Encyonopsis subspicula

Krammer 1997      Category: Asymmetrical biraphid
BASIONYM: Encyonopsis subspicula Krammer 1997

Encyonopsis subminuta


Encyonopsis treinishii

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - May 2013
Length Range: 47.2-76.4 µm
Width Range: 5.7-8.6 µm
Striae in 10 µm: 16-20


Valves are lanceolate and weakly dorsiventral. Apices are gradually attenuated and rounded. The axial area is narrow. The central area is small and slightly wider than the axial area. The raphe is lateral, becoming filiform at the proximal and distal ends. Proximal raphe ends are deflected dorsally. Distal raphe fissures are curved toward the ventral margin. Striae are radiate, becoming parallel, then weakly convergent toward the apices. A single stigma lies at the proximal end of the median dorsal stria.

Original Description

Basionym: Encyonopsis subspicula
Author: Krammer 1997
Length Range: 45-77 µm
Width Range: 6.7-8.7 µm
Striae in 10 µm: 16-19

Original Description

Original Images

Cite This Page:
Bahls, L. (2013). Encyonopsis subspicula. In Diatoms of the United States. Retrieved November 27, 2015, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_subspicula

Species: Encyonopsis subspicula

Contributor: Loren Bahls

Reviewer: Pat Kociolek


Bahls, L. (2013). Encyonopsis from western North America: 31 species from Alberta, Idaho, Montana, Oregon, South Dakota, and Washington, including 17 species described as new. Northwest Diatoms, Volume 5. The Montana Diatom Collection, Helena, 46 pp.

Krammer, K. (1997). Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part., Encyonopsis and Cymbellopsis. Bibliotheca Diatomologica 37:1-469.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Encyonopsis subspicula CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Encyonopsis subspicula has been collected from five small lakes, ponds and fens in northwest Montana, where it occurs in low numbers. All of these waters are somewhat acidic (pH 6.0–6.5) with low specific conductance (10–150 µS/cm). The type locality of this species is Bemis Lake in the White Mountains of New Hampshire (Krammer 1997).


Drosera Pond, Indian Meadows Research Natural Area, Helena National Forest, Montana: home of Encyonopsis subspicula.

Credit/Source: Loren Bahls