Spaulding, S.,
Edlund, M.
(2008).
Meridion.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/meridion?x-craft-preview=cab8b13ef68d1e257235fd2491770f51dfe0c9a6c0ad3b95411776e5316d603alxhbyabypv
Araphid
Meridion
Valve symmetry to the transverse axis variable
Frustules linear to wedge-shaped in girdle view
Frustules may be joined in colonies
Costae present
Valves of Meridion are variable in symmetry to the transverse axis; they are either strongly heteropolar or isopolar. The heteropolar species are clavate (club-shaped) in valve view and wedge-shaped in girdle view. Septae (attached to girdle elements) are present. An apical porefield is present at one end. Valves may have 1-2...