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Coelomoron

Generic name: COELOMORON Buell, 1938. Bull. Torrey Bot. Club 65: 379.
Synonyms:
Diagnosis:
Type species:Coelomoron regularis Buell 1938
Descriptions:
Komárek (2003): Cells are arranged more or less peripherally in one or a few layers (may be variable) near the surface of the microscopic, spherical, free-living colonies, which are sometimes composed of subcolonies. Colonial mucilage is fine, homogeneous, colorless, and usually diffuse at the margin, but usually more densely clustered in the center. Cells in young colonies are randomly and sparsely distributed, distant and variably arranged, and usually slightly shifted from one layer; later cells are arranged distinctly peripherally, forming one to three irregular layers. Cells are slightly elongated, widely oval to almost spherical, and radially situated in the colony (generic feature), pale blue-green or olive green, and 1-6.5 X 0.8-4 μm. One species (C. minimum) has distinct aerotopes (gas vacuoles). Cell division occurs in two planes in
successive generations, perpendicular to one another and more or less to the colony surface. Reproduction is by disintegration of colonies.
Komárek & Anagnostidis (1998): Colonies microscopic, more or less spherical or irregular spherical, sometimes compound, free floating, enveloped by fine, colourless, diffluent, very often indistinct, rarely distinct delimited mucilage. Cells in young colonies randomly and more or less sparsely disposed, diverging slightly radially from one another, in old colonies concentrated in the peripheral layer or up to three layers thick. In the center of colonies is a condensed cluster of slime, from which radiate irregular, fine and diffluent stalks or protuberances, which very soon disappear (staining !); in the center of old colonies fine slime. Cells slightly elongate, situated more or
less radially in the outer layers.
Komárek (1992): Unicellular - colonial; colonies microscopic, spherical, oval or irregularly spherical, mucilaginous, free living (floating or in metaphyton) in freshwater reservoirs, enveloped by colourless, fine and diffluent mucilaginous envelopes; cells are situated +/- radially and +/- irregularly in one to 3 layers on the periphery of colonies. Cells slightly elongated, widely oval, obovoid or almost spherical, radially and (in old colonies) densely arranged, without aerotopes, greyish blue-green,
bright blue-green or olive green, finely granulated. Mucilaginous envelopes unstructured, but particularly in young colonies the dense mucilage clusters (irregular, fine, diffluent stalks) are in the centre of colonies (the cells are joined to the lobes of this cluster); this central mucilaginous cluster later disappears.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek & Anagnostidis (1998):Cell division in two planes in successive generations, perpendicular one to another and more or less to the colonial surface; reproduction by disintegration of colonies.
Komárek (1992): Division of cells in two directions in subsequent generations, perpendicular to each other and to the surface of the colony. Old colonies disintegrate in small subcolonies up to solitary cells.
Ultrastructure:
Taxonomic position, higher hierarchy: Cyanophyceae,
Chroococcales, Merismopediaceae, Gomphosphaerioideae
Notes to taxonomy, misinterpretations:
Komárek (2003): Seven described species (Komárek & Anagnostidis, 1998) exist, but further species may be discovered.
Ecology, ecophysiology, ecological significance:
Komárek (1992): All species prefer the stagnant freshwater biotopes (swamps, small' - reservoirs). The type species is known only from North America (USA, Minnesota), two species from littorals of lakes and swamps in tropical countries (described from Cuba, from metaphyton among aquatic plants). C. pusillum is commonly spread in plankton of slightly eutrophized reservoirs in temperate and subtropic zones (probably cosmopolite), but occurring in several morphotypes.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Coelomoron microcystoides Komárek 1988
Coelomoron minimum (Bernard) Komárková-Legnerová et Tavera 1996
Coelomoron pusillum (Van Goor) Komárek 1988
Coelomoron regulare Buell 1938
Coelomoron tropicale Senna et al. 1998
Coelomoron vestitum  Komárek 1988

Unclear taxa:
Chroococcus rochei Virieux 1911
Microcystis chroococcoidea W. et G.S. West 1911
Woronichinia obtusa Joosten 2006

Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: Geitler 1942, Komárek & Hindák 1987, Komárek 1992, Komárková-Legnerová & Tavera 1996, Senna & al.1998,
Komárek & Anagnostidis 1998, Komárek 2003
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: