Proximal raphe
The terminus of the two raphe branches near the center of the valve. The proximal raphe ends border the central nodule.
Image Credit: Sarah Spaulding
This image is a scanning electron micrograph. The two arrows show the external proximal raphe ends in a species of Gomphonema. The external proximal raphe is straight - it is not deflected or dilated.
Image Credit: Josh Stepanek
A light micrograph of a species in the genus Amphora. The two arrows show the proximal raphe ends; the ends are dorsally deflected.
Image Credit: Sarah Spaulding
Here, a scanning electron micrograph shows the external proximal raphe ends in the genus Muelleria. The ends are unilaterally deflected, or bent to the same side of the valve.