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Shape in valve view
Description
Outline of the valve, when seen from above (i.e. "valve view").
State: Circular
Cyclotella radiosa |
Description
At least one plane of radial symmetry
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State: Elliptical or elongated
Gomphonema acuminatum |
Description
At least one plane of longitudinal symmetry
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State: Triradiate
Valve view Centronella reicheltii |
Description
Three distinct poles. Includes both centric diatoms (though none are found in British or Irish freshwaters) and pennate diatoms
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State: Multi-angled
Hydrosera triquetra |
Description
More than three distinct poles. None are found in British or Irish freshwaters. None are included in this key although Hydrosera is found in estuaries.
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