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Siphonosphaera

Generic name: SIPHONOSPHAERA Hindák, 1988. Algolog. Stud. 49: 416.
Synonyms:
Diagnosis:
Type species: Siphonosphaera pannonica, Hindák, 1988. - Monotypic genus.
Descriptions:
Komárek & Anagnostidis (1998): Colonies microscopic, free floating, more or less spherical, composed of radially and slightly irregularly divaricate thick, tube-like, colourless stalks, originating from the colonial center. Cells narrower than stalks, situated within the end of stalks; the whole stalk system with cells is enveloped by the common, fine, diffluent, colourless mucilage; stalks slightly distant from one another. Cells in strings solitary or grouped in twos after division, geminate.
Komárek (1992): Unicellular - colonial; colonies microscopic, +/- spherical, subspherical up to irregularly oval, mucilaginous, multicelled, free living (planktic), enveloped by fine, unstructured, colourless, indistinct, gelatinous envelopes; cells situated solitary or in twos (after division) within the end parts of fine, mucilaginous, colourless, tube-like sheaths opened at the ends, radially oriented and pseudodichotomously branched, originating from the centre of a colony; between single tube-like sheaths are spaces. Cells spherical, after division hemispherical, pale yellowish, blue-green, without aerotopes, in the colony placed +/- peripherally.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998): Cell division in two perpendicular planes in successive generations, reproduction by colony
disintegration.
Komárek (1992): Cell division into two equal parts by binary fission, in two planes in successive generations, perpendicularly to each other and to the surface of the colony; the cells grow into the original size and shape before the next division. Multiplication of colonies by their disintegration in two or more parts.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Chroococcales, Merismopediaceae, Gomphosphaerioideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): The type species was described from the plankton of the lake Balaton (H, SE Europe), and not confirmed yet from other localities.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Siphonosphaera pannonica Hindák 1988
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

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