Navicula seibigiana
Lange-Bertalot 1993 Category: Symmetrical biraphid
BASIONYM: Navicula seibigiana Lange-Bertalot 1993
REPORTED AS: Navicula species 3 (Krammer and Lange-Bertalot 1986, Fig. 38: 21) | Navicula seibigii (Krammer and Lange-Bertalot 1991 & 2004, Fig. 63: 1-6)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Loren Bahls - April 2012
Length Range: 26-29 µm
Width Range: 5.2-5.8 µm
Striae in 10 µm: 11-12
Description
Valves are lanceolate with slightly protracted, broadly rounded apices. The axial area is narrow and linear. The central area is small and bordered on each side by one or two short striae. The raphe is filiform with inflated proximal ends. Striae are robust, strongly radiate in the middle, becoming abruptly parallel then convergent near the ends. Areolae are fine and number 34-38 in 10 µm.
Original Description
Basionym: Navicula seibigiana
Author: Lange-Bertalot 1993
Length Range: 25-35 µm
Width Range: 5.5-6.5 µm
Striae in 10 µm: 9-11
Original Description
Valves elliptic-lanceolate to linear-lanceolate, ends often slightly protracted for a short distance, very obtusely to almost broadly rounded, length 25-35 µm, breadth 5.5-6.5 µm. Raphe branches filiform with very distinct central pores. Axial area narrow, linear, central area irregularly bordered on both sides due to the shortening of one or two striae, almost rectangular, only slightly enlarged. Striae fairly strongly radiate in the middle, then abruptly parallel, becoming convergent, 9-11/10 µm; lineolae c. 36/10 µm.
Original Images
Cite This Page:
Bahls, L. (2012). Navicula seibigiana. In Diatoms of the United States. Retrieved February 27, 2015, from http://westerndiatoms.colorado.edu/taxa/species/navicula_seibigiana
Species: Navicula seibigiana
Contributor: Loren Bahls
Reviewer: Sarah Spaulding
Image Credit: Sarah Spaulding
- Striae radiate in center
- Striae convergent near apices
- Striae robust
- Central striae shortened
Valves are 5-6 µm wide with robust striae that number 11-12 in 10 µm. Striae are radiate in the middle, becoming abruptly convergent near the apices. The central 1 or 2 striae are shortened.
Compare
Navicula tenelloides has narrower valves and a higher stria density. Navicula libonensis has a larger central area and higher stria density.
Navicula libonensis
Navicula tenelloides
Hustedt 1937
Citations
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.
Lange-Bertalot, H. (1993). 85 Neue taxa und uber 100 weitere neu definierte Taxa erganzend zur Subwasserflora von Mittleuropa. Bibliotheca Diatomologica 27, 454 p. Cramer, Berlin, Stuttgart.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46870
Autecology Discussion
Navicula seibigiana has been recorded from 55 ponds and small streams in the Pacific Northwest, where it is present in small numbers. In these waters mean water temperature is 9.3 degrees C, mean pH is 7.6, and mean specific conductance is 120 µS/cm.
Images
Blakiston Beaver Pond A, Waterton Lakes National Park, Alberta: home of Navicula seibigiana.
Credit/Source: Barb Johnston, Parks Canada.