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LM image scalebar = 10 µm = pixels not measured
Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 11-25µm |
| Width: | 4-5,5µm |
| Striae: | 29-34 striae in 10µm |
Description:
Valves linear, convex in the middle with subcapitate, rounded ends (L 11-25µm, W 4-5,5µm, 29-34 striae in 10µm). Transapical striae slightly radiate, parallel near the largest width and convergent near the poles. Hyaline area bordering the striae much larger than the striae. Axial area relatively broad, linear, widened in the median part and convergent near the poles. Central area elliptical, bordered by 6-7 short striae. Raphe straight, filiform with indistinct pores.
| Morphology: | Naviculoid |
|---|---|
| Distribution: |
Autecology:
Notes:
Rare in several dry soil samples (<33%) with low nutrient and specific conductance values. Distribution in water and moss samples is rather obscure due to confusion with larger valves of D. ingeae and D.costei, although only a few valves have been found each time.Kerguelen (Heiden & Kolbe 1928, Bourrelly & Manguin 1954, Larson 1974, Le Cohu & Maillard 1986, Van de Vijver et al. 1998a, 2001),King George Island (Schmidt et al. 1990).The valves shown in Rumrich et al. (2000) do absolutely not belong to D. arcuata, based on the structure of the raphe and the general outline of the valves. D. arcuata is easily confused with D. costei, that has divergent striae near the poles and D. ingeae, that is much smaller. It is possible that other taxa, derived from D. arcuata still have to be described.
Other sites with Diadesmis arcuata
- Ile de la Possession (moist habitats), Crozet Archipelago
Original Type Description
| Author: | Heiden |
|---|---|
| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
| Author: | Lange-Bertalot 1992 |
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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).
