Simonsenia delognei
Lange-Bertalot 1979 Category: Nitzschioid
BASIONYM: Nitzschia delognei Grunow in Van Heurck 1885
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Carrie Graeff - October 2012
Length Range: 9.5-14.5 µm
Width Range: 2.5 µm
Striae in 10 µm:
Description
The valves are small and lanceolate or linear-lanceolate with apices that are extremely narrowly rounded and often protracted. The striae are generally biseriate but become multiseriate and disorganized near the raphe canal. The striae are not resolvable in the LM, but the presence of transapical costae gives the valves the appearance of having resolved striae. The costa density is 18 in 10 microns.
Original Description
Basionym: Nitzschia delognei
Author: Grunow in Van Heurck 1885
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Graeff, C. (2012). Simonsenia delognei. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/simonsenia_delognei
Species: Simonsenia delognei
Contributor: Carrie Graeff
Reviewer: Sarah Spaulding
Image Credit: Carrie Graeff
- Valve apices extremely narrow, often protracted
- Costae 18 in 10 µm
The valves of S. delognei have extremely narrow apices that are often protracted. The costa density is 18 in 10 µm.
Compare
Simonsenia delognei does not have true fibulae and its striae are not resolved in the LM, while Nitzschia valdecostata has fibulae and resolved striae. Simonsenia delognei also has narrower valves with finer, more protracted apices.
Nitzschia valdecostata
Citations
Lange-Bertalot, H. (1979). Simonsenia, a new genus with morphology intermediate between Nitzschia and Surirella. Bacillaria 2: 127-136.
Van Heurck, H. (1885). Synopsis des Diatomées de Belgique. Texte. Martin Brouwers & Co., Anvers. p. 157. (description).
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 59001