159,046 species and infraspecific names are in the database, 22,499 images, 61,695 bibliographic items, 462,690 distributional records.

Rhodomonas G.Karsten, 1898

Empire Eukaryota
Kingdom Chromista
Phylum Cryptophyta
Class Cryptophyceae
Order Pyrenomonadales
Family Pyrenomonadaceae

Holotype species: Rhodomonas baltica Karsten

Original publication and holotype designation: Karsten, G. (1898). Rhodomonas baltica, n.g. et sp. Wissenschaftliche Meeresuntersuchungen, Abteilung Kiel, Neue Folge 3: 15-16.

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, generally ovoid, biflagellate monads; the furrow-gullet system consisting of a short furrow extending posteriorly from the vestibulum and transforming into a tubular gullet lined generally with two to four or more rows of ejectisomes; usually with one chloroplast, pyrenoid and nucleomorph, but in a few species these divide shortly after cell division so that there are two chloroplasts, p yrenoids and nucleomorphs for most of the cell cycle; the chloroplast has the phycobiliprotein Cr-phycoerythrin 545 and varies from red-brown to yellow and sometimes green in older cells; periplast with an inner layer of plates and a superficial layer of coarse fibrillar material sandwiching the plasma membrane. Reproduction by simple cell division. Palmelloid colonies are frequently formed and cell division often occurs in this state. Cysts and sexual reproduction are unknown. Typical cryptomonad ultrastructure. The inner periplast plates are roughly rectangular in shape with strong attachment sites to the plasma membrane along their posterior margins; they are organized in offset longitudinal rows. The nucleomorph is located in an invagination of the periplastidial compartment into the pyrenoid. The pyrenoidal matrix is not traversed by thylakoids. The fine structure of the thylakoids has been examined in some detail. Early reports on the fine structure of mitosis in the Cryptophyceae were with species of Rhodomonas. This genus has also, more recently, been used in a series of rather elegant experiments proving the presence of and localizing DNA in the nucleomorph. These experiments were facilitated by the location of the nucleomorph in the pyrenoidal matrix. Rhodomonas is cosmopolitan and common, although rarely abundant, in marine and brackish waters and two freshwater species are known from Europe. The genus is easy to recognize under the light microscope and the species easily cultured. Species of Rhodomonas have therefore often been the subject of research, although the name rarely appears in the literature due to a checkered taxonomic history. The name has often been overlooked due to the implication of color being of primary diagnostic importance. Other more important features have more recently indicated that Rhodomonas is indeed a natural assemblage of cryptomonads. Emend. Hill & Wetherbee (1989: 155) but see Novarino (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 28 species names in the database at present, as well as 5 infraspecific names. Of the species names, 16 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. & Wetherbee, R. (1989). A reappraisal of the genus Rhodomonas (Cryptophyceae). Phycologia 28: 143-158.

Novarino, G. (1991). Observations on Rhinomonas reticulata comb. nov. and Rhinomonas reticulata var. eleniana var. nov. (Cryptophyceae), with comments on the genera Pyrenomonas and Rhodomonas. Nordic Journal of Botany 11: 243-252.

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

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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 27 September 2020.

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