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Encyonema lange-bertalotii

Krammer 1997      Category: Asymmetrical biraphid

REPORTED AS: Cymbella silesiaca (Krammer and Lange-Bertalot 1986, plate 117, figs 18-20) 

Encyonema hebridicum


Encyonema latum

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - May 2016
Length Range: 18-32 µm
Width Range: 6.6-8.3 µm
Striae in 10 µm: 14-16


Valves are strongly dorsiventral with curved, subrostrate apices. Apices are oriented ventrally such that the junction between the dorsal margin and the apex is a continuous arc. The dorsal margin is strongly arched. The ventral margin is slightly convex. The axial area is narrow. The central area is a slightly wider continuation of the axial area. The raphe is filiform. Proximal raphe ends are deflected dorsally and terminate in inconspicuous central pores. Terminal raphe fissures are deflected ventrally. Striae are radiate on the dorsal side, a bit farther apart at the valve center than near the apices. The median stria on the dorsal side is next to a signle single isolated areola. The very short striae on the ventral side are parallel at the valve center, then radiate, and finally convergent toward the apices. Areolae in the striae may be resolved in LM and number 30-35 in 10 µm.

Original Description

Author: Krammer 1997
Length Range: 16-38 µm
Width Range: 6.2-11.0 µm
Striae in 10 µm: 14-16

Original Description

Original Images

Cite This Page:
Bahls, L. (2016). Encyonema lange-bertalotii. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Encyonema lange-bertalotii

Contributor: Loren Bahls

Reviewer: Diane Winter


Krammer, K. (1997). Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines und Encyonema. Bibliotheca Diatomologica 36: 1-382.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Encyonema lange-bertalotii CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

The specimens shown on this web page were collected from a stream in Glacier National Park, Montana. Streams in the park typically have low nutrient concentrations, low electrical conductivity, and slightly alkaline pH.