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Cyanotetras

Generic name: CYANOTETRAS Hindák, 1988. Preslia 60: 291.
Synonyms:
Diagnosis:
Type species:Cyanotetras fusca Hindák, 1988
Descriptions:
Komárek (2003): Cells occur in microscopic, free-floating colonies that are flat or platelike and composed from slightly elongated cells, the longer axis of which lies in the plane of the colony. Colonies typically are few-celled. The cells are arranged in short perpendicular rows, but have irregularities. The colony is surrounded by very fine, colorless, and diffuse mucilage. Cells are oval or ovoid, sometimes in twos or flat tetrads, have pale blue-green color and, homogeneous content. One species has gas vesicles and visible aerotopes; another species has iron precipitates within the mucilage. Cells are 1.5-5 μm long and 1-4.5 μm wide. Cells divide by binary fission in two planes in successive generations, perpendicularly to one another and to the plane of the colony.

Komárek & Anagnostidis (1998): Colonies microscopic, free floating, flat, tabular, one-layered, few-celled, surrounded by wide, homogeneous mucilaginous envelope. Cells oval, arranged in twos or flat tetrads. Cell content homogeneous, with solitary granules.
Komárek (1992): Unicellular - colonial; colonies microscopic, free living, with 1-16, mainly 4-8 cells, which are more or less regularly joined into flat, unilayered, tabular agglomerations; the short rows of cells are situated more or less perpendicularly to each other; the flat, cellular agglomerations are enveloped by the spherical, oval or ellipsoidal, not structured, fine mucilaginous envelopes; the envelopes are colour less or homogeneously coloured with fine ferric precipitations. Cells more
or less oval, ellipsoidal or slightly irregular ovoid, usually tightly joined one to another; colonies usually slightly elongated in the direction of the longer axis of cells. Cell content pale blue-green or olive green, without aerotopes, sometimes with dispersed granules.

Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division into two equal parts, in two perpendicular planes in successive generations; reproduction by fragmentation of colonies.
Komárek (1992): Cell division in two perpendicular. planes in successive generations; the cells remain joined together in 2-4-8-32-celled colonies, later desintegrate in smaller colonies up to in solitary cells.
Ultrastructure:
Taxonomic position, higher hierarchy: Cyanophyceae,
Chroococcales, Merismopediaceae, Merismopedioideae
Notes to taxonomy, misinterpretations:Three
species.
Ecology, ecophysiology, ecological significance:
Komárek (1992): Not well known genus. In plankton and metaphyton of small, freshwater, not very eutrophicated and polluted water reservoirs, mainly with plenty of water plants, rarely in lakes. The type species is known from the central Europe, the other ones from the subtropical Cuba and from south Canadian lakes,
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Cyanotetras aerotopa Komárek et Komárková-Legnerová 2002
Cyanotetras crucigenielloides Komárek 1995
Cyanotetras fusca Hindák 1988
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Hindák 1988, Komárek 1992, Komárek & Anagnostidis 1998, Komárek 2003 
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: