Pseudoschroederia Hegewald & Schnepf, 1986: 47
Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Chlorophyta
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.
Taxonomic status: currently recognized as a distinct genus.
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.
NCBI Nucleotide Sequences
Numbers of names and species: There are 3 species (and infraspecific) names in the database at present, of which 3 have been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Pseudoschroederia antillarum (Komárek) Hegewald & Schnepf C
Pseudoschroederia punctata E.Hegewald & T.R.Deason C
Pseudoschroederia robusta (Korshikov) E.Hegewald & E.Schnepf C - type
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.
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44587
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 May 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6397
