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LM image scalebar = 10 µm = 72 pixels
SEM image scalebar = 1 µm
Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 20-32 µm |
| Width: | 3.5-5 µm |
| Striae: | 24-26 in 10 µm in the center; 26-30 in 10 µm at the ends |
Description:
Valve margin elongate and asymmetrical to the apical axis. Dorsal margin is convex; ventral margin is slightly gibbous. Ends are capitate. Raphe straight and adjacent to the ventral margin; central raphe poles are distantly spaced; distal raphe ends hooked toward the dorsal margin. No striae visible in LM on the ventral side of the raphe. Striae form longitudinal lines on the dorsal side that are more widely spaced in the central part of the valve.
| Morphology: | Amphoroid |
|---|---|
| Distribution: | Widespread |
Autecology:
Notes:
This diatom was originally described as taxon of A. veneta var. capitata by Haworth (1974). It was subsequently raised to the species rank by Lange-Bertalot & Metzeltin (1996). The specimens encountered in this study conform to the description given by Haworth (1974), although the distal raphe ends are hooked towards the dorsal margin, a feature not noted by Haworth.
McMurdo Dry Valleys Waterbodies with Amphora cf. oligotraphenta
- Aiken Creek
- Blue Lake
- Bowles Creek
- Canada Stream
- Commonwealth Stream
- Delta Stream
- Green Creek
- Harnish Creek Tributary
- Hughes Glacier Pond
- Lost Seal Stream
- Many Glaciers Pond
- Miers Stream
- Onyx River
- Picture Pond
- Pond South of Nussbaum Riegel
- Spaulding Pond
- Von Guerard Stream
- Wharton Creek
Original Type Description
| Author: | Haworth 1974 |
|---|---|
| Length: | 20-35 µm |
| Width: | 3.5-4.5 µm |
| Striae: | 26-30 in 10 µm |
Original Description:
Amphora veneta var. capitata differs from var. veneta in the elongate shape of the valve and in poscessing distinctive capitate ends. Frustule narrowly elliptical, 20-35 µm long, 10 µm broad, with several intercalary bands. Valve long and cymbelloid, 3.5-4.5 µm broad, with capitate apices, the dorsal margin is convex while the ventral one is slightly concave. The raphe is close to the ventral margin and the central pores are distant from one another, which is a characteristic of the spcies. There are no striae on the ventral side and those on the dorsal consist of elongate punctae forming irregular longitudinal lines. The striae are more widely space around the central area than they are towards the apices, about 26-30 in 10 µm.? Type locality: Loch Leven
New combination
| Author: | Lange-Bertalot & Metzeltin 1996 |
|---|
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).
Publications (by year):
- Haworth 1974. p. 48, Fig. 6 [citation 45(14)]
- Lange-Bertalot and Metzeltin 1996. p. 28, Taf. 96, Fig. 21-22 [citation 80(63)]
