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Cyanocatenula

Generic name: CYANOCATENULA Joosten, 2006. Flora of the Blue-green algae of the Netherlands I., p. 207 
Synonyms:
Diagnosis:
Joosten (2006): Coloniae libere natantes. Cellulae solitariae, geminatae vel 4 in serie brevi intra mucum colonialem irregulariter distributae. Cellulae solitariae calyptra brunnea ambitu semicirculari in extremo unico (verosimiliter praecipitia ferrea). Geminatae vel seriales calyptra unica vel calyptris in extremis ambobus. Cellulae minutissimae sine aerotopis. Divisio cellularis fissione binaria simplici divisio nis plano unico. Cellula filialis una tantum calyptra statim post divisionem, postea calyptra nova ad cellulae filiali alterae extremum oppositum formata est. Cellulae post divisionem saepe in positione obliqua vel etiam parallela rotatant.
Type species:  Cyanocatenula calyptrata Joosten 2006
Descriptions:
Joosten (2006): Colonies free-floating. Cells solitary, in pairs or in short rows of four cells, irregularly distributed within the colonial mucilage. Solitary cells with a brown cap with semicircular outline at one end, probably consisting of ferric precipitates. Cell pairs or rows of four cells with a single cap or with a cap on either side. Cells very small, without aerotopes. Cell division by simple binary fission, with a single plane of division. Only one daughter cell has a cap immediately after cell division. Later, a new cap is formed at the opposite end of the other daughter-cell. Cells often rotate into an oblique or even parallel position after cell division.
Genotype differences, molecular data:
Reproduction strategies,life cycles, cell division:
Ultrastructure:
Taxonomic position, higher hierarchy:
Joosten (2006): Several species from entirely unrelated bacterial lineages produce iron precipitates in the form of large brown granules in the colonial mucilage, without a specific orientation with respect to the cells. Examples are the blue-green algae Cyanogranis spp. and Merismopedia ferrophila F. Hindák 1982, the colourless bacteria Planctomyces condensatus H.L. Skuja 1964 and cf. Pasteuria sp. in Sokolova 1959, as well as an unidentified colourless bacterium that resembles Cyanogranis. Therefore, this type of precipitation is possibly of limited taxonomic value. In the genus Cyanocatena F. Hindák 1975 ring-like precipitates are formed. These rings are always situated between pairs of cells after cell-division, not at the opposite ends as in Cyanocatenula. The precipitates found in Cyanocatena and Cyanocatenula appear to be rather unusual if not unique, and are therefore potentially of higher taxonomic value. - Similar genera: There is a superficial resemblance to other genera with iron precipitates in the colonial mucilage, e.g. Cyanocatena F. Hindák 1975, Cyanogranis F. Hindák 1982 and an unnamed Cyanogranis-like bacterium with colourless
cells.
Ecology, ecophysiology,ecological significance:
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:

Cyanocatenula calyptrata Joosten 2006
Keys:
List of stains:
Drawings, images:
Joosten (2006: 35):Click to enlarge
Application technology:
Literature:

  2.1 taxonomy: Joosten 2006
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: