153,875 species and infraspecific names are in the database, 21,014 images, 59,594 bibliographic items, 413,572 distributional records.

Arthrospira Sitzenberger ex Gomont, 1892

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Oscillatoriophycidae
Order Oscillatoriales
Family Microcoleaceae

Lectotype species: Arthrospira jenneri Stizenberger ex Gomont

Original publication:Gomont, M. (1892 '1893'). Monographie des Oscillariées (Nostocacées Homocystées). Deuxième partie. - Lyngbyées. Annales des Sciences Naturelles, Botanique, Série 7 16: 91-264, pls 1-7.
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Type designated in Gardner, N.L. (1932). The Myxophyceae of Porto Rico and the Virgin Islands. In: Scientific Survey of Porto Rico and the Virgin Islands. Volume VIII. Part 2. (Anon. Eds), pp. 249-311. New York: New York Academy of Sciences.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Description: Filaments unbranched, solitary and free-living (floating), or in mats which are microscopic or macroscopic, covering the substrate, more or less regularly screw-like and freely coiled along the whole length, with unchanged or continually changing (decreasing or increasing) width of screws; trichomes:spirals width ratio = (2.5)-5-(10). Sheaths usually missing, rarely facultatively developed, colorless, tube-like, joined to trichomes, opened at the ends, containing a single trichome. Trichomes isopolar, 3-10 _m wide, uniseriate, composed of cylindrical cells, constricted or not at the visible crosswalls, not attenuated or slightly attenuated towards the ends, motile (rotation). Cells without aerotopes or (in planktonic species) with aerotopes, more or less isodiametric or shorter than wide, sometimes granular and with condensed granules at the crosswalls; end cells widely rounded and usually with thickened outer cell walls or with calyptras (in developed trichomes); special perforation of cell walls (crosswalls and side walls; see in Guglielmi and Cohen-Bazire (1982); all species ?). Cell content pale or bright blue-green or olive-green; thylakoids situated perpendicularly and irregularly along the cell walls. No heterocytes or akinetes. Cell division cross-wise, perpendicular to the long axis of a trichome, daughter cells grow more or less to the original size before the next division. All except apical cells capable of division. Reproduction by fragmentation of trichomes into motile hormogonia, which separate with assistance from necrotic cells. Several species are benthic in freshwater biotopes; several are planktonic, mainly in tropical and saline (mineral) lakes and reservoirs. Important biotechnological organisms for mass culture (usually under the incorrect name Spirulina platensis). Few species are known from marine littoral biotopes.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 3 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 43 species names in the database at present, as well as 12 infraspecific names. Of the species names, 23 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
Whitton, B.A. (2002). Phylum Cyanophyta (Cyanobacteria). In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 25-122. Cambridge: Cambridge University Press.

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: 28 December 2000 by M.D. Guiry

Verified by: 03 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43076

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 December 2018.

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