Thalassiosira lacustris
(Grunow) Hasle 1977 Category: Centric
BASIONYM: Coscinodiscus lacustris Grunow in Cleve & Grunow 1880
SYNONYM(S): Cyclotella punctata W. Smith 1856 | Stephanodiscus punctatus (W. Smith) Grunow 1878
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 13-32 µm
Striae in 10 µm:
Description
Valves are rounded and tangentially undulate on the valve face. Areolae are rectangular to irregular in shape and organized into radial rows of coarse striae that may appear slightly disorganized. A ring of marginal fultoportulae is present. These fultoportulae have external tubes, giving the impression of a ring of short spines around the valve periphery. A prominent rimoportula is present on the valve face, close to the margin.
Original Description
Basionym: Coscinodiscus lacustris
Author: Grunow in Cleve & Grunow 1880
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P. (2011). Thalassiosira lacustris . In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/thalassiosira_lacustris
Species: Thalassiosira lacustris
Contributor: Pat Kociolek
Reviewer: Sam Rushforth
Image Credit: Pat Kociolek
- Valve faces tangentially undulate
- Striae coarse
- Several marginal fultoportulae present
- Single marginal rimoportula present
The valve face is tangentially undulate. Striae are coarse and organized into somewhat radial rows. A ring of marginal fultoportulae is present. A prominent rimoportula is present on the valve face, close to the margin.
Compare
This species is separated from T. weissflogii by the coarse striae, and distinctly tangentially undulate valves.
Thalassiosira weissflogii
Citations
Germain, H. (1981). Flore des diatomées - Diatomophycées- eaux douces et saumâtres du Massif Armoricain et des contrées voisines d'Europe occidentale. Collection "Faunes et Flores Actuelles". Société Nouvelle des Editions Boubée, Paris. 444 pp.
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.
Hasle, G.R. and Lange, C.R. (1989). Freshwater and brackish water Thalassiosira (Bacillariophyceae): taxa with tangentially undulated valves. Phycologia 28:120-135.
Smucker, N.J., Edlund, M.B. and Vis, M.L. (2008). The distribution, morphology and ecology of a non-native species, Thalassiosira lacustris (Bacillariophyceae), from benthic stream habitats in North America. Nova Hedwigia 87: 201-220.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: