Biology:Discoplastis
Discoplastis is a genus of euglenoid algae in the family Phacaceae.[1] The species of this genus are found in Europe, North America, South-east Asia and Australia.[1]
Discoplastis consists of solitary, free-living cells with one emergent flagellum. The cells have a flexible, spirally striated pellicle and are therefore capable of metaboly. When swimming, the cells are a variety of different but characteristic shapes (cylindrical, fusiform, hourglass-shaped, etc.). The posterior of the cell ends in a pointed, colorless cell. Within each cell there are numerous small, discoid chloroplast lacking pyrenoids. Cells have paramylon grains; the paramylon grains may be monomorphic (all small) or dimorphic (some large, some small).[2] As with other euglenoids, the cell has a reddish eyespot (stigma).[3]
Discoplastis can be distinguished by to the combination of small, discoid parietal chloroplasts without pyrenoids (a synapomorphy for the family Phacaceae), and its flexibility.[4] The similar genus Flexiglena is even more flexible, displaying metabolic movement even when swimming. It is also distinguished by having a large paramylon grain directly adjacent to the stigma.[2]
Molecular phylogenetics suggest the following relationships between species:[2]
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References
- ↑ 1.0 1.1 "Discoplastis R.E.Triemer, 2006" (in en). https://www.gbif.org/species/4893670.
- ↑ 2.0 2.1 2.2 Łukomska-Kowalczyk, Maja; Chaber, Katarzyna; Fells, Alicja; Milanowski, Rafał; Zakryś, Bożena; De Clerck, O. (2021). "Description of Flexiglena gen. nov. and new members of Discoplastis and Euglenaformis (Euglenida)". Journal of Phycology 57 (3): 766–779. doi:10.1111/jpy.13107. PMID 33205421. Bibcode: 2021JPcgy..57..766L.
- ↑ Triemer, Richard E.; Zakryś, Bożena (2014). "Chapter 10. Photosynthetic Euglenoids". Freshwater Algae of North America: Ecology and Classification (2 ed.). Elsevier Inc.. ISBN 978-0-12-385876-4.
- ↑ Kim, Jong Im; Shin, Woongghi; Triemer, Richard E. (2010). "Multigene analyses of photosynthetic euglenoids and new family, Phacaceae (Euglenales)". Journal of Phycology 46 (6): 1278–1287. doi:10.1111/j.1529-8817.2010.00910.x. Bibcode: 2010JPcgy..46.1278K.
Template:Discoba Wikidata ☰ Q25847520 entry
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