Calkinsia

Calkinsia is a monotypic genus of excavates comprising the single species Calkinsia aureus.[2] It lives in low-oxygen seafloor environments.[1][3] It is not classified in any of the three well-known groups of the Euglenozoa (Kinetoplastida, Euglenida or Diplonemida), but is placed in its own group, the Symbiontida (along with some DNA sequences which were found in marine environments but not identified with known organisms).[1] Some authors have classified Calkinsia alongside Postgaardi, but Postgaardi has not been studied well enough to test this hypothesis.[1]

Calkinsia
Scientific classification
Domain:	Eukaryota
(unranked):	Excavata
Division:	Euglenozoa
Class:	Postgaardea[1]
Order:	Postgaardida
Family:	Calkinsiidae Cavalier-Smith 2016
Genus:	Calkinsia Lackey 1960 non Nieuwland 1916
Species
C. aureus Lackey 1960

References

1. Yubuki, N; Edgcomb, Vp; Bernhard, Jm; Leander, Bs (Jan 2009). "Ultrastructure and molecular phylogeny of Calkinsia aureus: cellular identity of a novel clade of deep-sea euglenozoans with epibiotic bacteria" (Free full text). BMC Microbiology. 9: 16. doi:10.1186/1471-2180-9-16. PMC 2656514. PMID 19173734.
2. Guiry, M.D.; Guiry, G.M. (2008). "Calkinsia". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-02-22.
3. Amend, Jan P.; Edwards, Katrina J.; Lyons, Timothy D. (2004). Sulfur biogeochemistry: past and present. Boulder, Colo.: Geological Society of America. ISBN 978-0-8137-2379-2.

Further reading

• Yubuki, Naoji; Simpson, Alastair; Leander, Brian (January 2013). "Reconstruction of the feeding apparatus in Postgaardi mariagerensis provides evidence for character evolution within the Symbiontida (Euglenozoa)". European Journal of Protistology. 49 (1): 32–39. doi:10.1016/j.ejop.2012.07.001. PMID 22925570.
• Lackey, James B. (1960). "Calkinsia aureus Gen. et sp. nov:, a New Marine Euglenid". Transactions of the American Microscopical Society. 79 (1): 105–107. doi:10.2307/3223980. JSTOR 3223980.