Diatoms, Freshwater
The following Web sources may be useful for additional data on freshwater diatoms:
River Diatoms of the UK and Ireland
(This site includes photographs and environmental tolerances for each species)
US Freshwater Diatoms by Shape
(This site is photographically keyed and includes photographs and some environmental data for each species)
US Freshwater Genera Guide
(This site includes photographs and some environmental information for each species)
Centrales
Pennales
Diatoms, Marine
The following Web sources may be useful for additional data on marine diatoms:
Marine Diatoms of the West Coast of North America
(This is a downloadable PDF on the preparation and identification of marine diatoms)
Centrales
Pennales
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