Calkinsia Explained

Calkinsia is a monotypic genus of excavates comprising the single species Calkinsia aureus.^[1] It lives in low-oxygen seafloor environments.^{[2] [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).^{[2] [4] [5]} Some authors have classified Calkinsia alongside Postgaardi, but Postgaardi has not been studied well enough to test this hypothesis.^[2]

The genus name of Calkinsia is in honour of Gary Nathan Calkins (1869 – 1943), who was an American protozoologist and a professor at Columbia University. He wrote several landmark textbooks on the biology of the protozoa.^[6]

Further reading

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

Notes and References

1. Web site: Guiry. M.D.. Guiry. G.M.. 2008. Calkinsia. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. 2009-02-22.
2. 2656514 . 10.1186/1471-2180-9-16 . Jan 2009 . Yubuki, N . Edgcomb, Vp . Bernhard, Jm . Leander, Bs . Ultrastructure and molecular phylogeny of Calkinsia aureus: cellular identity of a novel clade of deep-sea euglenozoans with epibiotic bacteria . 9. 16. 19173734 . BMC Microbiology . Free full text . free .
3. Book: Amend, Jan P. . Edwards, Katrina J. . Lyons, Timothy D. . Sulfur biogeochemistry: past and present . 2004 . Geological Society of America . Boulder, Colo. . 978-0-8137-2379-2 .
4. Yubuki . Naoji . Leander . Brian S. . Diversity and Evolutionary History of the Symbiontida (Euglenozoa) . Frontiers in Ecology and Evolution . 18 July 2018 . 6 . 100 . 10.3389/fevo.2018.00100 . free .
5. Kostygov . Alexei Y. . Karnkowska . Anna . Votýpka . Jan . Tashyreva . Daria . Maciszewski . Kacper . Yurchenko . Vyacheslav . Lukeš . Julius . Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses . Open Biology . 10 March 2021 . 11 . 3: 200407 . 200407 . 10.1098/rsob.200407 . 33715388 . 2046-2441 . 8061765.
6. Book: Burkhardt, Lotte . Eine Enzyklopädie zu eponymischen Pflanzennamen . Encyclopedia of eponymic plant names . Botanic Garden and Botanical Museum, Freie Universität Berlin . 2022 . 978-3-946292-41-8 . pdf . German . Berlin . 10.3372/epolist2022 . 246307410 . January 27, 2022.