Pseudoseptum

Proximal raphe

 

Pyrenoid

A plate, or lamina, of silica projecting internally from the apical portion of the valve. Pseudoseptae are found in some species of Gomphonema, Gomphoneis, Stauroneis, and Navicula. Pseudoseptae are part of the valve, while septae are part of the copulae, or girdle bands.

Image Credit: Sarah Spaulding

This image shows a scanning electron micrograph of Gomphonema, showing an internal view of the valve. The pseudo septum is the portion of silica that extends from the valve mantle to towards the interior of the valve.