota
(unranked):
SAR
Superphylum:
Heterokonta
(unranked):
Sagenista

Cavalier- Smith, 1995[1] stat. n. 2006
Groups

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 contains a photosynthetic pigment labeled 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 killed an entire species of Sea grass as well as some species, such as a particular snail that relies on the grass.

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.
  4. Sandra L. BALDAUF (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 2019-08-20).
  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.

Bibliography
  • Gelenter, Wendy, and Stowell, Larry J. "Progress in understanding rapid blight of cool-season turf." PACE Turfgrass Research Institute Public Edition 9 (2003): 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., and Short, Frederick T. "Impact of the wasting disease pathogen, Labyrinthula zosterae, on the photobiology of Zostera marina." Marine Ecology Progress Series 226 (2002): 265-271.
  • Regan, Casie. Vampire Scientists Study Sea Grass Slime Mold in Florida Bay. National Park Service.
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