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LM image scalebar = 10 µm = pixels not measured
Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 8,7-13,3µm |
| Width: | 2,7-4µm |
| Striae: | 35-39 striae in 10µm |
Description:
Valves linear to linear-elliptical in smaller forms with bluntly rounded, subcapitate ends (L 8,7-13,3µm, W 2,7-4µm, 35-39 striae in 10µm). Axial area very narrow, not resolvable in LM. Central area almost absent, sometimes weakly rounded. Raphe filiform, straight, with deflected terminal fissures and small, slightly bent central pores, close together. Transapical striae not visible in LM. In SEM, striae appear weakly radiate to even parallel in the middle, parallel to sometimes convergent towards the poles.
| Morphology: | Naviculoid |
|---|---|
| Distribution: |
Autecology:
Notes:
Common in small, acid to almost circumneutral pools with rather low specific conductance values (<200µS/cm). Also found in several very wet (>85%) soil samples. Rare in mosses.South Georgia (Van de Vijver & Beyens 1996). On the South Orkney Islands, N. difficillima Hustedt has been found, a taxon that bears some resemblances with N. arvensis but that shows thickenings at the apices.The exact taxonomical position of this taxon is still unknown. Therefore we still identify it as belonging to the genus Navicula, until the confusion around the arvensis-group has been clarified.
Other sites with Navicula arvensis
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Hustedt 1986 |
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| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
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Citations
Index Nominum Algarum (INA):
- Original
- If an INA link is available, it will be shown above
- The INA is a bibliographic reference "card file" for algal taxonomy, containing nearly 200,000 names of algae (in the broad sense).
