Koliella

Koliella
Koliella longiseta
Scientific classification Edit this classification
Clade: Viridiplantae
Division: Chlorophyta
Class: Trebouxiophyceae
Order: Prasiolales
Family: Koliellaceae
Genus: Koliella
Hindák
Type species
Koliella spiculiformis
(Vischer) Hindák[1]
Species

Koliella is a genus of green algae in the order Prasiolales.[2][3][4] Members of this genus are found in freshwater plankton, but some are also found on snow and ice.[5]

The genus name of Koliella is in honour of Erszébet (Elizabet) Kol (1897-1980), who was a Hungarian botanist (Mycology and Algology), who worked at the Hungarian National Museum in Budapest.[6]

The genus was circumscribed by František Hindák in Nova Hedwigia vol.6 (issues 1/2) on page 99 in 1963.

Description

Koliella consists of straight or curved spindle-shaped or needle-shaped cells. The apices may be rounded, obtuse, acute, or sharply pointed. Cells contain a single parietal chloroplast lining the inside of the cell, which may be straight or spiraled; a pyrenoid may be present or absent. Oil droplets are also present within the cell.[5]

Koliella reproduces vegetatively by cell division; cells usually detach after division, but may, but may occasionally be found in short chains. It is similar to a number of fusiform green algal genera, such as Monoraphidium, Ankistrodesmus, and Schroederia but the cell division is transverse, dividing into two shorter cells.[7] It also reproduces asexually by producing zoospores, which are biflagellate. Sexual reproduction occurs in this genus, and is oogamous, but not much details are known.[5]

Taxonomy

Koliella is similar to the genus Raphidonema, and is primarily distinguished from the latter genus in that its cells detach after division (while Raphidonema forms filaments of cells).[5] Some taxonomists suggest that the difference between the two genera is too small to warrant separation, and that Koliella should be considered a synonym of Raphidonema.[1] For example, filaments of Raphidonema often separate into single cells akin to Koliella when placed in a liquid medium.[8]

As currently defined, the genus Koliella is polyphyletic; the type species K. spiculiformis is closely related to Chlorella while other species (K. longiseta and K. sempervirens) appear to be more closely related to Stichococcus.[9]

References

  1. ^ a b Guiry, M.D.; Guiry, G.M. "Raphidonema". AlgaeBase. University of Galway. Retrieved 2024-12-01.
  2. ^ Guiry, M.D.; Guiry, G.M. "Koliella". AlgaeBase. University of Galway.
  3. ^ Katana, A.; Kwiatowski, J.; Spalik, K.; Zakryś, B.; Szalacha, E.; Szymańska, H. (2001). "Phylogenetic position of Koliella (Chlorophyta) as inferred from nuclear and chloroplast small subunit rDNA". Journal of Phycology. 37 (3): 443–451. doi:10.1046/j.1529-8817.2001.037003443.x. S2CID 84445729.
  4. ^ See the taxonomy in the UniProt web [1]
  5. ^ a b c d Shubert, Elliot; Gärtner, Georg (2014). "Chapter 7. Nonmotile Coccoid and Colonial Green Algae". 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.
  6. ^ Burkhardt, Lotte (2022). Eine Enzyklopädie zu eponymischen Pflanzennamen [Encyclopedia of eponymic plant names] (pdf) (in German). Berlin: Botanic Garden and Botanical Museum, Freie Universität Berlin. doi:10.3372/epolist2022. ISBN 978-3-946292-41-8. S2CID 246307410. Retrieved January 27, 2022.
  7. ^ Matthews, Robin A. (2016). "Freshwater Algae in Northwest Washington, Volume II, Chlorophyta and Rhodophyta". A Collection of Open Access Books and Monographs. Western Washington University. doi:10.25710/fctx-n773.
  8. ^ Yakimovich, Kurt M.; Gauthier, Nick P.G.; Engstrom, Casey B.; Leya, Thomas; Quarmby, Lynne M. (2021). "A Molecular Analysis of Microalgae from Around the Globe to Revise Raphidonema (Trebouxiophyceae, Chlorophyta)". Journal of Phycology. 57 (5): 1419–1432. Bibcode:2021JPcgy..57.1419Y. doi:10.1111/jpy.13183. PMID 33988850.
  9. ^ Katana, Agnieszka; Kwiatowski, Jan; Spalik, Krzysztof; Zakryś, Bożena; Szalacha, Elżbieta; Szymańska, Hanna (2001). "Phylogenetic position of Koliella (Chlorophyta) as inferred from nuclear and chloroplast small subunit rDNA". Journal of Phycology. 37 (3): 443–451. Bibcode:2001JPcgy..37..443K. doi:10.1046/j.1529-8817.2001.037003443.x.
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