Biology:Pteromonas
Pteromonas is a genus of green algae in the family Phacotaceae.[1] It has a cosmopolitan distribution,[2] and mainly occurs in nutrient-rich freshwaters.[3]
Pteromonas is a unicellular, motile organism with two flagella; the protoplast of the cell is contained in a transparent,[4] flattened shell called a lorica. The two flagella emerge from separate openings in the anterior of the lorica. The lorica consists of two equal parts pressed together at their margins, forming a keel. The lorica is variously shaped, and may be undulate or spiny. The protoplast is pyriform, ovoid or globose and compressed. Cells contain a cup-shaped chloroplast with one or more pyrenoids and usually an stigma. Two contractile vacuoles are present at the base of the flagella. [2]
Asexual reproduction involves the division of the protoplast into two or four daughter cells, which are released when the two halves of the lorica separate. Sexual reproduction is isogamous; the two gametes fuse and develop into a globose zygote with a smooth cell wall.[2]
Species are distinguished based on the general morphology (size, shape and placement of "wings") of the lorica, and number and position of pyrenoids.[2]
References
- ↑ See the NCBI webpage on Pteromonas. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. https://ftp.ncbi.nih.gov/pub/taxonomy/.
- ↑ 2.0 2.1 2.2 2.3 Guiry, M.D.; Guiry, G.M. (2008). "". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org/browse/taxonomy/?id=43460.
- ↑ John, David M.; Whitton, Brian A.; Brook, Alan J. (2021). The Freshwater Algal Flora of the British Isles (2 ed.). Cambridge University Press. pp. 896. doi:10.1017/CHOL9781108784122. ISBN 978-1-108-78412-2.
- ↑ Nakada, Takashi; Nozaki, Hisayoshi (2014). "Chapter 6. Flagellate Green Algae". Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc.. pp. 265–313. ISBN 978-0-12-385876-4.
Wikidata ☰ Q7256824 entry
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