Surirella suecica
Grunow in Van Heurck 1881 Category: Surirelloid
BASIONYM: Surirella suecica Grunow in Van Heurck 1881
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Jonathan English - February 2011
Length Range: 14-34 µm
Width Range: 7-9.5 µm
Striae in 10 µm: 30-36
Description
Valves 14-34 µm long by 7-9.5 µm wide, with a length-width ratio between 2 and 3.6. Valves generally clavate, although some have linear or constricted midsections that abruptly become pointed near the footpole. The headpole is broadly rounded while the footpole is acutely wedge-shaped and frequently capitate. Costae extend from the valve margins to the apical axis, 30-36 in 10 µm and rarely visible in the LM. Between the costae 2-3 rows of areolae exist, which are only visible in the SEM. Indentations in the valve face are present around the circumference of the valve, having the appearance of large areolae in the LM. Fibulae are short and marginal, 9-12 in 10µm.
Original Description
Basionym: Surirella suecica
Author: Grunow in Van Heurck 1881
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
English, J. (2011). Surirella suecica. In Diatoms of the United States. Retrieved May 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/surirella_suecica
Species: Surirella suecica
Contributor: Jonathan English
Reviewer: Sam Rushforth
Image Credit: Jonathan English, Marina Potapova
- Keel low, alar wings absent
- Valves 14-34 µm long, 7-9.5 wide
- Costa density high
- Valves narrow, clavate
- Fibulae short
Valves are heteropolar, narrow and clavate, with size ranges of 14-34 µm long and 7-9.5 µm wide. The density of costae is high (30-36 in 10 µm), so costae may not be visible in LM. Fibulae are short, and number 9-12 in 10 µm.
Compare
Surirella suecica is easily distinguished from S. angusta; S. suecica is heteropolar while S. angusta is isopolar. Surirella suecica differs from S. minuta by its clavate shape and higher stria density. In addition, the fibulae of S. suecica are shorter and do not extend to the apical axis.
Surirella angusta
Surirella minuta
Surirella stalagma
Citations
Costé, M. and M. Ricard. (1982). Contribution a l’étude des diatomées deau douce des Seychelles et de l’Ile Maurice. Cryptogamie: Algologie 3(4): 279-313.
Van Heurck, H. (1881). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers. pls 31-77.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 65055