Spirotaenia Explained

Spirotaenia is a genus of basal unicellular green algae that may be sister to the Chlorokybophyceae.[1] [2] It was previously considered to be part of the Zygnemataceae. It is sexually conjugating, a mode of reproduction that was previously only known in the Zygnemataceae/Mesotaeniaceae, the sister groups to the land plants. This is surprising, as Spirotaenia is much more basal. The conjugating process is substantially aberrant.[3] [4] Spirotaenia may actually be more than one distinct lineage which may not be closely related.[5]

Notes and References

  1. Gitzendanner. Matthew A.. Soltis. Pamela S.. Wong. Gane K.-S.. Ruhfel. Brad R.. Soltis. Douglas E.. 2018. Plastid phylogenomic analysis of green plants: A billion years of evolutionary history. American Journal of Botany. en. 105. 3. 291–301. 10.1002/ajb2.1048. 29603143. 0002-9122. free.
  2. https://bmcecolevol.biomedcentral.com/articles/10.1186/1471-2148-12-77 Hidden genetic diversity in the green alga Spirogyra (Zygnematophyceae, Streptophyta)
  3. Book: Brook, Alan J.. The Biology of Desmids. 1981. University of California Press. 9780520042810. en.
  4. Gontcharov. Andrey A.. Melkonian. Michael. 2004. Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons. Phycologia. en-US. 43. 1. 105–113. 10.2216/i0031-8884-43-1-105.1. 0031-8884. 10.1.1.539.2139. 51945556.
  5. COESEL. PETER. VANHOOF. ANDRÉ. MEESTERS. KOOS. 2017-12-01. Zygospore morphology in the conjugating green alga Spirotaenia diplohelica (Streptophyta, Zygnematophyceae, Mesotaeniaceae). Phytotaxa. en. 329. 3. 284. 10.11646/phytotaxa.329.3.10. 1179-3163.

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