| Eutreptia | |
|---|---|
Scientific classification 
| |
| 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]
Description
[edit]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
[edit]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]
- Eutreptia globulifera Goor
- Eutreptia lanowii Steuer
- Eutreptia papillifera Péterfi
- Eutreptia pascheri Skvortsov
- Eutreptia pertyi Pringsheim
- Eutreptia pyrenoidifera Matvienko
- Eutreptia scotica Butcher
- Eutreptia thiophila Skuja
- Eutreptia viridis Perty
References
[edit]- ^ a b c d e f g h "Eutreptia Perty, 1852 :: Algaebase". www.algaebase.org. Retrieved 8 May 2025.
- ^ "Eutreptia Perty, 1852". www.gbif.org. Retrieved 21 January 2021.
- ^ a b 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.
- ^ a b c Starmach, K. (1983). "Euglenophyta – Eugleniny". Flora słodkowodna Polski [Freshwater flora of Poland] (in Polish). Vol. 3. Warszawa: Państwowe Wydawnictwo Naukowe. pp. [1]–594.
- ^ 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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