Biology:Colacium

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Colacium is a genus of algae belonging to the family Euglenaceae.[1] It has two phases: a motile phase and a sessile phase, where it is found attached to other freshwater organisms.[2]

The genus has a cosmopolitan distribution.[1]

Description

Colacium is a single-celled or colonial organisms. Cells are small, about 20–40 μm, and are similar to that of Euglena, and are metabolic with parietal, lobed chloroplasts each with a pyrenoid, and monomorphic, small paramylon grains. In its typical sessile phase, the cells are attached to a substrate via a mucilaginous stalk or short pillow. Cells divide to form colonies where the cells are attached by branched, dendroidal stalks.[3]

Cells of Colacium can grow a flagella and become motile, escaping from the colony as a free-swimming cell.[3]

Species:[1]

  • Colacium arbuscula Stein, 1878
  • Colacium mucronatum Bourr. & Chadef.
  • Colacium sideropus Skuja
  • Colacium simplex Hub.-Pest.
  • Colacium steinii Kent
  • Colacium vesiculosum Ehrenberg, 1838

References

  1. 1.0 1.1 1.2 "Colacium Ehrenberg, 1834" (in en). https://www.gbif.org/species/3208318. 
  2. Rosowski, James R.; Kugrens, Paul (1973). "Observations on the euglenoid Colacium with special reference to the formation and morphology of attachment material". Journal of Phycology 9 (4): 370–383. doi:10.1111/j.1529-8817.1973.tb04110.x. 
  3. 3.0 3.1 Triemer, Richard E.; Zakryś, Bożena (2014). "Chapter 10. Photosynthetic Euglenoids". Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc.. ISBN 978-0-12-385876-4. 

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