Eunotia horstii

Furey, Lowe and Johansen 2011      Category: Eunotioid
BASIONYM: Eunotia horstii Furey, Lowe and Johansen 2011

Eunotia hexaglyphis

 

Eunotia incisa

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Paula Furey - March 2011
Length Range: 18-33 µm
Width Range: 2.8-3.3 µm
Striae in 10 µm: 13-17 in the valve center, 18-22 at the ends, areolae unresolved in LM

Description

The ventral margin is only slightly concave to nearly straight. The dorsal margin is convex. The apices are rostrate, dorsally deflected and set off by a change in slope of the dorsal margin. The helictoglossae are visible in the LM. The distal raphe ends curve dorsally. Striae are parallel. The areolae are unresolved in the LM.

Eunotia horstii valves are similar to E. gracillima valves (Lange-Bertalot et al. 1996, Plate 57: Figs 22 – 47) but E. horstii valves are broader and have denser striae. Eunotia horstii valves have similar measurements to E. groenlandica but the ends E. horstii valves are more recurved than those of E. groenlandica (Lange-Bertalot & Metzeltin 1996, Taf. 17: Figs 25 – 27; Lange-Bertalot & Genkal 1999, Taf. 6: Figs 3 – 9). Eunotia horstii is also similar to E. fallax but E. horstii has consistently spaced striae relative to E. fallax, especially in the central area of the valve.



Original Description

Basionym: Eunotia horstii
Author: Furey, Lowe and Johansen 2011
Length Range: 18-33 µm
Width Range: 2.8-3.3 µm
Striae in 10 µm: 13-17 in the valve center, 18-22 at the ends, puncta unresolved in LM

Original Description

Valves only slightly concave to nearly straight on ventral margin, convex on dorsal margin, with apices set off by a change in slope of the dorsal margin, 18 – 33 μm long, 2.8 – 3.3 μm wide. Apices rostrate, dorsally deflected. Helictoglossae visible in the light microscope. Rimoportula at one end of valve, at the center of the apex. Raphe with distal ends dorsally curved. Striae parallel, 13 – 17 in 10 μm in the valve center, 18 – 22 in 10 μm near the apices. Puncta unresolved in the light microscope.

Original Images


Cite This Page:
Furey, P. (2011). Eunotia horstii. In Diatoms of the United States. Retrieved November 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_horstii

Species: Eunotia horstii

Contributor: Paula Furey

Reviewer: Rex Lowe

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.

Lange-Bertalot, H. and Genkal, S.I. (1999). Diatoms from Siberia I. Islands in the Arctic Ocean (Yugorsky-Shar Strait). Iconographia Diatomologica 6: 1-292.

Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.

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 horstii has been infrequently found from the bryophyte substrates in first and second order streams in the Great Smoky Mountains National Park