Komma D.R.A.Hill, 1991

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.

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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 2017-05-26 by M.D. Guiry.

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

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. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.

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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.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 May 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024