Species: Guinardia striata| Diatom

Order: Biddulphiales
Family: Rhizosoleniaceae

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Description: Cylindrical cells that form curving and sometimes spiraling chains. Valves flat but with rounded edges. External process is marginal, and fits into a shallow depression in adjoining valve. Girdle bands appear as collars but hard to see. Small numerous chloroplasts.

Cell Size: Width = 6-45um, Length = 250um

Distribution: Neritic, widespread, probably cosmopolitan.

Synonym: Rhizosolenia stolterfothii.