Images
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LM image scalebar = 10 µm = 72 pixels
SEM image scalebar = 1 µm
Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 6-20 µm |
| Width: | 2-4 µm |
| Striae: | 30-36 in 10 µm |
Description:
Valve linear, slightly gibbous in the center; poles somewhat swollen and rounded. Axial area small or indistinct. Central area wide, generally rounded, and often with a thickening of the valve beneath the central area (see Round et al., 1990 for SEM illustrations of this feature). Raphe straight with simple endings. Striae linear and composed of elongate puncta.
| Morphology: | Naviculoid |
|---|---|
| Distribution: | Widespread |
Autecology:
Notes:
The raphes of this diatom are often filled with silica, producing valves that, under the light microscope appear to lack a raphe system. This taxon is often seen in girdle view, chains of many cells linked together as filaments. This taxon was formally identified as Diadesmis contenta, and revised in light of SEM observations on 5 August 2014.
McMurdo Dry Valleys Waterbodies with Humidophila arcuata
- Adams Stream
- Aiken Creek
- Bowles Creek
- Canada Glacier
- Canada Stream
- Commonwealth Glacier
- Commonwealth Stream
- Crescent Stream
- Delta Stream
- Green Creek
- Harnish Creek Tributary
- Huey Creek
- Lake Fryxell
- Lawson Creek
- Little Sharpe
- Lost Seal Stream
- Lyons Tributary (Mason?)
- McKay Creek
- Miers Stream
- Onyx River
- Priscu Stream
- Von Guerard Stream
- Wales Stream
- Wharton Creek
- Wormherder Creek
Original Type Description
| Author: | Heiden 1928 |
|---|---|
| Length: | 7-10 µm |
| Width: | 2-2.5 µm |
| Striae: | 36 in10 µm |
Original Description:
Valve linéaire, renflée à la partie médiane et aux extrémités. Raphé entouré d?une zone hyaline notable, à peine un peu dilatée près du nodule median. Stries très-délicates, à peu près parallèles, environ 36 en 1 c.d.m. Longueur 0.7 à 1 c.d.m. Largeur 0.2 à 0.025 de c.d.m.
New combination
| Author: | Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová 2014 |
|---|
Citations
Index Nominum Algarum (INA):
- Original
- New Combination
- 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).
Publications (by year):
- Hustedt 1930. p. 277, pl. 458, fig. a [citation 51(21)]
- Kellogg et al. 1980. p. 180, Pl. 1, fig. 26. [citation 64(26)]
- Mann 1990. In Round et al. The Diatoms, pg. 666. [citation 104(83)]
