Mastogloia lacustris

(Grunow) Van Heurck 1880      Category: Symmetrical biraphid
BASIONYM: Mastogloia smithii var. lacustris Grunow 1878

Mastogloia grevillei


Mastogloia pseudosmithii

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - March 2011
Length Range: 30-54 µm
Width Range: 8-10 µm
Striae in 10 µm: 15-17


Valves are linear-lanceolate with margins slightly convex to nearly straight and apices bluntly produced. The axial area is straight, narrow and expanded to form an asymmetric, elliptic to nearly rectangular central area. The raphe is straight and filiform, becoming lateral at about ½ the way between the apex and central area. External proximal raphe ends are enlarged. Striae are distinctly punctate and radiate, except at the apices where they are parallel.

Co-occurs with the nominate variety in alkaline, lentic habitats.

Original Description

Basionym: Mastogloia smithii var. lacustris
Author: Grunow 1878
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Mastogloia lacustris. In Diatoms of the United States. Retrieved August 31, 2016, from

Species: Mastogloia lacustris

Contributor: Pat Kociolek

Reviewer: Sarah Spaulding


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

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Mastogloia lacustris CAS

North American Diatom Ecological Database (NADED)

NADED ID: 43004

Autecology Discussion


- Change in rank

This taxon was reported here as M. smithii var. lacustris Grunow until this date. The publication, Lee et al. 2014, documents that M. smithii var. lacustris Grunow is recognized at the rank of species as M. lacustris (Grunow) Van Heurck and it is now updated, with approval of P. Kociolek. - S. Spaulding