Arthronema

Generic name: ARTHRONEMA Komárek et Lukavský, 1988. Algolog. Stud. 50-53: 266.

Synonyms:

Diagnosis:

Type species: Arthronema africanum (Schwabe et Simonsen) Komárek et Lukavský 1988.

Descriptions:
Komárek (1992): Filamentous; filaments simple, unbranched, rarely solitary, usually joined and tangled in fine, diffluent mats, microscopic, or later macroscopic, forming blue-green layers. Trichomes without mucilage, without sheaths, at cross walls unconstricted or slightly constricted, isopolar, slightly irregularly waved, narrow, 0.8-5 /um wide, uniserial, more or less cylindrical up to the ends,. immotile. All cells cylindrical, after division more or less isodiametrical or slightly shorter than wide, later up to 5-times longer than wide, without aerotopes, sometimes with several prominent granules within protoplast, with thylakoids arranged concentrically along the cell walls; end cells widely rounded or obtuse. Swollen involution cells appear in trichomes in dependence on the environmental conditions. Cell content intensely blue-green, without phyco-erythrin. Heterocytes and akinetes missing.

Genotype differences, molecular data:

Reproduction strategies, life cycles, cell division:
Komárek (1992):Cell division crosswise, sometimes asymmetrical; all cell capable to divide. Reproduction by trichome fragmentation in few-celled (up to unicellular) immotile segments, without necridid. cells.

Ultrastructure:

Taxonomic position, higher hierarchy:
Cyanophyceae, Oscillatoriales, Pseudanabaenaceae, Pseudanabaenoideae
Notes to taxonomy, misinterpretations:

Ecology, ecophysiology, ecological
significance:
Komárek (1992):The single known species, A. africanum, grows in wet, salinic places (drying pools) in desert areas (Libya, Kuwait) below the surface of sandy substrate. Probably more species exist with different ecology.

Physiology and biochemistry:

Distribution, endemism, problematic
citations:

Reference strain:

Infrageneric scheme, species concept:

List of species:
Arthronema africanum (Schwabe et Simonsen) Komárek et Lukavský 1988
Arthronema gygaxiana Casamatta et Johansen 2005

Keys:

List of stains:

Application technology:

Drawings:

Komárek
(1992)

Literature:

	2.1 taxonomy: Komárek et Lukavský 1988, Komárek 1992; Casamatta et Johansen 2005
	2.2 cytomorphology:
	2.3 16S rRNA sequencing:
	2.4 biology and life cycles:
	2.5 ecology:

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