Lectotype species: Colacium vesiculosum Ehrenberg
Original publication: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.
Type designated in
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Cavalier-Smith, T. (2016). Higher classification and phylogeny of Euglenozoa. European Journal of Protistology 56: 250–276, 2 figs.
According to Kim et al. (2010), the genus Colacium was located at the base of the Euglenaceae lineage. [The type species C. vesiculosum Ehrenberg was not included in fig. 1 (Kim et al. 2010)] - (13 Jun 2012) - Wendy Guiry
Description: Green Euglena-like cells, 15-50 x 5-20 _m, normally attached to a substratum by mucilaginous secretions from the canal, cell division resulting in clumps of cells or dendroid colonies of a few to hundreds of cells joined to each other by mucilaginous stalks. The settled cells shed the long flagellum but retain their 2 flagella within the reservoir, including the (reduced) flagellar swelling. Any cell can regrow the locomotory flagellum (in about an hour), escape from the colony as a free-swimming organism (indistinguishable from Euglena), settle elsewhere on its anterior end and secrete a new stalk and sheath of mucilage. Studies of this genus have been made by Johnson (1934) and Pringsheim (1953a) and with EM by Willey and Wibel (1985) who demonstrate a possible homologue of the cytopharynx of Isonema (Diplonema) and bodonids. Freshwater, growing attached to filamentous algae, aquatic angiosperms, Cyclops, Daphnia and other aquatic animals, including fish; fairly common worldwide.
Information contributed by: G.F. Leedale. The most recent alteration to this page was made on 30 Dec 2017 by M.D. Guiry.
Numbers of names and species: There are 17 species names in the database at present, as well as 6 infraspecific names. Of the species names, 15 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.
Nudelman, M.A., Rossi, M.S., Conforti, V. & Triemer, R.E. (2003). Phylogeny of Euglenophyceae based on small subunit rDNA sequences: taxonomic implications. Journal of Phycology 39: 226-235.
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: 30 December 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43647
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 13 December 2018.