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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Stauroneis phnicenteron Ehr Stauroneis acuta Wm Sm Stauroneis americana Stauroneis anceps var Stauroneis anceps var gracilis Ehr Cl Stauroneis salina Wm Sm Stauroneis anceps var amphicephala Kuetz Cl Stauroneis anceps var Stauroneis anceps var Stauroneis crucicula