Cymbopleura perprocera

Krammer 2003      Category: Asymmetrical biraphid

Cymbopleura oblongata


Cymbopleura rainierensis

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - January 2014
Length Range: 62-114 µm
Width Range: 19.6-25.1 µm
Striae in 10 µm: 8-9 at the valve center, 12-13 near the apices on the dorsal side


Valves are weakly dorsiventral and lanceolate with narrow beaked apices. The dorsal margin is more strongly arched than ventral margin, which may be nearly flat in the smallest specimens. The axial area is moderately wide, about one-fourth to one-third the width of the valve. The central area is rounded and slightly wider than the axial area. The raphe is lateral and narrows near the weakly expanded proximal ends, which are tipped slightly towards the ventral side. Distal raphe ends are bayonet-shaped and more or less straight. Striae are radiate, but become parallel very near the apices. Areolae in the striae are easily resolved in LM and number 16-22 in 10 µm.

Original Description

Author: Krammer 2003
Length Range: 84-124 µm
Width Range: 23-26 µm
Striae in 10 µm: 8-9 at the valve center, 15-16 near the apices on the dorsal side

Original Description

Original Images

Cite This Page:
Bahls, L. (2014). Cymbopleura perprocera. In Diatoms of the United States. Retrieved April 20, 2018, from

Species: Cymbopleura perprocera

Contributor: Loren Bahls

Reviewer: Kalina Manoylov


Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Cymbopleura perprocera CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Cymbopleura perprocera was described from material collected from a Sphagnum moor pond in northwest Finland. Krammer (2003) reports this species has a sporadic distribution in lakes of Finnish Lapland, where the water is low in nutrients and electrolytes. The specimens illustrated here were collected from Hoskins Lake, a lowland lake surrounded by conifer forest in northwest Montana (photo below). Here pH measured 7.6 and specific conductance measured 67 µS/cm on the day that C. perprocera was collected.


Hoskins Lake, Lincoln County, Montana: home of Cymbopleura perprocera.