(W. Smith) Lange-Bertalot in Lange-Bertalot & Metzeltin 1996 Category: Symmetrical biraphid
BASIONYM: Navicula scutelloides W. Smith 1856
Contributor: Marina Potapova - April 2011
Length Range: 13-24 µm
Striae in 10 µm:
Valves are elliptical. The axial area is linear; the central area is small, elliptical. The raphe is filiform with expanded external proximal ends. The terminal raphe fissures are small. The striae are strongly radiate and coarsely punctate. Long and short striae alternate in the central area. The stria density increases towards the apices. Areolae are elliptical and number 10-14 in 10 μm.
Basionym: Navicula scutelloides
Author: W. Smith 1856
Length Range: µm
Striae in 10 µm:
Navicula Scutelloides, W.Sm. Valve nearly orbicular ; striæ moniliform, 18 in •001”. Length of F. •007”. Breadth of •0006”. v.v. W. Sm. In Greg. Mic. Journ. vol. iv. P. 4. pl. i. 15. Fresh water. Ormesby, Norfolk, Sept. 1853, Mr. Bridgman. Rosthern Mere, Cheshire, Sept. 1855, Dr. Arnott. Cantyre Peat, &c.
Gregory, W. (1856). Notice of some new species of British Fresh-water Diatomaceae. Quarterly Journal of Microscopical Science, new series, London 4:1-14, pl. I.
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.
Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.