Sellaphora bacillum
(Ehrenberg) D.G. Mann 1989 Category: Symmetrical biraphid
SYNONYM(S): Diadesmis bacillum (Ehrenberg) Kützing 1844 | Pinnularia bacillum (Ehrenberg) Ehrenberg 1876 | Schizonema bacillum (Ehrenberg) Kuntze 1898
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 30-45 µm
Width Range: 9-10 µm
Striae in 10 µm: 12-14
Description
Valves are linear-elongate with rounded apices. The axial area is straight and bordered by a distinct hyaline conopeum. The raphe is straight with rounded and slightly dilated proximal external ends. The distal ends are deflected onto the margin. T-shaped thickenings are present, but indistinct, near the ends. Striae are radiate and arched, becoming parallel at the apices. Striae are broadly spaced at the center of the valve, and become finer (to 22 in 10 µm) at the ends.
Cite This Page:
Kociolek, P. (2011). Sellaphora bacillum . In Diatoms of the United States. Retrieved June 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/sellaphora_bacillum
Species: Sellaphora bacillum
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves linear-elongate
- Length 30-45 µm
- Axial area bordered by a distinct, hyaline conopeum
Valves are linear-elongate with apices rounded. The axial area is bordered by a distinct, hyaline conopeum. The striae are broadly spaced at the center of the valve and become much finer (to 22 in10 µm) at the ends.
Compare
This species is smaller, has smaller axial area and possesses a conopeum, in comparison to S. americana. It is longer than S. pupula and the t-shaped thickenings near the apex are less distinct.
Sellaphora americana
(Ehrenberg) D.G. Mann 1989
Sellaphora pupula
(Kützing) Mereschkowsky 1902
Citations
Jahn, R., Mann, D.G., Evans, K.M. and Poulíčková, A. (2008). The identity of Sellaphora bacillum (Ehrenberg) D.G. Mann. Fottea 8: 121–124.
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.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 170009