153,593 species and infraspecific names are in the database, 20,980 images, 59,399 bibliographic items, 411,125 distributional records.

Merismopedia Meyen, 1839

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Synechococcophycidae
Order Synechococcales
Family Merismopediaceae

Holotype species: Merismopedia punctata Meyen

Currently accepted name for the type species: Merismopedia tranquilla (Ehrenberg) Trevisan

Original publication and holotype designation: Meyen, F.J.F. (1839). Neues system der pflanzen-physiologie. Dritter band. pp. i-x, 1-627, Plates X-XV. Berlin: Haude und Spenersche Buchandlung (S.J. Joseephy).
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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.

Taxonomic notes
Chroococcales (Thomazeau et al. 2011: 569, fig. 2). - (14 Feb 2012) - Wendy Guiry

Description: Unicellular-colonial; colonies free floating, microscopic, rarely (in several "large" species) macroscopically visible, usually table-like, flat or slightly waved, with cells situated in one plane, in rows more or less perpendicular one to another (sometimes 2 or 4 cells more or less in dublets or quadruplets), squared or rectangular when young, in later stages sometimes irregular or composed of smaller, clustered, table-like colonies; colonies with 4-16, but in several species to several hundreds of cells (up to 4000); mucilaginous envelope of colonies colorless, usually homogeneous, fine, diffluent at the margin, rarely limited, in few species with ferric precipitations; around cells sometimes own, colorless mucilaginous envelopes. Cells spherical or widely oval (before division), after division hemispherical, with homogeneous content, sometimes finely granular or with visible chromatoplasm, in several planktonic species one or more aerotopes per cell. Cell division in two planes in successive generations, perpendicular one to another and to the plane of a flat colony. Daughter cells shift slightly from one another, but they remain in perpendicular rows in a colony. Reproduction by the dissociation of colonies. Free floating in water or in metaphyton, detritus, among aquatic plants, usually in submerged biotopes with numerous water vegetation. Several small species are planktonic, several live in halophilic biotopes (seashores, saline swamps) or in thermal springs. Distribution worldwide, but several species have clearly ecologically and geographically limited areas of distribution. To this genus belongs evidently also "Low GC-cluster of Synechocystis", defined by Waterbury (1989; freshwater, with facultative gliding motility, forming flat sheets, photoautotroph, facultatively containing phycoerythrins in cells).

Information contributed by: J. Komárek. The most recent alteration to this page was made on 17 Jul 2018 by M.D. Guiry.

Numbers of names and species: There are 58 species names in the database at present, as well as 15 infraspecific names. Of the species names, 40 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
Komárek, J. (2003). Coccoid and colonial cyanobacteria. In: Freshwater Algae of North America. Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 59-116. Amsterdam Boston London New York Oxford Paris San Diego San Fransisco Singapore Sydney Tokyo: Academic Press.

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.

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: 17 July 2018 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43071

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 16 November 2018.

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