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