Guide to Staurosirella leptostauron

Valves of S. leptostauron are cruciform with rounded ends. Striae are wide, formed by lineolate striae. Costae are narrower than striae. Spines are flat near the base, and spatulate toward the ends. Spines are solid and positioned on the costae. Two distinct porefields are present at each apex. Girdle bands are closed and lack perforations; the valvocopulum (first girdle band) is wider than other girdle elements and bears fimbriae.