Swarchewskiella Yasnitsky [Yasnitskii], 1931
Holotype species: Swarchewskiella rotans Yasnitsky
Taxonomic status: currently recognized as a distinct genus.
Description: Unicellular epiphyte on the stalks of diatoms (Gomphonema, Didymosphaenia). The cell is without a wall but located in a closed, hemispherical, gelatinous theca. The four flagella, by the movement of which the cell can move inside the theca, extend through the theca. Each cell has a parietal chloroplast with a single basal pyrenoid and a stigma located in the anterior half of the cell. Vegetative division by quadriflagellate zoospores. The upper part of the theca opens as an operculum, releasing 4-8 zoospores. Sexual reproduction by fusion of quadriflagellate gametes, smaller than the zoospores but morphologically similar. This remarkable green alga shows some similarity to Prasinochloris, but ultrastructural studies have not been performed and the phylogenetic affinity is therefore uncertain.
Information contributed by: Øjvind Moestrup. The most recent alteration to this page was made on 2 Nov 2016 by M.D. Guiry.
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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.
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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 September 2004 by Robert Wilkes
Verified by: 02 November 2016 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=47508
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 27 September 2020.