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Diatoma
Diatoma have thick glass cell walls with deep grooves which may appear less parallel than those in other genuses. These grooves are not made of striae, but are instead called "transapical ribs,"which give the genus its distinct look.
D. tenuis
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Cells are 20-85 µm in length, 3-5 µm in width.
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Transapical ribs are 6-11 per 10 µm.
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In valve view, rounded bulb ends. In girdle view, ends flare and are flat.
For more information, visit diatoms.org here.
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Valve view:
A5m1 Diatoma tenuis_edited
Diatoma tenuis_edited
A1m1 Diatoma tenuis valve view_edited_edited
A5m1 Diatoma elongatum)1_edited
Girdle view:
A1m1 Diatoma elongatum_edited
A1m1 Diatoma elongatum side view_edited
A5m1 Diatoma elongatum (_)_edited
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