Coelosphaerium Nägeli, 1849

Holotype species: Coelosphaerium kuetzingianum Nägeli

Original publication and holotype designation: Nägeli, C. (1849). Gattungen einzelliger Algen, physiologisch und systematisch bearbeitet. Neue Denkschriften der Allg. Schweizerischen Gesellschaft für die Gesammten Naturwissenschaften 10(7): i-viii, 1-139, pls I-VIII.

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Description: Unicellular - colonial; colonies microscopic, spherical, free-living (mainly planktonic), enveloped by colorless, indistinct or limited fine mucilage, without any inner stalk system, cells situated in one layer near the surface of colony. Cells spherical, mainly distant from one another, peripherally situated, found more densely in old colonies than in young ones, pale or bright blue-green, 2 species with aerotopes. Cell division in 2 directions in successive generations, perpendicular to each other and to the surface of the colony; the daughter cells separate from one another and grow to the original spherical shape and size before the next division. Reproduction by the dissociation of colonies. Well known species (C. dubium, C. kützingianum, C. confertum, C. minutissium, etc.) are planktonic; C. dubium from northern Europe, 3 others probably with the cosmopolitan distribution, the last 2 being more common in warmer and tropical areas. All species occur predominantly in large, not very eutrophic reservoirs. The taxonomy, ecology and distribution of other species are still unclear.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-03 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 18 May 2024

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