 Stephanopyxis turris |
 Stictodiscus californicus var nankoorensis |
 Stictodiscus harrisonianus |
 Stictodiscus parallelus |
 Stictodiscus parallelus |
 Stictodiscus parallelus |
 Stictodiscus parallelus |
 Stictodiscus parallelus |
 Stictodiscus parallelus fo hexagona |
 Stictodiscus parallelus fo hexagona |
 Stictodiscus parallelus fo hexagona |
 Striatella |
 Striatella |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Striatella unipunctata |
 Strobilidium |
 Strobilidium |
 Strobilidium |
 Strobilidium |
 Strombidium |
 Strombidium |
 Strombidium |
 Subsilicea |
 Subsilicea fragilarioides |
 Subsilicea fragilarioides |
 Subsilicea fragilarioides |
 Subsilicea fragilarioides |
 Surirella |
 Surirella biseriata var bifrons |
 Surirella braunii |
 Surirella comis |
 Surirella elegans |
 Surirella eximia |