Images
Click any image to enlarge...
LM image scalebar = 10 µm = 72 pixels
SEM image scalebar = 1 µm
Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 10-18 |
| Width: | 3-4.5 |
| Striae: | 22-26 |
Description:
Valve margin linear to slightly gibbous in the center with rounded valve ends. Axial area strongly lanceolate in center, widening at distal valve ends. Central area elliptical to lanceolate and unornamented. Raphe linear and simple. Proximal and distal raphe ends curve slightly in opposite directions. Striae are slightly more widely spaced in the central valve. Striae are parallel throughout the valve face.
| Morphology: | Naviculoid |
|---|---|
| Distribution: | South Victorialand endemic |
Autecology:
Notes:
We observe four distinct valve morphologies in diatoms within the species of Chamaepinnularia found in the McMurdo Dry Valleys: undulate, capitate, linear, and spathulate valve margins. Although these morphs have been described as Navicula cymatopleura West et West, N. deltaica Kellogg et Kellogg, N. quaternaria Kellogg et Kellogg and referred to as Pinnularia cymatopleura var. #3 (Spaulding et al. 2005) respectively, we considered the taxa to be synonyms of P. cymatopleura (Spaulding et al. 1997). Examination of populations in Northern Victorialand showed no discontinuities between morphometic measurements that would indicate discrete populations (Cavacini et al. 2006). Based on the same paper, it appears that no type slides exist for any of the three taxa. Cavacini et al. imply that a type specimen for C. cymatopleura does not exist, because they reported slides from West and West where C. cymatopleura was found, but not the type slides or locations. It also appears that type slides for N. deltaica and and N. quaternaria were not deposited at ANSP, as reported in Kellogg et al. (1980). Although these morphs do not appear to be distinct species, they occur at different sites in the streams of the McMurdo Dry Valleys. We continue to separate the morphs in our ecological analyses, because they may indicate differing responses to environment, and are therefore useful in ecological analyses.
McMurdo Dry Valleys Waterbodies with Chamaepinnularia deltaica
- Adams Stream
- Aiken Creek
- Bowles Creek
- Canada Glacier
- Canada Stream
- Coast Lake
- Commonwealth Glacier
- Commonwealth Stream
- Crescent Stream
- Delta Stream
- Green Creek
- Harnish Creek Tributary
- Lawson Creek
- Little Sharpe
- Lost Seal Stream
- McKay Creek
- Miers Stream
- Onyx River
- Priscu Stream
- Taylor Glacier
- Von Guerard Stream
- Wharton Creek
- Wormherder Creek
Original Type Description
| Author: | Kellogg 1980 |
|---|---|
| Length: | 13-19 |
| Width: | 4-6 |
| Striae: | 18 |
Original Description:
Navicula. minuta; valvis lineari-ellipticis cum polis obtuse rotundatis; platea axialis lata; platea centrailis latior; striis ca. 18 in 10 µm, brevibus et raditatis circum polis, in parte mediana (adversus plateam centralem) brevioribus et valde rectus. Long ca. 13-19 µm; lat. 4-6 µm.
New combination
| Author: |
|---|
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):
- Kellogg et al. 1980. p. 176, Pl. 2, fig. 13. [citation 64(123)]
