153,840 species and infraspecific names are in the database, 21,012 images, 59,576 bibliographic items, 413,468 distributional records.

Ankistrodesmus Corda, 1838

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Chlorophyceae
Order Sphaeropleales
Family Selenastraceae

Lectotype species: Ankistrodesmus fusiformis Corda

Original publication:Corda, J.-A.-C. (1838). Nouvelles observations microscopiques. Almanach de Carlsbad 8: 179-198.
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Type designated in Komárková-Legnerová, J. (1969). The systematics and ontogenesis of the genera Ankistrodesmus Corda and Monoraphidium gen. nov. In: Studies in Phycology. (Fott, B. Eds), pp. 75-144. Stuttgart: Schweizerbart'sche.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: John, D.M. & Tsarenko, P.M. (2002). Order Chlorococcales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 327-409. Cambridge: Cambridge University Press.

Description: Cells rarely solitary, mostly in few to many celled colonies with 4-16 (-128) cells. Mucilaginous envelopes present or absent. Cells elongate with pointed and often highly attenuate tips; sometimes straight but more often curved or twisted, 15-105 x 1-6 µm. Cells mostly in parallel bundles, in some species individual cells or bundles rotating to give spiked or stellate appearance to colony. Cell walls smooth. Cells uninucleate; chloroplast parietal and band shaped, single, but becoming multiple prior to autospore formation; pyrenoids absent. Asexual reproduction by autospore formation and colony fragmentation; 2-4-8 (-16) spores per sporangium. Spores formed in parallel in one or two series in bundles that remain more or less distinct after release. Spore release by transverse tear in central part of sporangial wall; wall fragments discarded or dissolving. Flagellated stages and sexual reproduction unknown. Ankistrodesmus planktonic and cosmopolitan in freshwater lakes or associated with littoral vegetation; most species in slightly acidic non-polluted waters. Most species in temperate waters, some species (e.g. A. bernardii) restricted to tropical environments. Comparative physiology and biochemistry of numerous strains extensively studied by Kessler and collaborators. Growth of Ankistrodesmus braunii sensitive to similar levels of the herbicide, simazine, as filamentous, mat-forming species. Selenastrum and Ankistrodesmus closely related with some authors considering them synonymous; the key difference being the degree of cell curvature with Ankistrodesmus being more or less straight or slightly curved and Selenastrum being strongly curved. Some authors suggest that a pyrenoid may be present. Species distinguished mostly by details of cell size and shape.

Information contributed by: D. Garbary & F. Hindák. The most recent alteration to this page was made on 9 Jul 2012 by Michael Guiry.

Numbers of names and species: There are 87 species names in the database at present, as well as 66 infraspecific names. Of the species names, 24 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.

Krienitz, L., Bock, C., Nozaki, H. & Wolf, M. (2011). SSU rRNA gene phylogeny of morphospecies affiliated to the bioassay alga "Selenastrum capricornutum" recoverd the polyphyletic origin of crescent-shaped Chlorophyta. Journal of Phycology 47(4): 880-893.

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: 23 April 2002 by M.D. Guiry

Verified by: 09 July 2012 by Michael Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44102

Citing AlgaeBase
Please cite this record as:
Michael 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 December 2018.

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