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Image from type material.
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Lardero, La Rioja, Spain
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Pera, Faro, Portugal
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Miranda do Douro, Bragana, Portugal
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Miranda do Douro, Bragana, Portugal
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Pra, Faro, Portugal
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Puras de Villafranca, Castille and Leon, Spain
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El Palacio De Donana, Andalusia, Spain
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Miranda do Douro, Bragana, Portugal
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Image from type material.
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Chiclana, Andalusia, Spain
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Image from type material.
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Chiclana, Andalusia, Spain
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Prejano, La Rioja, Spain
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Luanco, Asturias, Spain
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Campillos, Andaluca, Espaa
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Miranda do Douro, Bragana, Portugal
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Miranda do Douro, Bragana, Portugal
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Gyrosigma (gyre-o-sig-ma), this is a pennate diatom, and this detail shows the pattern of striae (holes) on the frustule. This square packed pattern to either side of the raphe allows this genus to be distinguished from the superficially similar Pleurosigma. Differential interference contrast.
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Gyrosigma observed in freshwater sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.
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Gyrosigma observed in freshwater sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.