Spaulding, S.,
Metzeltin, D.
(2011).
Rhopalodia.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/rhopalodia?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Epithemioid
Rhopalodia
Symmetry dorsiventral
Raphe positioned in dorsal keel
Valve faces nearly planar
Frustules of Rhopalodia have a strong dorsiventral symmetry. The raphe is positioned on the dorsal side of each valve in a shallow keel. The valve faces are nearly planar, that is, each frustule is shaped like 1/2 of an orange. The central endings of the raphe are expanded. The raphe is supported internally by costae. In contrast to...