Staurosirella pinnata has elliptic and wider valves with shorter lengths. Staurosira construens var. venter has lanceolate valves with acute apices, higher striae density, and a wide axial area. Pseudostaurosira elliptica and P. brevistriata both have a higher stria densities and broad, lanceolate axial areas. Staurosirella ansata has clavate and wider valves with stria that are radiate (Hohn and Hellerman 1963).