Eunotia, Ehrenberg, 1837

Furey, Paula C., Manoylov, Kalina M. & Lowe, Rex L., 2020, New and interesting aerial diatom assemblages from southwestern Iceland, Phytotaxa 428 (3), pp. 173-208 : 195

Other Eunotia

Other, less common (<5% relative abundance), Eunotia taxa present included E. cf. valida Hustedt (1930: 178) ( Fig. 4 N ) and E. nymanniana ( Fig. 4 X – c ), both listed from aerial habitats in the Hallgrímsson (2007) checklist. Observation of more valves of E. cf. fallax Cleve (1895: 33) ( Fig. 4 O, P ) would help confirm this taxon (length 22–25 μm, width 2.5–2.8 μm, and 16–18 striae in 10 μm).

Figures

FIGURE 4. Light (A–I, N–c) and SEM (J–M) images of aerial diatom assemblages from southwestern Iceland, Eunotia species. A–F, J–L. Eunotia palatina: A–F. size diminution series, the striae end short on the valve face to create the appearance of a hyaline strip (i), J. internal views of a valve apex showing the location of the helictoglossa, a hyaline area (i) and swelling where the proximal raphe ends (ii), K. a whole valve, internal view (scale bar as in L), and L. a frustule with both valve and girdle views visible; G–I, M. Eunotia arctica: G–I. valve views, M. external view shows striae and hyaline band along the ventral edge; N. Eunotia cf. valida: valve view; O–P. Eunotia cf. fallax: valve view; Q–W. Eunotia neofallax: valve view, V. half valve / half girdle view, and W. girdle view; X–c. Eunotia nymanniana: valve view. LM scale bar = 10 μm, SEM scale bars as shown.