Cymbella blinnii

Bahls 2014      Category: Asymmetrical biraphid

Cymbella aspera

 

Cymbella compacta

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - June 2016
Length Range: 22-54 µm
Width Range: 7.6-11.4 µm
Striae in 10 µm: 10-14 at the valve center, 14-15 near the apices

Description

Valves are dorsiventral with rounded, weakly protracted apices. The dorsal margin is moderately arched. The ventral margin is concave with a gibbous central valve. The axial area is narrow and located just ventral of the apical axis. The central area is asymmetric and rounded, about one-third to one-half the valve width. The raphe is lateral, becoming filiform toward the proximal and distal ends. Proximal raphe ends are deflected ventrally and terminate in tear-shaped pores. Terminal raphe fissures are deflected dorsally. Striae are finely punctate and weakly radiate, becoming more strongly radiate near the apices. One to 5 isolated stigmata are located on the ventral side of the central nodule. Areolae number 22-30 in 10 μm.



Original Description

Basionym:
Author: Bahls 2014
Length Range: 22.8-51.6 µm
Width Range: 8.2-11.4 µm
Striae in 10 µm: 11-14 at the valve center, 14-15 at the apices

Original Description

Valves are dorsiventral with rounded apices and moderately arched dorsal margins. Ventral margins are slightly concave with tumid centers in larger valves. Smaller valves have slightly convex ventral margins and weakly protracted apices. Valve length 22.8-51.6 μm; valve width 8.2-11.4 μm. Axial area is narrow and positioned just ventral of the apical axis. The central area is asymmetric and rounded, about one-third to one-half the valve width. The raphe is lateral. Proximal raphe ends are deflected ventrally and tipped with tear-shaped pores. Terminal raphe fissures are deflected dorsally. Striae are finely punctate and weakly radiate, becoming more strongly radiate near the apices. One to 5 isolated stigmata occur on the ventral side of the central nodule. Striae number 11- 14 in 10 μm at valve center to 14-15 in 10 μm at the apices (dorsal and ventral). Areolae number 25-30 in 10 μm.

Original Images


Cite This Page:
Bahls, L. (2016). Cymbella blinnii. In Diatoms of the United States. Retrieved October 20, 2017, from http://westerndiatoms.colorado.edu/taxa/species/cymbella_blinnii

Species: Cymbella blinnii

Contributor: Loren Bahls

Reviewer: Rex Lowe, Ian Bishop

Citations

Bahls, L. (2014). New diatoms from the American West–A tribute to citizen science. Proceedings of the Academy of Natural Sciences of Philadelphia 163: 61-84.

Krammer, K. (2002). The genus Cymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 3: 1-584.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Cymbella blinnii has been recorded from alpine lakes in the Rocky Mountains, in Colorado and Montana (photo below).

Images

Bullhead Lake, Glacier National Park, Montana: home of Cymbella blinnii.

Credit/Source: Loren Bahls