Synedra famelica

Kütz. 1844      Category: Araphid

REPORTED AS: Fragilaria famelica (Krammer and Lange-Bertalot 1991) 

Synedra cyclopum


Synedra goulardi

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - June 2012
Length Range: 18-65 µm
Width Range: 2.4-3.1 µm
Striae in 10 µm: 18-20


Valves are narrow and linear, not swollen in the middle, with gradually tapered and rounded apices. Axial area is straight and very narrow. Central area is ovoid, often offset to one side of the valve and with ghost striae. Short striae are typically found at one or both sides of the central area. Striae are parallel throughout. Areolae are coarse and easily resolved in LM.

Original Description

Author: Kütz. 1844
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Synedra famelica. In Diatoms of the United States. Retrieved April 24, 2018, from

Species: Synedra famelica

Contributor: Loren Bahls

Reviewer: Rex Lowe


Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.

Kützing, F.T. (1844). Die kieselschaligen Bacillarien oder Diatomeen. Nordhausen. 152 pp., 30 pls.

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)

Original INA

California Academy of Sciences (CAS)

Synedra famelica CAS

NCBI Genbank Taxonomy

Fragilaria famelica NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 66005

Autecology Discussion

Synedra famelica forms tufted colonies with frustules joined at one end by mucilage pads (see photo below). This species is widespread and locally abundant in streams and wetlands on the Northwestern Great Plains (Montana, North Dakota, Wyoming). Here it prefers nutrient-rich, sodium-sulfate waters with elevated conductivity (see table below).


Tufted colony of Synedra famelica in a sample (Montana Diatom Collection No. 344301) collected from Corral Creek in Big Horn County, Montana.

Credit/Source: Loren Bahls

Charlie Creek, Richland County, Montana: home of Synedra famelica.

Credit/Source: Loren Bahls

Abundance-weighted means for selected water quality variables measured concurrently with the collection of samples containing Synedra famelica.

Credit/Source: Montana Diatom Database