Cymatopleura internationale

Bahls 2013      Category: Surirelloid

Cyclotella quillensis


Cymatopleura solea

LM scalebar = 10 µm = 20 pixels.


Contributor: Loren Bahls - October 2012
Length Range: 54-72 µm
Width Range: 31-39 µm
Striae in 10 µm: 8-18


Valves are elliptic with short apiculate apices. One to 3, but typically 2, undulations are evident across the valve face. Fibulae are regularly spaced and number 8-9 in 10 µm. The raphe is contained in a canal along the margin of the valve. Striae are irregular, often disorganized, and composed of areolae of variable size and shape. Areolae number 10-15 in 10 µm.

Original Description

Author: Bahls 2013
Length Range: 54-72 µm
Width Range: 31-39 µm
Striae in 10 µm: 8-18

Original Description

Valves elliptic with short apiculate apices. Valve length 54–72 μm; valve width 31–39 μm. One to 3 (typically 2) undulations evident across the valve face. Marginal ribs regularly spaced, 8–9 in 10 μm. Striae very irregular, often disorganized, 8–18 in 10 μm. Areolae of variable size and shape, 10–15 in 10 μm.

Original Images

Cite This Page:
Bahls, L. (2012). Cymatopleura internationale. In Diatoms of the United States. Retrieved April 19, 2018, from

Species: Cymatopleura internationale

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Bahls, L. (2013). New diatoms (Bacillariophyta) from western North America. Phytotaxa 82(1): 7-28.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

Cymatopleura internationale is known only from the type locality, the southern shoreline of Waterton Lake at Goat Haunt in Glacier National Park, Montana. On the date this sample was collected (22 July 2009), water temperature was 19.7 C, pH was 8.53, and specific conductance was 133 µS/cm.


The Canadian tour boat International docked at Goat Haunt on the American end of Waterton Lake in the Waterton/Glacier International Peace Park. The type sample for Cymatopleura internationale was collected along the shoreline at left.

Credit/Source: Loren Bahls