Eutreptia

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Eutreptia
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Clade: Discoba
Phylum: Euglenozoa
Class: Euglenida
Clade: Euglenophyceae
Order: Eutreptiales
Family: Eutreptiaceae
Genus: Eutreptia
Perty, 1852 [1]
Type species
Eutreptia viridis
Perty [1]

Eutreptia is a genus of Euglenozoa belonging to the family Eutreptiaceae (Eutreptiidae). [1] The genus was first described by Maximilian Perty in 1852. [1] It has a cosmopolitan distribution, [2] and is most commonly found in marine or brackish waters; [1] however, some species have also been reported from freshwater. [3]

Contents

Description

Eutreptia consists of single, free-swimming cells that are spindle-shaped with pronounced euglenoid movement (metaboly). Two heterodynamic flagella are present, both highly active while swimming, with a reddish eyespot near the base. Eutreptia is photosynthetic with green chloroplasts; there may be numerous discoid or ribbon-shaped chloroplasts, often radiating from central pyrenoids surrounded by grains of paramylon. [1] The chloroplast structure is similar to that of Euglena viridis , but in Eutreptia what appears to be a stellate chloroplast actually consists complex of ribbon-shaped chloroplasts each with a terminal pyrenoid. [3] While swimming, it rotates along the longitudinal axis; sometimes the cells creep along a substrate (in mucus). [4]

Reproduction occurs through longitudinal cell division. [4] It sometimes forms a palmelloid stage in which cells divide repeatedly. [1]

Taxonomy

Eutreptia is distinguished from the related genus Eutreptiella in that the two flagella are of nearly equal length, while Eutreptia has flagella of markedly unequal lengths. [5]

Species are distinguished based on the size and shape of cells, length of flagella, and presence of pyrenoids. [4]

Species: [1]

References

  1. 1 2 3 4 5 6 7 8 "Eutreptia Perty, 1852 :: Algaebase". www.algaebase.org. Retrieved 8 May 2025.
  2. ↑ "Eutreptia Perty, 1852". www.gbif.org. Retrieved 21 January 2021.
  3. 1 2 Triemer, Richard E.; Zakryś, Bożena (2014). "Chapter 10. Photosynthetic Euglenoids". In Wehr, John D.; Sheath, Robert G.; Kociolek, J. Patrick (eds.). Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc. ISBN   978-0-12-385876-4.
  4. 1 2 3 Starmach, K. (1983). "Euglenophyta – Eugleniny". Flora słodkowodna Polski [Freshwater flora of Poland] (in Polish). Vol. 3. Warszawa: Państwowe Wydawnictwo Naukowe. pp. [1]–594.
  5. ↑ Xu, Na; Pang, Shaojun; Shan, Tifeng; Liu, Feng; Zhao, Xiaobo; Gao, Suqin (2012). "Molecular identification and culture trials of Eutreptiella gymnastica (Eutreptiales, Euglenophyceae)". Chinese Journal of Oceanology and Limnology. 30 (3): 446–455. Bibcode:2012ChJOL..30..446X. doi:10.1007/s00343-012-1111-1.


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