Guinardia delicatula

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Taxonomic Group:Diatom
Trophic Status:Autotrophic
Size Range:11.4-17.5 μm wide x 24.7-45 μm long (LUMCON Guide); 9-16 μm wide (Cupp 1943); 9-22 μm wide (Horner 2002, Tomas 1997)
Key Characteristics:Cells cylindrical with flat valves that are only slightly rounded at the edges; united in closely set straight chains; spine on valve margin is thin and sharp-looking, fitting into depression on adjacent cell; generally two large chloroplasts
Confused With:Dactyliosolen fragilissimus and Cerataulina pelagica, which are similar in size and shape, but close examination of a terminal cell will reveal a longer, sharper spine, as compared to a small spine in the center of the valve on D. fragilissimus and two marginal horns on C. pelagica
Toxin:None known