155,256 species and infraspecific names are in the database, 21,864 images, 60,045 bibliographic items, 435,064 distributional records.

Pseudotetracystis R.D.Arneson, 1973

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

Holotype species: Pseudotetracystis terrestris Arneson

Original publication and holotype designation: Arneson, R.D. (1973). Pseudotetracystis, a new chlorosarcinacean alga. Journal of Phycology 9: 10-14.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Sphaeropleales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 280-355. Ruggell: A.R.A. Gantner Verlag K.-G..

Description: Thalli unicellular or consisting of diads or planar or tetrahedral tetrads; several generations of cells often forming irregular cell masses without gelatinous matrix. Thalli become multicellular through vegetative cell division (desmoschisis); cells often dissociating with age. Cells spherical to 16-20 &m diameter, with smooth cell walls. Cells uninucleate; chloroplast single and parietal, light green in young cells, becoming yellow-orange with age; pyrenoid single. Asexual reproduction by naked biflagellate zoospores. Zoospores 8-17 x 2.5-4 &m, with apically inserted flagella about 14.5 &m long and trailing; spore shape variable, often rounded at posterior and pointed at anterior; spores with anterior nucleus, eyespot and two contractile vacuoles. Sexual reproduction isogamous, gametes produced in cells of tetrahedral complexes. Gametes similar to zoospores; after syngamy, zygote initially quadriflagellate. Site of meiosis unknown. Pseudotetracystis known only from Texas in soil sample.

Information contributed by: D. Garbary. The most recent alteration to this page was made on 27 Jan 2012 by M.D. Guiry.

Numbers of names and species: There are 3 species names in the database at present, of which 3 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.

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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: 27 January 2012 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43389

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 May 2019.

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