163,425 species and infraspecific names are in the database, 22,770 images, 62,964 bibliographic items, 480,353 distributional records.

Cylindrospermopsis G.Seenayya & N.Subba Raju, 1972

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Aphanizomenonaceae

Holotype species: Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subba Raju

Original publication and holotype designation: Seenayya, G. & Subba Raju, N. (1972). On the ecology and systematic of the alga known as Anabaenopsis raciborskii (Wolosz.) Elenk. and a critical evaluation of the forms described under the genus Anabaenopsis. In: Papers submitted to the First International Symposium on Taxonomy and Biology of blue-green algae. (Desikachary, T.V. Eds), pp. 52-57. Madras:

Taxonomic status: currently regarded as a synonym of Raphidiopsis.

Most recent taxonomic treatment adopted: Aguilera, A., Berrendero Gómez, E., Kaštovský, J., Echenique, R.O. & Salerno, G.L. (2018). The polyphasic analysis of two native Raphidiopsis isolates supports the unification of the genera Raphidiopsis and Cylindrospermopsis (Nostocales, Cyanobacteria). Phycologia 57(2): 130-146.

Description: Filaments solitary, straight or screw-like coiled, free-floating, slightly narrowed to the both ends, without sheaths; trichomes isopolar (or secondary heteropolar transient stages), with slight constrictions or unconstricted at crosswalls, subsymmetric (according to the position of heterocytes and akinetes). Cells cylindrical, isodiametric or shorter or longer than wide, pale blue-green or yellowish, with aerotopes; end cells (before heterocyte formation) narrowed, conical, bluntly pointed. Heterocytes ovoid or conical, sometimes slightly curved, unipored, terminal; they develop from the terminal cells, which change into proheterocytes after asymmetrical cross division of the end cell in a young trichome. Akinetes oval to cylindrical with rounded ends, developing asymmetrically on a trichome, solitary or in short rows (up to three), slightly distant from the terminal heterocytes, rarely close to heterocytes. Cells divide crosswise (sometimes asymmetrically) and grow more or less into the original size before the next division. Without meristematic zones, all cells capable of dividing. Reproduction by trichome fragmentation and akinetes. All species planktonic in eutrophic aquatic basins (water blooms), commonly in tropical countries; more common A. raciborskii facultatively also in temperate zones during summer.

Information kindly contributed by J. Komárek but may now be outdated.

Numbers of names and species: There are 12 species names in the database at present, of which 2 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

References
Thomazeau, S., Houdan-Fourmont, A., Couté, A., Duval, C., Couloux, A., Rousseau, F. & Bernard, C. (2010). The contribution of sub-Saharan African strains to the phylogeny of cyanobacteria: focusing on the Nostacaceae (Nostocales, Cyanobacteria). Journal of Phycology 46(3): 564-579.

Komárek, J., Zapomelova, E. & Hindak, F. (2010). Cronbergia gen. nov., a new cyanobacterial genus (Cyanophyta) with a special strategy of heterocyte formation. Cryptogamie Algologie 31(3): 321-341.

Komárek, J., Kaštovský, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Created: 11 April 2002 by M.D. Guiry

Verified by: 03 April 2018 by Wendy Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43594

Citing AlgaeBase
Please cite this record as:
Wendy Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 27 September 2021.

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