Mastogloia smithii

Thwaites 1856      Category: Symmetrical biraphid
BASIONYM: Mastogloia smithii Thwaites 1856

Mastogloia pumila


Melosira undulata

LM scalebar = 10 µm = 80 pixels.


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.

Original Description

Basionym: Mastogloia smithii
Author: Thwaites 1856
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Mastogloia smithii. In Diatoms of the United States. Retrieved May 23, 2016, from

Species: Mastogloia smithii

Contributor: Pat Kociolek

Reviewer: Sarah Spaulding


Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Mastogloia smithii CAS

North American Diatom Ecological Database (NADED)

NADED ID: 43002

Autecology Discussion