Sellaphora bacilloides

(Hustedt) Levkov, Krstic and Nakov 2006      Category: Symmetrical biraphid
BASIONYM: Navicula bacilloides Hustedt 1945

Sellaphora americana


Sellaphora bacillum

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - February 2012
Length Range: 30-35 µm
Width Range: 10.0-12.6 µm
Striae in 10 µm: 18 (center) -26 (ends)


Valves are elliptic with bluntly rounded, subtly protracted apices. The axial area is very narrow. The central area is circular and about half the width of the valve. Proximal raphe ends are dilated, straight and extend into the central area. Striae are radiate; they are shorter and more widely spaced about the central area. Areolae are very fine and number about 40 in 10 µm.

Original Description

Basionym: Navicula bacilloides
Author: Hustedt 1945
Length Range: 20-30 µm
Width Range: 10-11 µm
Striae in 10 µm: 22-24

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Sellaphora bacilloides. In Diatoms of the United States. Retrieved October 04, 2015, from

Species: Sellaphora bacilloides

Contributor: Loren Bahls

Reviewer: Rex Lowe


Hustedt, F. (1945). Diatomeen aus Seen und Quellgebieten der Balkan-Halbinsel. Archiv für Hydrobiologie 40(4):867-973.

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.

Levkov, Z., Nakov, T. and Metzeltin, D. (2006). New species and combination from the genus Sellaphora Mereschkowsky from Macedonia. Diatom Research 21 (2): 297-312.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Sellaphora bacilloides CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46490

Autecology Discussion

There are 23 records of Sellaphora bacilloides in the Montana Diatom Collection, from lakes and low-gradient streams in arid regions throughout the Northwest United States. This uncommon species prefers alkaline waters (mean pH = 7.8) with somewhat elevated electrolytes (mean specific conductance = 689 µS/cm).


Little Dry Creek at Flowing Well, Garfield County, Montana: home of Sellaphora bacilloides.

Credit/Source: Loren Bahls