157,571 species and infraspecific names are in the database, 22,210 images, 60,987 bibliographic items, 459,373 distributional records.

Catena Chodat, 1900

Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Trebouxiophyceae
Order Chlorellales
Family Chlorellaceae

Holotype species: Catena viridis Chodat

Original publication and holotype designation: Chodat, R. (1900). Sur trois genres nouveaux de Protococcoidées et sur la florule planktonique d'un Étang du Danemark. Mémoires de l'Herbier Boissier 8(17): 1-10.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Krienitz, L., Hegewald, E., Hepperle, D. & Wolf, M. (2003). The systematics of coccoid green algae: 18S rRNA gene sequence data versus morphology. Biologia, Bratislava 58: 437-446.

Description: Filaments short, 4-8 (-16) celled, straight or bent, ensheathed by delicate mucilaginous envelope of varying thickness. Cell united by adherence of conical processes of transverse cell walls. Cell poles, sporadically also middle portions of cells, normally incrusted with brown, often unequal rings or caps effecting distinct widening, or, instead or rings, with irregularly-arranged minute stick-like granules. Cells cylindrical to oval. Chloroplast single, parietal and band-shaped, occupying not more than half cell periphery, pyrenoids absent. Propagation of filaments by fragmentation. Multiplication of cells by vegetative cell division. Method of sexual reproduction unknown. Catena planktonic from various freshwater habitats in central Europe and USA. Catena initially assigned to Protococcales (Chlorococcales); because of multiplication by vegetative cell division, Catena later assigned to Ulotrichales. It resembles Stichococcus by having a short celled, weakly filamentous growth habit, and Hortobagyiella by presence of incrustations on cell surface.

Information contributed by: G.M. Lokhorst. The most recent alteration to this page was made on 19 Mar 2013 by M.D. Guiry.

Numbers of names and species: There are 2 species names in the database at present, of which 2 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.

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: 23 April 2002 by M.D. Guiry

Verified by: 19 March 2013 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44283

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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 26 February 2020.

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