Holotype species: Uroglena volvox Ehrenberg
Original publication and holotype designation: Ehrenberg, C.G. (1834). Dritter Beitrag zur Erkenntniss grosser Organisation in der Richtung des kleinsten Raumes. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1833: 145-336, pls I-XIII.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Wujek, D.E. & Thompson, R.H. (2002). The genera Uroglena, Uroglenopsis and Eusphaerella (Chrysophyceae). Phycologia 41: 293-305.
Description: Colonies free-swimming, up to 3 mm in diam., consisting of a great number of cells which are radially arranged at the periphery of a spherical to ellipsoid or more irregular gelatinous matrix. Interior of the matrix fairly homogeneous or containing a system of fine, radiating and branched threads to which the cells are attached by their pointed posterior ends. Individual cells Ochromonas-like, spherical to ellipsoid or pyriform, bearing two flagella of unequal length at the anterior end. Chloroplasts 1-2, laminate to discoid, at least in one species containing a pyrenoid, stigma usually one, rarely two or lacking altogether. Protoplast also containing 1-3 contractile vacuoles and numerous mucocysts lying just under the cell surface and apparently giving rise to the gelatinous threads. Cells and colonies of Uroglena are extremely delicate and the slightest disturbance may break them up. Amoeboid flagellated cells have also been observed. Cell division is longitudinal and colony reproduction appears to take place by constriction into two daughter colonies or by fragmentation. Stomatocysts, sometimes binucleate and possessing a conspicuous wall ornamentation, have been observed in several species. Found almost exclusively in freshwater, one species marine. Some of the species are of abundant occurrence and very characteristic in clear water lakes in temperate regions worldwide. Species of Uroglena may produce a disagreeable fishy odor in water supplies.
Information contributed by: H. R. Preisig. The most recent alteration to this page was made on 17 Aug 2016 by M.D. Guiry.
Comments: Kristiansen & Preisig (2001: 9) record this genus as alternately being a member of the family Ochromonadaceae Lemmerman 1899.
Numbers of names and species: There are 26 species names in the database at present, as well as 5 infraspecific names. Of the species names, 11 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.
Nicholls, K.H. & Wujek, D.E. (2003). Chrysophycean Algae. In: Freshwater Algae of North America. (Wehr, J.D. & Sheath, R.G. Eds), pp. 471-510. San Diego: Academic Press.
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: 11 April 2002 by M.D. Guiry
Verified by: 17 August 2016 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43792
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 November 2018.