Spaulding, S.,
Edlund, M.
(2008).
Frustulia.
In Diatoms of North America.
Retrieved November 17, 2024, from https://diatoms.org/genera/frustulia
Symmetric Biraphid
Frustulia
Valve with distinct median longitudinal ribs
Ribs form a single tip at valve ends
Raphe present between longitudinal ribs
Striae fine, punctate, forming transapical and longitudinal rows
Frustulia valves are rhomboid to linear-lanceolate with straight to undulate margins. The striae are composed of fine areolae, arranged into patterns that appear to form both apical and transapical rows.The genus possesses distinct median, longitudinal ribs that extend most of the length of the valve. The raphe is located between the...