Eunotia canicula
Furey, Lowe and Johansen 2011 Category: Eunotioid
BASIONYM: Eunotia canicula Furey, Lowe and Johansen 2011
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Paula Furey - March 2011
Length Range: 20-35 µm
Width Range: 3.5-4.0 µm
Striae in 10 µm: 14-15, areolae >35
Description
Valves are straight to weakly concave on the ventral margin. The valve mantle is thickened at the proximal raphe ends. The dorsal margin is convex. The apices are acutely rounded, tapered, subrostrate, slightly delimited by a change in the slope of the dorsal margin, and appear nose-like. Each helictoglossa is equidistant from the midpoint of the apical axis and the apex. The helictoglossae are "set in" forming an indentation on the ventral margin. The distal raphe ends curve onto the valve surface. Striae are slightly radiate.
Original Description
Basionym: Eunotia canicula
Author: Furey, Lowe and Johansen 2011
Length Range: 20-35 µm
Width Range: 3.5-4.0 µm
Striae in 10 µm: 14-15, puncta >35
Original Description
Valves straight to weakly concave on the ventral margin, with valve mantle thickened at the proximal raphe ends, convex on the dorsal margin, 20 – 35 μm long, 3.5 – 4.0 μm wide. Apices acutely rounded, tapered, subrostrate, slightly delimited by a change in the slope of the dorsal margin, appearing nose-like. Helictoglossae set in from ends, equidistant from each end, giving appearance of an indentation in the light microscope. Rimoportula at one end, at the center of the apex. Raphe with distal ends curved onto the valve surface. Striae slightly radiate, 14 – 15 in 10 μm. Puncta >35 in 10 μm.
Original Images
Cite This Page:
Furey, P. (2011). Eunotia canicula. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_canicula
Species: Eunotia canicula
Contributor: Paula Furey
Reviewer: Rex Lowe
Image Credit: Paula Furey
- Ventral margin straight to weakly concave
- Dorsal margin convex
- Apices acutely rounded and nose-like
- Helictoglossae equidistant from midpoint of apical axis and apices
The ventral margin of Eunotia canicula is straight to weakly concave. The dorsal margin is convex. The apices are acutely rounded, tapered, subrostrate and nose-like in appearance. The apices are delimited by a very slight change in the slope of the dorsal margin. Helictoglossae are equidistant from the midpoint of the apical axis and the ends.The helictoglossae are also set in, forming a ventral indentation. Striae are slightly radiate.
Compare
Eunotia canicula is similar to E. incisa and the size range of the two species overlap. The apices of E. incisa, however, are more inset (more like a snout, or nose) than the apices of E. canicula. Furthermore, the valves of E. canicula are more narrow and the helicotoglossae are closer to the apex (less inset) as compared to E. incisa.
Eunotia incisa
W. Smith ex Gregory
Citations
Furey, P.C., Lowe, R.L. and Johansen, J.R. (2011). Eunotia Ehrenberg (Bacillariophyta) of the Great Smoky Mountains National Park, USA. Bibliotheca Diatomologica 56: 1-134.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
To date Eunotia canicula has been found epiphytic on bryophyte substrates in streams throughout the Great Smoky Mountains National Park.
Images
Type locality: Noland Creek in the Noland Creek watershed. Great Smoky Mountains National Park, Swain County, North Carolina
Credit/Source: Paula C. Furey