State: Valve view

schematic

Description
Face presented when looking down onto the surface of the valve. Outlines tend to be rounded, rather than angular.

State: Girdle view

schematic

Description
Faces presented when viewing diatom from the side. Mantle and girdle bands may be seen. In intact cells, the junction between the two valves should also be visible. Outlines tend to be angular, rather than rounded.