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SEM image scalebar = 5 µm
Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 49-94 µm |
| Width: | 7-9.5 µm |
| Striae: | 18-20 in 10 µm at the center; 19-22.5 in 10 µm at the ends |
Description:
Valves linear-lanceolate, narrowing towards the produced, capitate endings which are flexed outwards (i.e. valve mantle is concave); dorsal margin parallel to slightly convex; ventral margin slightly concave. Raphe eccentric, stretching along the valve margin and biarcuate (closer to the ventral margin centrally than near the poles); proximal raphe ending continuous (i.e. unbroken raphe slit) and deflected towards the ventral margin; distal raphe endings hooked towards the dorsal margin. Raphe canal slightly thickened in the central portion of the valve. Striae more widely spaced at the center of the valve; striae slightly radiate in the center, becoming parallel to convergent towards the ends. Fibulae (keel puncta) variable in size and spacing. Ko-Bayashi (1965) appears to have identified this same diatom which he calls Hantzschia amphioxys var. linearis. However, the original description for var. linearis is with a length of 143-172 micrometers, and therefore, it does not appear that this was an accurate assessment by Ko-Bayashi. Lange-Bertalot (1993) has illustrated a similar looking diatom which he calls Hantzschia species cf. abundans cf. vivacior (Figs. 4-5). S.E.M. examination of the specimens collected in this study indicates that the valves externally resemble Hantzschia vivacior (synonym H. vivax) and internally resemble Hantzschia abundans sensu Lange-Bertalot (1993). Thus, it appears that this is a new species of Hantzschia, closely related to H. vivacior and H. abundans.
| Morphology: | Nitzschioid |
|---|---|
| Distribution: | Widespread |
Autecology:
Notes:
McMurdo Dry Valleys Waterbodies with Hantzschia abundans
- Adams Stream
- Aiken Creek
- Bohner Stream
- Bowles Creek
- Canada Stream
- Commonwealth Stream
- Crescent Stream
- Delta Stream
- Garwood Stream
- Green Creek
- Harnish Creek
- Harnish Creek Tributary
- Huey Creek
- Lawson Creek
- Little Sharpe
- Lost Seal Stream
- Miers Stream
- Onyx River
- Priscu Stream
- Von Guerard Stream
- Wales Stream
- Wharton Creek
- Wormherder Creek
Original Type Description
| Author: | Lange-Bertalot 1993 |
|---|---|
| Length: | 40-80 µm |
| Width: | 7-10 µm |
| Striae: | 15-20 in10 µm |
Original Description:
Frusula atque valvae ad instar generaliter sicut typica in pluribus specibus generis Hantzschia, circiter 40-80 µm longae, 7-10 µm latae. Fibulis circiter 5-8 in 10 µm, mediis subremotis stiis transversis 15-20 in 10 µm. REM: Fibulae non sive paullo elongate (dentiformes), Carina raphis paullo super planitiem et limbum valvae elevata. Fines proximi interni ramorum raphis unilateraliter declinati nec divergentes; fines proximi externi recti, valde interuppti non declinati nec deflexi. Areolae circiter 40 in 10 µm
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):
- Ko-Bayashi 1965. p. 13-16, figs 15-18. [citation 69(41)]
- Lange-Bertalot 1993. p. 74-87, Taf. 109, figs 4,5. [citation 82(66)]
