Pseudopediastrum Explained

Pseudopediastrum is a genus of green algae in the family Hydrodictyaceae.[1] It is very common in freshwater regions throughout the world.[2]

Description

Pseudopediastrum forms flat colonies, termed coenobia, of cells in powers of two, usually four, eight, 16, or 32. Coenobia are disc-shaped in outline, and marginal cells are drawn out into two lobes or points. Cells have one chloroplast filling the cell, each with a single pyrenoid.[3] In most species, the cells are contiguous without gaps between them, but this is not always the case. Important identifying characteristics include cell shape and cell wall granulation.[4]

Taxonomy

In 2005, molecular phylogenetic analyses showed that Pediastrum sensu lato was paraphyletic with respect to Hydrodictyon. Therefore, Pediastrum was split up into several genera, including Pseudopediastrum.[5] However, the genus Pseudopediastrum is still not monophyletic, in particular the morphologically diverse species Pseudopediastrum boryanum. Therefore, the genus is still in need of a revision.[6]

Notes and References

  1. See the NCBI webpage on Pseudopediastrum. Data extracted from the Web site: NCBI taxonomy resources . . 2007-03-19.
  2. 10.1111/j.1529-8817.2010.00940.x . Molecular Phylogenetic Relationships in the Freshwater Family Hydrodictyaceae (Sphaeropleales, Chlorophyceae), with an Emphasis on Pediastrum duplex . 2011 . McManus . Hilary A. . Lewis . Louise A. . Journal of Phycology . 47 . 1 . 152–163 . 27021721 . 20549311 .
  3. Book: Gêneros de Algas de Águas Continentais do Brasil: chave para identificação e descrições . 2 . 2006 . Carlos E. M. . Bicudo . Mariângela . Menezes . RiMa Editora . 508 . 857656064X .
  4. 10.1111/jpy.13069 . Integrative Approach Helps Clarify Confusing Taxonomy of the Pseudopediastrum boryanum Species Complex (Chlorophyceae), Including Recognition of five Distinct Species . 2020 . Lenarczyk . Joanna . Saługa . Marta . Piątek . Jolanta . Journal of Phycology . 56 . 6 . 1557–1574 . 32920846 . 221672256 .
  5. 10.1111/j.1529-8817.2005.00129.x . Phylogeny of the Hydrodictyaceae (Chlorophyceae): Inferences from rDNA Data . 2005 . Buchheim . Mark . Buchheim . Julie . Carlson . Tracy . Braband . Anke . Hepperle . Dominik . Krienitz . Lothar . Wolf . Matthias . Hegewald . Eberhard . Journal of Phycology . 41 . 5 . 1039–1054 . 83698514 .
  6. 10.5507/fot.2018.004 . Evolutionary relationships between the varieties of green algae Pediastrum boryanum and P. duplex s.l. (Chlorophyceae, Hydrodictyaceae) . 2018 . Lenarczyk . Joanna . Saługa . Marta . Fottea . 18 . 2 . 170–188 . 91600165 . free .

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