156,503 species and infraspecific names are in the database, 22,022 images, 60,458 bibliographic items, 447,769 distributional records.

Monomastix Scherffel, 1912

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Prasinophytina
Class Mamiellophyceae
Order Monomastigales
Family Monomastigaceae

Holotype species: Monomastix opisthostigma Scherffel

Original publication and holotype designation: Scherffel, A. (1912). Zwei neue, trichocystenartige Bildungen führende Flagellaten. Archiv für Protistenkunde 27: 94-128.

Taxonomic status: currently recognized as a distinct genus.

Description: Unicellular flagellates with single flagellum emerging just behind the anterior end. Second flagellum present as a basal body only. Cells oblong with single parietal chloroplast covering most of the cell surface. One or two pyrenoids occupy a lateral position. An eyespot, if present, is located near the posterior end. Very conspicuous are the so-called trichocysts, straight, colourless cylinders, a bundle of up to 11 in the posterior part of the cell, and occasionally 1-2 more anteriorly. The long axis of each trichocyst is parallel to the long axis of the cell. Young cells contain only 1-2 trichocysts, and some species have been described to contain only indistinct trichocysts. One, rarely two, contractile vacuoles present anteriorly. The flagellum emerges from a groove near the front end. The distal half of the flagellum is very thin and contains only a single microtubule in the species examined. At rest the flagellum is curved backwards along the sides of the cell or held obliquely in front or more or less perpendicular to the long axis of the cell. The cell is covered with a periplast of very thin imbricated submicroscopical scales very unlike scales found in any other green alga. Coccoid stages known from cultures only. Cysts (probably asexual) surrounded by smooth colourless refractile wall. Cysts with reticulate wall seen by Korshikov (1938) and Scherffel (1912).

Information contributed by: Ø. Moestrup. The most recent alteration to this page was made on 20 Apr 2013 by M.D. Guiry.

Comments: The described species differ mainly in cell size, shape and presence or absence of stigma.

Numbers of names and species: There are 6 species names in the database at present, as well as 2 infraspecific names. Of the species names, 6 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.

References
Cambra Sánchez, J., Álvarez Cobelas, M. & Aboal Sanjurjo, M. (1998). Lista florística y bibliográfica de los clorófitos (Chlorophyta) de la Península Ibérica, Islas Baleares e Islas Canarias. pp. 1-614. Burgos: Asociación Española de Limnología.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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: 11 April 2002 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43572

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 October 2019.

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