Encyonopsis treinishii

Bahls 2013      Category: Asymmetrical biraphid
BASIONYM: Encyonopsis treinishii Bahls 2013

Encyonopsis subspicula

 

Entomoneis alata

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2013
Length Range: 55-80 µm
Width Range: 7.6-10.3 µm
Striae in 10 µm: 12-15 at valve center, 14-17 near the apices

Description

Valves are rhombic-lanceolate and not or weakly dorsiventral. Apices are subrostrate and broadly rounded. Axial and central areas are relatively wide, together forming a narrow longitudinal lanceolate hyaline area. The raphe is lateral, becoming filiform at the proximal and distal ends. Proximal raphe ends are weakly expanded and deflected dorsally. Distal raphe fissures are comma-shaped, concave toward the ventral margin. Striae are radiate, becoming parallel then convergent toward the apices. Striae near the central area are curved and then recurved near the margin, or sinuous. One, or rarely, two stigmata are present on the dorsal side of the central area.



Original Description

Basionym: Encyonopsis treinishii
Author: Bahls 2013
Length Range: 61.8-79.9 µm
Width Range: 7.9-10.3 µm
Striae in 10 µm: 12-15 at valve center, 14-17 near the apices

Original Description

Valves rhombic-lanceolate, not or slightly dorsiventral. Apices subrostrate, broadly rounded. Valve length 61.8–79.9 µm; valve width 7.9–10.3 µm. Axial and central areas relatively wide, together forming a narrow longitudinal lanceolate space. Raphe lateral, filiform at the proximal and distal ends. Proximal raphe ends weakly expanded, deflected dorsally. Distal raphe fissures comma-shaped, concave toward the ventral margin. Striae radiate, becoming parallel then convergent toward the apices, 12–15 in 10 µm at valve center, 14–17 in 10 µm near the apices. Striae near the central area are curved and then recurved (sinuous). A single stigma lies at the proximal end of the median stria on the dorsal side.

Original Images


Cite This Page:
Bahls, L. (2013). Encyonopsis treinishii. In Diatoms of the United States. Retrieved August 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_treinishii

Species: Encyonopsis treinishii

Contributor: Loren Bahls

Reviewer: Pat Kociolek

Citations

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)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Encyonopsis treinishii has been collected from a few small lakes and fens in Montana and Washington. Here pH ranges from 6.02 to 7.24 and specific conductance from 30 to 58 µS/cm.

Images

Nada Lake, Chelan County, Washington: type locality for Encyonopsis treinishii.

Credit/Source: Ryan Davis, Adventurers and Scientists for Conservation.