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Fottea 8(1): 1-14, 2008 | DOI: 10.5507/fot.2008.001

Planktic morphospecies of the cyanobacterial genus Anabaena = subg. Dolichospermum - 2. part: straight types.

Jiří Komárek1,3, Eliška Zapomělová2,3
1 Institute of Botany Academy of Science of the Czech Republic, Dukelská 135, CZ-37982 Třeboň, Czech Republic
2 Biology centre of the Academy of Sciences of the Czech Republic, Institute of Hydrobiology, Na sádkách 7, CZ-37005 České Budějovice, Czech Republic
3 Faculty of Science, University of South Bohemia, Branišovská 31, CZ-37005 České Budějovice, Czech Republic

This small tropical cyanobacterial group, containing Anabaena volzii Lemmermann and a few related species (A. fuellebornii SCHMIDLE, A. unispora GARDNER, A. mysorensis GONZALVES & KAMAT), differs substantially phenotypically from all other planktic or benthic Anabaena types, mainly by the subsymmetric structure of the trichomes, type of akinete formation and restricted ecology. The taxonomic uniformity of all other Anabaenalike clusters (typical benthic Anabaena, planktic Anabaena subg. Dolichospermum, Trichormus, Aphanizomenon, Cuspidothrix) was already supported by molecular analyses. All of them also have their typical morphological markers, which are clearly different from the "Anabaena volzii - cluster". Therefore, this group can not be classified in any of the mentioned revised genera and must be described as a separate generic entity of heterocytous cyanobacteria (although they have not been sequenced to date). The new genus Macrospermum is therefore defined in my article with 4 related, morphologically distinguishable species. The generic name is selected according to the unusually large akinetes.

Keywords: Cyanobacteria, Anabaena, Dolichospermum, taxonomy, identification, morphology, variability, morphospecies, phytoplankton, straight trichomes

Received: December 31, 2007; Accepted: February 15, 2008; Published: March 1, 2008  Show citation

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Komárek, J., & Zapomělová, E. (2008). Planktic morphospecies of the cyanobacterial genus Anabaena = subg. Dolichospermum - 2. part: straight types. Fottea, 8(1), 1-14. doi: 10.5507/fot.2008.001
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