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| NAS - Nonindigenous Aquatic Species |
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Common Name: diatom
Synonyms and Other Names: Coscinodiscus lacustris
Taxonomy: available through 
Identification:
This often highly silicified diatom exhibits tangentially undulate valves and usually contains a few disc-shaped chromatophores. There is one labiate process. Polygonal areolae may occur in the central region and towards the edges of the valve face in irregular rows, with siliceous raised costae between them in the central area. There is typically a ring of more or less regularly spaced processes around the margins of the valve face. Processes typically exhibit dentate external protrusions. The number of central fultoportulae may decrease with decreasing valve diameter (John 1983; Hasle and Lange 1989; Kiss et al. 2002; Smucker et al. 2006).
The diameter of T. lacustris varies from around 10–75 µm (John 1983; Hasle and Lange 1989; Kiss et al. 2002). In streams in southeastern Ohio diameter only reaches up to around 34 µm (Smucker et al. 2006).
Size: Diameter <75 microns
Native Range:
Unclear. T. lacustris is widespread. It has been recorded from the Pacific and Atlantic Oceans on coasts of Europe, North America, and Japan; in inland rivers, lakes, and canals in parts of Europe and North America; in the Baltic Sea; in the Caspian Sea; and in Australian waters (Hasle 1978; John 1983; Mills et al. 1993; Joosten 1997).
Nonindigenous Occurrences: T. lacustris was recorded for the first time in the 1970s in Lake Erie (Millie and Lowe 1981; Mills et al. 1993).
Ecology: T. lacustris occurs around the world in waters of varying salinity, including fresh, brackish, and marine habitats. It is most typically found in marine coastal regions, estuaries, and rivers (John 1983; Hasle and Lange 1989). In one unique case researchers have recorded it as an epilithic species in riffle habitats of shallow streams near the Ohio River in Ohio (Smucker et al. 2006). T. lacustris produces one egg per oogonium. It produces auxospores and spermatogenesis is mergenous (Chepurnov et al. 2006).
Means of Introduction: T. lacustris was very likely introduced to the Great Lakes basin in ballast water (Mills et al. 1993).
Status: Established where recorded.
Impact of Introduction: Unknown.
Remarks: T. lacustris is synonymous with Coscinodiscus lacustris and is often confused with T. bramaputrae.
References
Chepurnov, V. A., D. G. Mann, P. von Dassow, E. V. Armburst, K. Sabbe, R. Dasseville, and W. Vyverman. 2006. Oogamous reproduction, with two-step auxosporulation, in the centric diatom Thalassiosira punctigera (Bacillariophyta). Journal of Phycology 42(4):845-858.
Hasle, G. R. 1978. Some fresh water and brackish water species of the diatom genus Thalassiosira. Phycologia 17(3):263-292.
Hasle, G. R. and C. B. Lange. 1989. Freshwater and brackish water Thalassiosira (Bacillariophyceae) taxa with tangentially undulated valves. Phycologia 28(1):120-135.
John, J. 1983. Observations on Thalassiosira lacustris (Grunow) Hasle populations from Western Australia. Nova Hedwigia 38:323-338.
Joosten, A. M. T. 1997. Some freshwater and brackish water Thalassiosira-species (Bacillariophyceae) from The Netherlands and Germany. Phycologia 36(4 suppl.):44.
Kiss, K. T., R. Iserentant, E. Acs, and L. Ector. 2002. Thalassiosira gessneri Hustedt and T. lacustris (Grunow) Hasle in the rivers Moselle (Luxembourg), Rhone, Saone (France), Danube (Hungary) and the channel Main-Danube (Germany). Archiv fur Hydrobiologie Supplement-band, Algological Studies 145:17-37.
Millie, D. F. and R. L. Lowe. 1981. Diatoms new to Ohio and the Laurentian Great Lakes. Ohio Journal of Science 81(5):195-206.
Mills, E. L., J. H. Leach, J. T. Carlton, and C. L. Secor. 1993. Exotic species in the Great Lakes: a history of biotic crises and anthropogenic introductions. Journal of Great Lakes Research 19(1):1-54.
Smucker, N. J., M. B. Edlund, and M. L. Vis. 2006. Morphology and distribution of Thalassiosira lacustris (Grunow) Hasle: an exotic diatom in southeastern Ohio streams. Journal of Phycology 42(suppl. 1):35.
Author: Rebekah M. Kipp
Contributing Agencies: 
NOAA - GLERL
Revision Date: 8/9/2007 Citation for this information:
Rebekah M. Kipp. 2009. Thalassiosira lacustris. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=1691> Revision Date: 8/9/2007
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