155,254 species and infraspecific names are in the database, 21,864 images, 60,045 bibliographic items, 435,060 distributional records.

Pseudoschroederia Hegewald & Schnepf, 1986

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

Holotype species: Pseudoschroederia robusta (Korshikov) E.Hegewald & E.Schnepf

Original publication and holotype designation: Hegewald, E. & Schnepf, E. (1986). On the structure and taxonomy of the spindle-like Chlorellales (Chlorophyta): Schroderia, Pseudoschroederia gen. nov., Closteriopsis. Arch. Hydrobiol. (Suppl. 73), Algol. Stud. 42: 21-48. [in German]

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..

Taxonomic notes
Possibly Schroederiaceae (Fuciková et al., 2014: 21). - (2 Apr 2014) - Wendy Guiry

Description: Solitary, free living cells mostly without mucilage, however, P. punctata with fibrous mucilage. Cells fusiform and straight or slightly curved or sinuate, 22-84 µm long, with two long polar appendages. Basal appendage, spine like and tapering to point whereas other appendage blunt and covered with fine hairs. Cell walls mostly smooth (punctate in P. punctata), without sporopollenin. Cells uninucleate; single chloroplast parietal and band shaped with single pyrenoid often becoming double in old cultures. Pyrenoid not traversed by thylakoids and with distinct starch sheath. Asexual reproduction by biflagellate zoospores; sporangial release by longitudinal tear in lateral wall. Zoospores 7.6-12.2 µm long, with anterior contractile vacuoles, parietal chloroplast, some spores with short anterior projection between flagella. Zoospores of P. antillarum without stigma, not phototactic. Akinetes formed by enlargement of main part of cell to form large spherical body to 35 µm diameter with polar appendages. On germination akinetes release zoospores. Sexual reproduction unknown. Pseudoschroderia planktonic in freshwater; reported from Europe, India and North America but likely cosmopolitan. Genus distinguished from Schroderia based on cell wall structure and heteropolarity. Genus assigned to subfamily Schroederioideae. Species distinguished based on cell size and shape and details of cell wall features.

Information contributed by: D. Gargary & T. Kalina. 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.

Fuciková, K., Lewis, P.O. & Lewis, L.A. (2014). Putting incertae sedis taxa in their place: a proposal for ten new families and three new genera in Sphaeropleales (Chlorophyceae, Chlorophyta). Journal of Phycology 50(1): 14-25.

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

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: 17 August 2004 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=44587

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 21 May 2019.

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