Spirotaenia

Spirotaenia
	Spirotaenia condensata (28 × 208 µm)
Systematics
without rank:	Diaphoreticks
without rank:	Archaeplastida
without rank:	Chloroplastida
Department :	Chlorokybophyta
Genre :	Spirotaenia
Scientific name
	Spirotaenia
	Bréb. ex Ralfs

Spirotaenia is a genus of algae from the order of the ornamental algae and the family Mesotaeniaceae .

Spirotaenia is a genus of green algae that is apparently basal in the family tree of the Chloroplastida (also called Viridiplantae) and possibly a sister group of the Chlorokybophyceae . The genus was previously placed in the order of ornamental algae (Zygnemataceae). Sexual conjugation is observed, a type of reproduction that was previously only known in the ornamental algae and Mesotaeniaceae , the sister groups of land plants ( Embryophyta ). Surprisingly, it turned out that Spirotaenia is much more basal. In fact, there are significant differences in the conjugation process compared to the other groups mentioned.

description

Similar to the Mesotaeniaceae, the representatives of this genus are unicellular with a light microscopic structure- less cell wall . Because the differentiating features often only differ slightly from one another, a reliable determination is often only possible on the basis of the zygospores . Spirotaenia could actually be polyphyletic, i.e. H. consist of more than one particular lineage that are not closely related.

distribution

Commonly found in moderately to weakly acidic bog waters , peat cuttings , forests and meadow ditches. Some representatives live atmophytically on moist substrates such as earth, peat or rocks.

Types (selection)

proof

Rupert Lenzenweger: Desmidiac flora of Austria Part 4 , Bibliotheca Phycologica Volume 111, pages 24-27.

Individual evidence

↑ Matthew A. Gitzendanner, Pamela S. Soltis, Gane K.-S. Wong, Brad R. Ruhfel, Douglas E. Soltis: Plastid phylogenomic analysis of green plants: A billion years of evolutionary history . In: American Journal of Botany . 105, No. 3, 2018, ISSN 0002-9122 , pp. 291-301. doi : 10.1002 / ajb2.1048 . PMID 29603143 .
^ Alan J. Brook: The Biology of Desmids ( en ). University of California Press, 1981, ISBN 9780520042810 .
↑ Andrey A. Gontcharov, Michael Melkonian: Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons . In: Phycologia . 43, No. 1, 2004, ISSN 0031-8884 , pp. 105-113. doi : 10.2216 / i0031-8884-43-1-105.1 .
↑ Peter Coesel, André Vanhoof, Koos Meesters: Zygospore morphology in the conjugating green alga Spirotaenia diplohelica (Streptophyta, Zygnematophyceae, Mesotaeniaceae) . In: Phytotaxa . 329, No. 3, December 1, 2017, ISSN 1179-3163 , p. 284. doi : 10.11646 / phytotaxa.329.3.10 .

Web links

Commons : Spirotaenia - collection of images, videos and audio files

Pictures of representatives of the genus Spirotaenia

[1] Matthew A. Gitzendanner, Pamela S. Soltis, Gane K.-S. Wong, Brad R. Ruhfel, Douglas E. Soltis: Plastid phylogenomic analysis of green plants: A billion years of evolutionary history . In: American Journal of Botany . 105, No. 3, 2018, ISSN 0002-9122 , pp. 291-301. doi : 10.1002 / ajb2.1048 . PMID 29603143 .

[2] Alan J. Brook: The Biology of Desmids ( en ). University of California Press, 1981, ISBN 9780520042810 .

[3] Andrey A. Gontcharov, Michael Melkonian: Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons . In: Phycologia . 43, No. 1, 2004, ISSN 0031-8884 , pp. 105-113. doi : 10.2216 / i0031-8884-43-1-105.1 .

[4] Peter Coesel, André Vanhoof, Koos Meesters: Zygospore morphology in the conjugating green alga Spirotaenia diplohelica (Streptophyta, Zygnematophyceae, Mesotaeniaceae) . In: Phytotaxa . 329, No. 3, December 1, 2017, ISSN 1179-3163 , p. 284. doi : 10.11646 / phytotaxa.329.3.10 .