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LM image scalebar = 10 µm = 38 pixels
SEM image scalebar = 2 µm
Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 33-44 micrometers |
| Width: | 5-7 micrometers |
| Striae: | 24-26 per 10 micrometers at the center |
Description:
Valves linear with produced, capitate ends, slightly flexed towards the dorsal side. Dorsal side parallel to slightly convex; ventral side modestly concave. Valve length 33-44 µm, width 5-7 µm. Raphe positioned on the ventral valve margin. Striae composed of small areolae, 24-26 in 10 µm. Striae evenly spaced although some valves have wider spacing of striae at mid-valve. Striae somewhat curved near the ends. Fibulae variable in size and spacing; ranging from 6-12 in 10 µm. SEM: Internally, striae are punctate and extend to the distal valve ends. Thickening of the valve mantle at the capitate valve ends is visible. Fibulae are variable in number in relation to striae (cover 1-4 striae), and are positioned internally to the raphe.
| Morphology: | Nitzschioid |
|---|---|
| Distribution: | South Victorialand endemic |
Autecology:
Notes:
Hantzschia amphioxys f. muelleri should be compared with Hantzschia amphioxys (Ehrenberg) Grunow and H. abundans Lange-Bertalot, but differs in having strongly capitate endings, finer striae (24-26 in 10 µm in f. muelleri vs. 15-20 in H. abundans), and more parallel valves than both previously mentioned species. H. amphioxys has a larger length to width ratio than H. amphioxys f. muelleri, and H. abundans has longer valves (40-80 µm). This species was originally described by Müller (1909) as H. amphioxys f. capitata, and renamed because of priority of the name H. amphioxys var. capitata Pantosek for a different organism (Ko-Bayashi 1965). Similarly, H. amphioxys var. compacta f. capitata Manguin 1952 is a later homonym. Our specimens exhibit a restricted size range (33-44 µm) as compared to the range reported by Ko-Bayashi (20-120 µm). Ko-Bayashi (1965) illustrates the considerable range in morphology of this and other Antarctic Hantzschia taxa. He implies relationships between Antarctic species based on morphological similarity. This species has been reported from East Ongul Island (Ko-Bayashi 1965) and the Patagonian region of South America (Müller 1909).
McMurdo Dry Valleys Waterbodies with Hantzschia amphioxys f. muelleri
- Adams Stream
- Aiken Creek
- Bowles Creek
- Canada Stream
- Commonwealth Stream
- Crescent Stream
- Delta Stream
- Green Creek
- Harnish Creek
- Harnish Creek Tributary
- Huey Creek
- Lawson Creek
- Little Sharpe
- Lost Seal Stream
- Lyons Tributary (Mason?)
- Many Glaciers Pond
- Miers Stream
- Onyx River
- Picture Pond
- Pony Lake
- Priscu Stream
- Spaulding Pond
- Von Guerard Stream
- Wharton Creek
- Wormherder Creek
Original Type Description
| Author: | Ko-Bayashi 1965 |
|---|---|
| Length: | |
| Width: | |
| Striae: |
Original Description:
New combination
| Author: |
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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).
Publications (by year):
- Cleve-Euler 1955. p. 51, fig. 1420 r. [citation 29(8)]
- Lange-Bertalot 1993. Taf. 103, fig. 3. [citation 82(67)]
- Esposito et al. 2008. Botany 86: 1378-1392. [citation 137(130)]
