153,567 species and infraspecific names are in the database, 20,980 images, 59,365 bibliographic items, 410,823 distributional records.

Komma D.R.A.Hill, 1991

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

Holotype species: Komma caudata (L.Geitler) D.R.A.Hill

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

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, acuminate, biflagellate monads; with a furrow-gullet system consisting of a tubular gullet extending posteriorly from the subapical vestibulum, and lined usually with two to four rows of ejectisomes; single chloroplast, pyrenoid and nucleomorph, the choroplast with the phycobiliprotein Cr-phycocyanin 645 and varying in color from blue-green to green and fading to yellow-green in older cells; the periplast with inner and superficial component plates. Sexual reproduction is unknown; reproduction is by simple cell division. Cysts are unknown and palmelloid colonies apparently not formed. The ultrastructure has been examined. The periplast has hexagonal inner and superficial component plates, the superficial plates being composed of minute subunits in a crystalline array. The nucleomorph is closely appressed to the ventral surface of the pyrenoid, but is not within the pyrenoidal matrix. Thylakoids do not traverse the pyrenoidal matrix. Cosmopolitan distribution in freshwater habitats, including temporary ponds, rivers and lakes. Komma represents a natural assemblage of cryptomonads - probably four or five more than the single present species. There is some doubt, however, whether Komma is synonymous with Chroomonas or not.

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 is only one species or infraspecific name in the database at present, which has 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.

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

Verification of data
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Contributors
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: 16 April 2003 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=45715

Citing AlgaeBase
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 November 2018.

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