W. Smith 1856 Category: Symmetrical biraphid
BASIONYM: Mastogloia grevillei W. Smith in Gregory 1856
SYNONYM(S): Mastogloia smithii var. grevillei (W. Smith) Brun 1880
Contributor: Pat Kociolek - March 2011
Length Range: 25-45 µm
Width Range: 9-11 µm
Striae in 10 µm: 8-10
Valves are linear-lanceolate with straight margins and protracted and rounded apices. The axial area is narrow at the apices, slightly wider until reaching the rounded central area. The raphe is lateral, reverse lateral about midway from the apices to the central area. The external proximal raphe ends are dilated slightly. Striae are radiate and composed of two rows of areolas arranged in quincunx.
Found in alkaline freshwaters across the US.
Basionym: Mastogloia grevillei
Author: W. Smith in Gregory 1856
Length Range: µm
Striae in 10 µm:
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.
Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.