160,199 species and infraspecific names are in the database, 22,604 images, 62,290 bibliographic items, 471,479 distributional records.

Tetradesmus G.M.Smith, 1913

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Chlorophyceae
Order Sphaeropleales
Family Scenedesmaceae

Holotype species: Tetradesmus wisconsinensis G.M.Smith

Original publication and holotype designation: Smith, G.M. (1913). Tetradesmus, a new four-celled coenobic alga. Bulletin of the Torrey Botanical Club 40: 75-87, 1 pl.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Wynne, M.J. & Hallan, J.K. (2016 '2015'). Reinstatement of Tetradesmus G. M. Smith (Sphaeropleales, Chlorophyta). Feddes Repertorium 126: 83-86.

Description: Thalli colonial, forming 4-celled coenobia not embedded in mucilaginous envelope. Cells fusiform to spherical in surface view with small space between cells. Cells 8-32 x 3-13.5 µm, elongated perpendicular to coenobial surface with 4 cells parallel and attached along lateral walls to two others. In side view, cells lunate to bent-cylindrical with pointed to blunt ends curving away from coenobium. Cell walls smooth. Cells uninucleate; chloroplasts single and parietal with single pyrenoid. Asexual reproduction by autospores; 2 or mostly 4 per sporangium and organized into coenobia. Daughter colonies released by longitudinal splitting of parental cell wall. Flagellated stages and sexual reproduction unknown.

Information contributed by: D. Garbary. The most recent alteration to this page was made on 2 Feb 2016 by M.D. Guiry.

Comments: Tetradesmus is planktonic in freshwater; most taxa reported from either Europe or North America, one form of T. wisconsinensis is also known from Asia and Africa.

Numbers of names and species: There are 26 species names in the database at present, as well as 9 infraspecific names. Of the species names, 14 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.

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: 02 February 2016 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43475

Citing AlgaeBase
Please cite this record as:
M.D. 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 06 March 2021.

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