Limnothrix
| Generic name: LIMNOTHRIX Meffert, 1988. Arch. Hydrobiol., Suppl. 76, 4: 317. | ||||||||||
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| Type species: Limnothrix redekei (Van Goor) Meffert 1988 | ||||||||||
| Descriptions: Komárek (1992): Filamentous; filaments solitary, free floating, straight or slightly curved or irregularly screw-like coiled, many-celled, isopolar, without sheath or with very fine, colourless , facultative sheath (in several species). Trichomes cylindrical, composed from cells which are isodiametric or longer than wide (sometimes several times), unconstricted or slightly constricted at the cross walls, with very thin walls, with missing or very reduced motility, 1-6 um wide, not tapering to the ends, usually with cylindrical (but sometimes with conical) apical cells, without terminal calyptra (but rarely with conical plasmatic protrusions). Cells pale blue-green, yellowish or pinkish, able to produce facultative gas vesicles; aerotopes are localized at the ends of cells, or united into long, large, central aerotope; thylakoids sometimes slightly waved, localized parallely along the cell walls. Phycobiline composition changeable (with unstable phycoerythrin/phycocyanin ratio). Known involution cells. No toxic strains. Heterocytes and akinetes absent. |
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| Reproduction strategies, life cycles, cell division: Komárek (1992): All cells capable to divide (crosswise binary fission), daughter cells grow into the original size before next division. Reproduction by the fragmentation of trichomes without help of necridic cells, hormogonia immotile (or facultatively motile ?). |
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| Taxonomic position, higher hierarchy: Cyanophyceae, Oscillatoriales, Pseudanabaenaceae, Pseudanabaenoideae Notes to taxonomy, misinterpretations: probably more described as Oscillatoria- or Lyngbya- taxa. |
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| Ecology, ecophysiology, ecological significance: Komárek (1992): Planktic or tychoplanktic species, occurring in freshwater, mesotrophic up to eutrophic reservoirs (lakes, ponds, artificial valley reservoirs). The most common type species (L. redekei) is distributed all over the temperate zones, the founds from tropical countries must be revised. The distribution of different species is not quite clear because of many misidentifications by authors. More known are species from temperate zone. |
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| List of species: typical planktic types Limnothrix bicudoi Azevedo et al. 2003 Limnothrix meffertae Anagnostidis 2001 Limnothorix obliqueacuminata (Skuja) Meffert 1988 Limnothrix planktonica (Woloszyńska) Meffert 1988 Limnothrix redekei (Van Goor) Meffert 1988 Limnothrix vacuolifera (Skuja) Komárek et al. 2002 benthic and metaphytic types Unclear taxa |
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Drawings: Komárek 1992
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