Thalassiosira weissflogii

(Grunow) Fryxell and Hasle 1977      Category: Centric
BASIONYM: Micropodiscus weissflogii Grunow in Van Heurck 1880
SYNONYM(S): Eupodiscus weissflogii Grunow in Van Heurck 1882-1885 | Conticribra weissflogii  (Grunow) Stachura-Suchoples and Williams 2009 

Thalassiosira lacustris


Tryblionella apiculata

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - March 2011
Diameter: 10-20 µm
Rows of areolae in 10 µm:


Valves are round, flat, with short mantles. The frustules are relatively lightly silicified. Areolae are fine and details of their structure are not visible with the light microscope. A ring of marginal fultoportulae, with small external openings, are present. Three to six central fultoportulae are present near the center of the valve face. A single, prominent rimoportula is present on the margin of the valve.

Original Description

Basionym: Micropodiscus weissflogii
Author: Grunow in Van Heurck 1880
Diameter: µm
Rows of areolae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Thalassiosira weissflogii. In Diatoms of the United States. Retrieved September 28, 2016, from

Species: Thalassiosira weissflogii

Contributor: Pat Kociolek

Reviewer: Sam Rushforth


Hasle, G.R. and Fryxell, G.A. (1977). The genus Thalassiosira: some species with a linear areola array. In: R. Simonsen (ed.), Proceedings of the Fourth Symposium on Recent and Fossil Marine Diatoms, Oslo, 1976. Beihefte zur Nova Hedwigia 54:15-66.

Stachura-Suchoples, K. and Williams, D.M. (2009). Description of Conticribra tricircularis, a new genus and species of Thalassiosirales, with a discussion on its relationship to other continuous cribra species of Thalassiosira Cleve (Bacillariophyta) and its freshwater origin. European Journal of Phycology, 44(4): 477-486. 10.1080/09670260903225431

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Thalassiosira weissflogii CAS

NCBI Genbank Taxonomy

Thalassiosira weissflogii NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 70008

Autecology Discussion

Thalassiosira weissflogii is a planktonic diatom which commonly forms chains of widely spaced cells.