Distal raphe

The portion of a raphe branch that is near the valve end, or valve apex. See also proximal raphe.

Encyonema Distal
Image Credit: Sarah Spaulding
Light micrograph of the valve apex of a species in the genus Encyonema. The arrow indicates the distal raphe, which is ventrally deflected.
Diploneis Distal Raphe
Image Credit: Ditmar Metzeltin
Scanning electron micrograph of a member of Diploneis. The two arrows show the distal raphe ends, which are unilaterally (to the same side) deflected.