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Scientific classification e
Domain: Eukaryota
Kingdom: Protozoa
Subkingdom: Sarcomastigota
Order: Flagellata
Genus: Kiitoksia
N.Vørs, 1992[1]
Type species
Kiitoksia ystava
Vørs 1992

Kiitoksia is a genus of aquatic protist. The taxonomic position of the genus is still uncertain and it has not found a robust location in any subgroup.[3]

Two species are confidently known in the genus: Kiitoksia ystava and Kiitoksia kaloista. K. ystava was first discovered in Tvärminne in the Gulf of Finland. K. kaloista was discovered in Sombre Lake on Signy Island, near Antarctica. A third species, K. parva was transferred from the genus Clautriavia by Smith and Scoble [4]

The Kiitoksia species are single-celled organisms approximately 2-4 micrometres in size and round in shape. The species can be distinguished by their flagella: K. ystava has two flagella, one short and one long, while K. kaloista has one long flagellum.[3][5]


"Kiitoksia" is a Finnish word for "thanks". The phrase "kiitoksia, ystävä" means "thank you, friend", while "kiitoksia kaloista" means "thanks for the fish". The latter name is a reference to the Douglas Adams novel: So Long, and Thanks for All the Fish.[6]


  1. ^ Vørs (1992). "Kiitoksia". WoRMS - World Register of Marine Species. Retrieved 2013-07-11.
  2. ^ Wendy Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. ; searched on 15 August 2018.
  3. ^ a b Vørs, Naja (1992). "Heterotrophic Amoebae, Flagellates and Heliozoa from the Tvärminne Area, Gulf of Finland, in 1988–1990". Ophelia. 36 (1): 1–109. doi:10.1080/00785326.1992.10429930.
  4. ^ Cavalier-Smith, T. & Scoble, J. (2012). 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. 10.1016/j.ejop.2012.09.002.
  5. ^ Tong, S.; Vørs, N.; Patterson, D. J. (1997). "Heterotrophic flagellates, centrohelid heliozoa and filose amoebae from marine and freshwater sites in the Antarctic". Polar Biology. 18 (2): 91–106. doi:10.1007/s003000050163. S2CID 38034485.
  6. ^ Tong, S., Vørs, N. and Patterson, D.J. 1997. Heterotrophic flagellates, centrohelid heliozoa and filose amoebae from marine and freshwater sites in the Antarctic. Polar Biology, 18, 91–106 doi=10.1007/s003000050163| s2cid= 38034485
  • Tikhonenkov, D. V, Benthic heterotrophic flagellates from the Red Sea littoral (Gulf of Suez, Egypt). Zoologičeskij žurnal, 2009, vol. 88: (11), 1291–1297, INIST:22381706