Frankovich, T.
(2022).
Guinardia.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/guinardia?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Centric
Guinardia
Frustules lightly-silicified
Cells joined in chain-like colonies
Valves with shallow mantle
Copulae numerous, ligulate
Frustules are joined in colonies to form straight or curved chains. The connection between frustules is weak and formed by joining of the external process of a rimoportula with a depression on the valve face of the adjacent frustule. Valves are circular, with very shallow mantles and numerous ligulate copulae. The length of the pervalvar...