Pavlov et al. 2016 Category: Symmetrical biraphid
BASIONYM: Mastogloia smithii var. amphicephala Grunow in Van Heurck 1880
REPORTED AS: Mastogloia smithii (Diatoms of the United States) | Mastogloia aff. smithii 2 (Lee et al. 2014)
Contributor: Pat Kociolek - March 2011
Length Range: 33-46 µm
Width Range: 11-13 µm
Striae in 10 µm: 15-18
Valves are elliptic-lanceolate with mostly convex sides and protracted, broadly rounded apices. The axial area is narrow, straight, and expanded into an asymmetric, elliptic to irregularly rectangular central area. The raphe is filiform, but becomes lateral at about ½ from the apices to the center. External proximal raphe ends are dilated slightly and rounded. Striae are radiate and distinctly punctate.
Valvocopulae with locules that are rectangular to irregularly-shaped chamber, present in the middle section of the band. Locules number 6-9 in 10 µm. This taxon is found in alkaline, usually standing, waters.
Basionym: Mastogloia smithii var. amphicephala
Author: Grunow in Van Heurck 1880
Length Range: µm
Striae in 10 µm:
Lee S.S., Gaiser E.E., Van de Vijver, B., Edlund, M.B., and Spaulding, S.A. (2014). Morphology and typification of Mastogloia smithii and M. lacustris, with descriptions of two new species from the Florida Everglades and the Caribbean region. Diatom Research. doi:10.1080/0269249X.2014.889038
Pavlov, P., Jovanovska, J., Wetzel, C.E., Ector, L. and Levkov, Z. (2016). Freshwater Mastogloia (Bacillariophyceae) taxa from Macedonia, with a description of the epizoic M. sterijovskii sp. nov. Diatom Research. 10.1080/0269249X.2016.1157376
Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.
From March 2011 until 1 June 2016, the specimens illustrated here appeared under the name Mastogloia smithii Thwaites 1856. Recent work, however, showed that the specimens shown on the page were not of the type. Lee et al. (2014) examined type material of M. smithii and determined that specimens shown on Diatoms of the US differed in valve outline, differed by absence of axial costae, and had a lower stria density. The specimens on the page do conform to the type of M. smithii var. amphicephala. This name was recently elevated to the rank of species, as Mastogloia albertii Pavlov et al. 2016.
Note that, with this correction, M. smithii has NOT been verified in North America. - S. Spaulding