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Observations
| Observations: | Sarah Spaulding and Rhea Esposito |
|---|---|
| Length: | 14-22 |
| Width: | 4-5 |
| Striae: | 20-26 |
Description:
Valve margin linear to lanceolate with subcapitate valve ends. Axial area large and strongly lanceolate in center, widening at distal valve ends. Central area elliptical to lanceolate and unornamented. Raphe linear and simple. Proximal raphe ends are straight and distal raphe ends curve very slightly in opposite directions. Striae are evenly spaced. Striae radiate slightly in the central valve, and are parallel at distal ends.
| 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 quaternaria
- Adams Stream
- Aiken Creek
- Bowles Creek
- Canada Stream
- Coast Lake
- Commonwealth Stream
- Delta Stream
- Green Creek
- Harnish Creek Tributary
- Lawson Creek
- Lost Seal Stream
- McKay Creek
- Miers Stream
- Onyx River
- Priscu Stream
- Taylor Glacier
- Von Guerard Stream
- Wales Stream
- Wharton Creek
- Wormherder Creek
Original Type Description
| Author: | Kellogg 1980 |
|---|---|
| Length: | 18-29.5 |
| Width: | 4-6 |
| Striae: | 20 |
Original Description:
Navicula minuta; valvis sublinearis cum polis subcapitatis et parte mediana minime dialata; platea axialis lata; platea centralis latior;striis 20 in 10um brevibus et radiatis circum polis, in parte mediana berviorbus et valde rectis. Long ca 18-29 um, lat ca. 4-6 um.
New combination
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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).
