154,920 species and infraspecific names are in the database, 21,111 images, 59,864 bibliographic items, 429,774 distributional records.

Chroomonas Hansgirg, 1885

Empire Eukaryota
Kingdom Chromista
Phylum Cryptophyta
Class Cryptophyceae
Order Cryptomonadales
Family Hemiselmidaceae

Holotype species: Chroomonas nordstedtii Hansgirg

Currently accepted name for the type species: Cryptomonas nordstedtii (Hansgirg) Senn

Original publication and holotype designation: Hansgirg, A. (1885). Anhang zu meiner Abhandlung "Ueber den Polymorphismus der Algen". Botanisches Centralblatt 23: 229-233.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-189. Stuttgart: Borntraeger Science Publishers.

Description: Free-swimming, elliptic, biflagellate monads that often form thickly mucilaginous, palmelloid colonies. Lacking a furrow, the cells have a longitudinal, tubular gullet that extends posteriorly from the subapical vestibulum. The gullet is lined, usually, with two to four longitudinal rows of ejectisomes. Single chloroplast, pyrenoid and nucleomorph; the chloroplast containing the phycobiliprotein, Cr-phycocyanin 645 (and, rarely, Cr-phycocyanin 630), and varying in color from sky blue to blue-green and green. With or without an eyespot. Periplast with inner and superficial plates sandwiching the plasma membrane. Sexual reproduction is unknown, reproduction being by simple cell division often in the palmelloid state. Cyst production is unknown. The ultrastructure of several species has been examined. The inner periplast plates are rectangular and have strong attachment sites to the plasma membrane along their posterior margins. The superficial periplast plates are also rectangular and composed of small subunits in a crystalline arrangement and surrounded by lax fibrillar borders. The nucleomorph is not associated with the pyrenoid. The matrix of the pyrenoid is traversed by one or two pairs of thylakoids. The eyespot is located on an isolated medial lobe of the chloroplast and has an associated vacuolar system. The flagella possess an imbricate layer of rosulate scales. Mitosis and cytokinesis have been examined in Chroomonas africana. The genus has a cosmopolitan distribution in both marine and freshwater habitats, every continent. Some fifty species have been assigned to the genus but it is likely that after revision the number will be greatly reduced. Most species are described from European waters and many are known only from their type localities. Butcher (1967) extended the definition of the genus to include red-brown species and this approach was also adopted by Bourrelly (1970) and Starmach (1974), but has not been followed in more recent taxonomic treatments (Santore 1984, Hill 1991).

Information contributed by: D.R.A. Hill. The most recent alteration to this page was made on 26 May 2017 by M.D. Guiry.

Numbers of names and species: There are 55 species names in the database at present, as well as 9 infraspecific names. Of the species names, 37 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.

Throndsen, J. (1996). The planktonic marine flagellates. In: Identifying marine phytoplankton. (Tomas, C.R. Eds), pp. 591-730. San Diego: Academic Press.

Hill, D.R.A. (1991). Chroomonas and other blue-green cryptomonads. Journal of Phycology 27: 133-145, 44 figs.

Hoef-Emden, K. (2008). Molecular phylogeny of phycocyanin-containing cryptophytes: evolution of biliproteins and geographical distribution. Journal of Phycology 44: 985-993.

Chrétiennot-Dinet, M.-J. (1990). Atlas du phytoplancton marin. Volume III: Chlorarachnophycées, Chlorophycées, Chrysophycées, Cryptophycées, Euglénophycées, Eustigmatophycées, Prasinophycées, Prymnesiophycées, Rhodophycées et Tribophycées Avec la collaboration de Chantal Billard et Alain Sournia. pp. [1]-261. Paris: Éditions du Centre National de la Recherche Scientifique 15, quai Anatole France - 75700 Paris.

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: 26 May 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43570

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 March 2019.

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