Anisonema Dujardin, 1841, nom. et typ. cons.
Holotype species: Anisonema acinus Dujardin
Original publication and holotype designation: Dujardin, F. (1841). Histoire naturelle des Zoophytes, Infusoires, comprenant la physiologie et la clasification de ces animaux et la manière de les étudier à l'aide du microscope. pp. i-xii, 1-684. Paris: Librarie Encyclopédique de Roret.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Cavalier-Smith, T. (2016). Higher classification and phylogeny of Euglenozoa. European Journal of Protistology 56: 250–276, 2 figs.
Description: Rigid or semi-rigid, ovoid, flattened, colorless, phagotrophic cells, 10-80 µm long, with a strong ventral furrow but no ingestion organelle visible in the light microscope. Two flagella, both emergent from the subapical canal opening, subequal or unequal in length, heterodynamic, the shorter one directed anteriorly during gliding, the longer (and thicker) trailing posteriorly, usually 2 or 3 times as long as the cell.
Freshwater, brackish and marine; cosmopolitan.
Information contributed by: G.F. Leedale & M.D. Guiry. The most recent alteration to this page was made on 28 Dec 2017 by M.D. Guiry.
Comments: Electron microscopy by Triemer (1985) shows his "Anisonema sp." to have a feeding apparatus of vanes and rods as found in Peranema, Dinematomonas and Urceolus. Triemer and Farmer (1991a, 1991b) argue that this and other observations on Calycimonas and Petalomonas remove the justification for separation of the orders Sphenomonadales and Heteronematales. However, existence of ingestion rods in Anisonema acinus and the numerous other described species has not yet been demonstrated and it could reasonably be suggested that Triemer's "Anisonema sp." is a Heteronema.
Numbers of names and species: There are 58 species names in the database at present, as well as 12 infraspecific names. Of the species names, 18 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.
Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.
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: 28 December 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43658
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 25 January 2021.