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LM image scalebar = 10 µm = 72 pixels
Observations
| Observations: | S. Spaulding & R. Esposito |
|---|---|
| Length: | 15-31 µm |
| Width: | 8-11 µm |
| Striae: | 14-18 in 10 µm |
Description:
Valve distinctly capitate; possibly with one lateral margin slightly convex and the other parellel (although this does not appear to be a consistent character). Axial area present, widening towards the central region of the valve. Central area an acute-angled sub-fascia, usually with a single row of poroids around the outer edge. A solitary stigma present on the sub-fascia. Raphe straight; median and terminal raphe endings slightly hooked in the opposite direction of the stigma. Striae radiate throughout, consisting of 3-5 distinct puncta except in the median portion of the valve and at the poles.
| Morphology: | Naviculoid |
|---|---|
| Distribution: | Antarctic endemic |
Notes:
The strongly capitate endings, the greater width of the valves, and the acute-angled sub-fascia separate this form from the nominate variety. Striae were originally described as 13-14 in 10 µm by Carlson (1913) and subsequently by Kellogg et al. (1980). However, striae counts in this study (15-18 in 10 µm) agree more closely with those of Ko-Bayashi (1965). Both Hustedt (1961-1966) and Kellogg et al. (1980) make arguements for placing this form in synonymy with Navicula muticopsis. However, Ko-Bayashi (1965) argues that form capitata should be upheld as a different form based on the unique valve shape (i.e. the one convex margin and the one parallel margin). Although the parallel/convex margin does not appear to be a consistent character, capitata appears to be is a unique form of L. muticopsis based upon the strongly capitate endings and acute-angled sub-fascia.
Waterbodies with Luticola muticopsis fo. capitata
- Aiken Creek
- Bowles Creek
- Canada Stream
- Delta Stream
- Green Creek
- Harnish Creek Tributary
- Lake Fryxell
- Von Guerard Stream
Original Type Description
| Author: | Carlson 1921 |
|---|---|
| Length: | 15-29 µm |
| Width: | |
| Striae: | 13-14 in 10 µm |
Original Description:
Valva elongata, apicibus distincte capitatis. Obenstehende drei Typen gehen ohne Grenze in einander über. Die Länge der Schalen ist 15-29 µm, wobei die kürzeren Formen der f. reducta, die längeren der f. evoluta und f. capitata angehören. Das Verhältnis Länge: Breite schwankt zwischen 5:3 (bei f. reducta) und 3:1. Die Form des mittleren streifenlosen Feldes kann auch wechseln, wie W. und F.S. West es angeben (a.a.O.); doch fand ich, dass die annähernd rektanguläre Form die gewöhnlichste ist. Von Querstreifen zählte ich, wie W. und G.S. West, immer 13-14 auf 10 µm; nach der Diagnose H. Van Huercks (a.a.O.) kommen nur 10 auf 10 µm, aber nach seiner Figur 12-13. Schalen, und zwar immer in der gleichen Lage.
New combination
| Author: | Mann, D.G. 1990 |
|---|
Citations
Index Nominum Algarum (INA):
- 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):
- Carlson 1913. p. 14, pl. 1, fig. 21. [citation 25(110)]
- Ko-Bayashi 1965. p. 24-34, pl. 26-31 [citation 69(43)]
- Kellogg et al. 1980. p. 183, pl. 1, fig. 12 [citation 64(29)]
- Mann 1990. In Round et al., The Diatoms, pg. 671. [citation 104(86)]
