Marine Biology (2+1)

4.Genus: Guinardia - Diatom

                                                                                 

4.Genus: Guinardia

Guinardia striata, G. delicatula

Order: Biddulphiales

Family: Rhizosoleniaceae

Description: Cylindrical cells that form straight, 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 = 6-45 µm, Length = 250µm

Distribution: Neritic, widespread, probably cosmopolitan.

Synonym: Rhizosolenia stolterfothii