Cafeteria roenbergensis
Scientific classification
Domain: Eukaryota
(unranked): SAR
Superphylum: Heterokonta
(unranked): Sagenista
Cavalier- Smith, 1995[1] stat. n. 2006
  • Eogyrea Cavalier-Smith 2013
  • Labyrinthulea (Lister 1891) Olive 1975 ex Cavalier-Smith 1986

Sagenista is a group of heterokonts which at one time contained the bicosoecids[2] and the slime nets Labyrinthulids.[3] However at present the bicosoecids have been removed in order to make the group monophyletic, also a new group (class Eogyrea) of as yet uncultured protists were added as sister to the Labyrinthulids.[4][5]

It has a special organelle called a Bothrosome. 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 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.

Uses of Sagenista and Labyrinthulomycota

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


Other information

Until recently Sagenista was labeled as a fungus. It produces asexually and sexually through the use of spores.

There is a debate about whether some species of Sagenista contains a photosynthetic pigment labeled chlorophyll C.


  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. 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 2015-01-09).
  4. Cavalier-Smith, T.; Chao, Ema E.-Y. (2006). "Phylogeny and megasystematics of phagotrophic heterokonts (kingdom Chromista)". Journal of Molecular Evolution. pp. 388–420. doi:10.1007/s00239-004-0353-8. PMID 16557340.
  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. pp. 328–353. doi:10.1016/j.ejop.2012.09.002.


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