Closteriopsis

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Closteriopsis
Closteriopsis longissima.jpg
Closteriopsis longissima
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Division: Chlorophyta
Class: Trebouxiophyceae
Order: Chlorellales
Family: Chlorellaceae
Genus: Closteriopsis
Lemmermann, 1899
Type species
Closteriopsis longissima
(Lemmermann) Lemmermann [1]
Species

Closteriopsis is a genus of green algae in the family Chlorellaceae. [2] It is planktonic in freshwater habitats, and is widespread. [1]

Closteriopsis is currently placed in the family Chlorellaceae, based on molecular data, although it is similar in morphology to Selenastraceae and was formerly placed there. [3]

Description

Closteriopsis is a unicellular organism. Cells are 10–240 μm long and 1–6.5 μm wide, and are very long and narrow, either straight or curved with usually pointed tips. [1] Most sources describe Closteriopsis as lacking a mucilaginous envelope, although it has been documented in one species. [4] Cells have smooth cell walls, a single nucleus and a central or parietal, ribbon-like chloroplast with multiple pyrenoids arranged in a series. Reproduction occurs asexually by the formation of two to eight autospores, which form in a series and are released through the rupture of the parental cell wall. Flagellated stages and sexual reproduction have not been observed in this genus. [1]

Closteriopsis is similar to other narrow, spindle-shaped organisms such as Keratococcus , Schroederia and Monoraphidium , and differs from them in having multiple pyrenoids per chloroplast. [1] [4] It is also similar to some acicular species of Closterium (hence the name), from which it is distinguished by having only one chloroplast and reproducing by autospores. [5] Species are distinguished from each other based on chloroplast morphology and cell size and shape. [1]

References

  1. 1 2 3 4 5 6 Guiry, M.D.; Guiry, G.M. "Closteriopsis Lemmermann, 1899". AlgaeBase . University of Galway . Retrieved 2025-01-14.
  2. See the NCBI webpage on Closteriopsis. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information . Retrieved 2007-03-19.
  3. . doi:10.1017/S0967026201003304 (inactive 1 July 2025).{{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help)CS1 maint: DOI inactive as of July 2025 (link)
  4. 1 2 Stoyneva, M.P.; Gärtner, G.; Cocquyt, C.; Vyverman, V. (2005). "Closteriopsis petkovii - A new green algal species from Lake Tanganyika (Africa)". Phyton. 45 (1). Horn, Austria: 237–247.
  5. Bicudo, Carlos E. M.; Menezes, Mariângela (2006). Gêneros de Algas de Águas Continentais do Brasil: chave para identificação e descrições (2 ed.). RiMa Editora. p. 508. ISBN   857656064X.