Aphanizomenon A.Morren ex& Flahault, 1888: 241
Lectotype species: Aphanizomenon flosaquae Ralfs ex Bornet & Flahault
Original publication:Bornet, É. & Flahault, C. (1886 '1888'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France. Annales des Sciences Naturelles, Botanique, Septième Série 7: 177-262.
Type designated inKirchner, O. (1898). Schizophyceae. In: Die natürlichen Pflanzenfamilien...I. Teil, Abt. 1a. (Engler, A. & Prantl, K. Eds), pp. 45-92. Leipzig: Wilhelm Engelmann.
Taxonomic status: currently recognized as a distinct genus.
Description: Filaments free-floating, solitary, in few species joined into fascicle-like, microscopic or macroscopic (up to 2 cm long) colonies with trichomes oriented in parallel; trichomes straight, slightly curved or slightly coiled, cylindrical or sharply or continually tapering to the ends, at crosswalls constricted or not, always without firm sheaths, several species with very fine mucilaginous, diffluent and colorless envelopes (?); trichomes uniseriate, in the middle part usually cylindrical, isopolar, with distinctly elongated and sometimes vacuolized cells at the ends, with the apical cells long, cylindrical and hyaline (at the end rounded or obtuse), or intensely elongated, narrowed, vacuolized up to hyaline and sharply or bluntly pointed, or conical, slightly elongated and only occasionally with small vacuoles (subgenera?); trichomes always subsymmetric, with 1-3 distant, intercalary developed heterocytes, which are localized subsymmetrically at the fully developed trichomes (shifted to one end of a trichome). Vegetative cells cylindrical or barrel-shaped, more or less isodiametrical or slightly shorter or longer than wide, pale blue-green or blue-green, usually with aerotopes, but several species facultatively or always without gas vesicles under special environmental conditions. Heterocytes barrel-shaped or cylindrical with rounded or obtuse ends, which can completely disappear under special conditions (under high N-content). Akinetes rarely spherical or widely oval, usually oval to long, cylindrical with rounded ends, developing paraheterocytically, solitary or in short rows (in 2 or 3), close to heterocytes or slightly distant from them, usually in asymmetrical position in a trichome. Vegetative cells divide transversely and grow to original size before the next division; terminal cells do not divide; without meristematic zones. Reproduction by trichome dissociation and by akinetes. Almost all species are planktonic, sometimes forming characteristic water blooms, the well-known type species (A. flos-aquae) is important in managed fish ponds and in lakes; mainly are distributed in eutrophic reservoirs, few species are halophilic. All species have limited areas of distribution (and possess characteristic species ecology), several species are described as endemic (e.g., from Caspian Sea).
NCBI Nucleotide Sequences
Numbers of names and species: There are 41 species (and infraspecific) names in the database at present, of which 15 have been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Aphanizomenon americanum E.G.Reinhard P
Aphanizomenon aphanizomenoides (Forti) Hortobágyi & Komárek S
Aphanizomenon balticum P
Aphanizomenon capricorni G.Cronberg & J.Komárek S
Aphanizomenon chinense Negoro C
Aphanizomenon cyaneum Ralfs P
Aphanizomenon cyaneum Ralfs ex Bornet & Flahault P
Aphanizomenon elenkinii var. gracile Kashtanova P
Aphanizomenon elenkinii f. maeoticum Pitsyk P
Aphanizomenon elenkinii Kisselev S
Aphanizomenon flexuosum J.Komárek & L.Kovácik C
Aphanizomenon flosaquae (Linnaeus) Ralfs S
Aphanizomenon flosaquae var. gracile Lemmermann S
Aphanizomenon flosaquae var. klebahnii Elenkin C
Aphanizomenon flosaquae f. gracile (Lemmermann) Elenkin S
Aphanizomenon flosaquae f. macrosporum Fedorov C
Aphanizomenon flosaquae Ralfs ex Bornet & Flahault C - type
Aphanizomenon flosaquae f. incurvatum Chernov C
Aphanizomenon gracile (Lemmermann) Lemmermann C
Aphanizomenon holsaticum P.Richter C
Aphanizomenon hungaricum Komárek.-Legn. & Mátyás P
Aphanizomenon incurvum C.Morren U
Aphanizomenon issatschenkoi (Usacev) Proshkina-Lavrenko S
Aphanizomenon kaufmannii Schmidle P
Aphanizomenon klebahnii Elenkin ex Pechar P
Aphanizomenon manguinii Bourrelly S
Aphanizomenon morrenii Kufferath C
Aphanizomenon ovalisporum Forti S
Aphanizomenon ovalisporum f. brevicellum Ulomskii P
Aphanizomenon ovalisporum f. oblongum Ulomskii P
Aphanizomenon paraflexuosum M.Watanabe C
Aphanizomenon platense Seckt C
Aphanizomenon schindleri Kling, Findlay & Komárek C
Aphanizomenon skujae J.Komárková-Legnerová & G.Cronberg C
Aphanizomenon slovenicum Rekar & Hindak C
Aphanizomenon sphaericum Kisselev S
Aphanizomenon strictum Nayal C
Aphanizomenon tropicalis M.Horecká & J.Komárek S
Aphanizomenon ussaczevii Proshkino-Lavrenko S
Aphanizomenon volzii (Lemmermann) Komárek S
Aphanizomenon yezoense M.Watanabe P
Werner, V.R., Laughinghouse, H.D.IV, Fiore, M.F., Sant'Anna, C.L., Hoff, C., de Souza Santos, K.R., Neuhaus, E.B., Molica, R.J.R., Honda, R.Y. & Echenique, R.O. (2012). Morphological and molecular studies of Sphaerospermopsis torques-reginae (Cyanobacteria, Nostocales) from South American water blooms. Phycologia 51(2): 228-238.
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.
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43592
Cite this record as:
Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 13 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6816