Chloromonas

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Chloromonas
Chloromonas miwae
Scientific classification Edit this classification
(unranked): Viridiplantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Chlamydomonadales
Family: Chlamydomonadaceae
Genus: Chloromonas
Gobi
Species
  • See text

Chloromonas is a genus of green algae in the family Chlamydomonadaceae.[1] It is closely related to the model green algae, Chlamydomonas, and traditionally has been distinguished mainly through the absence of a pyrenoid.[2]

Species of Chloromonas occupy a variety of habitats, including soil, temporary pools of fresh water and eutrophic lakes.[3] A number of species are adapted to living on snow, making them snow algae. The most northerly location at which this algae has been observed is Lake Bienville, Quebec, 55°N.[4]

Description

Chloromonas is a unicellular organism with cells that are ranging from spherical, ovoid, cylindrical, or spindle-shaped. There are two equal flagella on the anterior end of the cell, with or without a papilla. As single large chloroplast fills the cell, and may be cup-shaped and variously lobed. Chloroplasts lack pyrenoids. An eyespot is present in most species. There is a single nucleus typically embedded in the center of the cell.[3]

Reproduction in Chloromonas occurs asexually and sexually. Asexual reproduction is by cell division, forming two or four zoospores. Sexual reproduction in the genus is diverse and can be isogamous, anisogamous, or oogamous.[3]

Taxonomy

Traditionally, the genus Chloromonas has been defined morphologically as being a pyrenoid-less version of Chlamydomonas. Phylogenetically, the pyrenoid-less species are all found in a single clade, but there are also pyrenoid-bearing species within this clade, making the genus non-monophyletic. In 2001, as a first step towards revising the genus, Thomas Pröschold and colleagues emended the circumscription of Chloromonas to include all species of this clade.[5] However, this clade also includes species of Gloeomonas, and the name Gloeomonas has priority over Chloromonas.[6]

Species

References

  1. ^ See the NCBI webpage on Chloromonas. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
  2. ^ Nozaki, H; Onishi, K; Morita, E (October 2002). "Differences in pyrenoid morphology are correlated with differences in the rbcL genes of members of the Chloromonas lineage (Volvocales, Chlorophyceae)". Journal of Molecular Evolution. 55 (4): 414–430. Bibcode:2002JMolE..55..414N. doi:10.1007/s00239-002-2338-9. PMID 12355262. S2CID 19862929.
  3. ^ a b c Guiry, M.D.; Guiry, G.M. "Chloromonas". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2023-12-27.
  4. ^ Proceedings of the Annual Meeting - Eastern Snow Conference. Vol. 57, Part 2000. Eastern Snow Conference. p. 209.
  5. ^ Pröschold, T.; Marin, B.; Schlösser, U. G.; Melkonian, M. (2001). "Molecular Phylogeny and Taxonomic Revision of Chlamydomonas (Chlorophyta). I. Emendation of Chlamydomonas Ehrenberg and Chloromonas Gobi, and description of Oogamochlamys gen. nov. and Lobochlamys gen. nov". Protist. 152 (4): 265–300. doi:10.1078/1434-4610-00068. PMID 11822658.
  6. ^ Nakada, Takashi; Nozaki, Hisayoshi (2014). "Chapter 6. Flagellate 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.


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